Binary number

A binary number is a number expressed in the base-2 numeral system or binary numeral system, a method for representing numbers that uses only two symbols for the natural numbers: typically "0" (zero) and "1" (one). A binary number may also refer to a rational number that has a finite representation in the binary numeral system, that is, the quotient of an integer by a power of two.

The base-2 numeral system is a positional notation with a radix of 2. Each digit is referred to as a bit, or binary digit. Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used by almost all modern computers and computer-based devices, as a preferred system of use, over various other human techniques of communication, because of the simplicity of the language and the noise immunity in physical implementation.^[1]

History

The modern binary number system was studied in Europe in the 16th and 17th centuries by Thomas Harriot, Juan Caramuel y Lobkowitz, and Gottfried Leibniz. However, systems related to binary numbers have appeared earlier in multiple cultures including ancient Egypt, China, and India.

Egypt

The scribes of ancient Egypt used two different systems for their fractions, Egyptian fractions(not related to the binary number system) and Horus-Eye fractions (so called because many historians of mathematics believe that the symbols used for this system could be arranged to form the eye of Horus, although this has been disputed).^[2] Horus-Eye fractions are a binary numbering system for fractional quantities of grain, liquids, or other measures, in which a fraction of a hekat is expressed as a sum of the binary fractions 1/2, 1/4, 1/8, 1/16, 1/32, and 1/64. Early forms of this system can be found in documents from the Fifth Dynasty of Egypt, approximately 2400 BC, and its fully developed hieroglyphic form dates to the Nineteenth Dynasty of Egypt, approximately 1200 BC.^[3]

The method used for ancient Egyptian multiplication is also closely related to binary numbers. In this method, multiplying one number by a second is performed by a sequence of steps in which a value (initially the first of the two numbers) is either doubled or has the first number added back into it; the order in which these steps are to be performed is given by the binary representation of the second number. This method can be seen in use, for instance, in the Rhind Mathematical Papyrus, which dates to around 1650 BC.^[4]

China

The I Ching dates from the 9th century BC in China.^[5] The binary notation in the I Ching is used to interpret its quaternary divination technique.^[6]

It is based on taoistic duality of yin and yang.^[7] Eight trigrams (Bagua) and a set of 64 hexagrams ("sixty-four" gua), analogous to the three-bit and six-bit binary numerals, were in use at least as early as the Zhou dynasty of ancient China.^[5]

The Song dynasty scholar Shao Yong (1011–1077) rearranged the hexagrams in a format that resembles modern binary numbers, although he did not intend his arrangement to be used mathematically.^[6] Viewing the least significant bit on top of single hexagrams in Shao Yong's square^[8] and reading along rows either from bottom right to top left with solid lines as 0 and broken lines as 1 or from top left to bottom right with solid lines as 1 and broken lines as 0 hexagrams can be interpreted as sequence from 0 to 63. ^[9]

Classical antiquity

Etruscans divided the outer edge of divination livers into sixteen parts, each inscribed with the name of a divinity and its region of the sky. Each liver region produced a binary reading which was combined into a final binary for divination.^[10]

Divination at Ancient Greek Dodona oracle worked by drawing from separate jars, questions tablets and "yes" and "no" pellets. The result was then combined to make a final prophecy.^[11]

India

The Indian scholar Pingala (c. 2nd century BC) developed a binary system for describing prosody.^[12]^[13] He described meters in the form of short and long syllables (the latter equal in length to two short syllables).^[14] They were known as laghu (light) and guru(heavy) syllables.

Pingala's Hindu classic titled Chandaḥśāstra (8.23) describes the formation of a matrix in order to give a unique value to each meter. "Chandaḥśāstra" literally translates to science of meters in Sanskrit. The binary representations in Pingala's system increases towards the right, and not to the left like in the binary numbers of the modern positional notation.^[15] In Pingala's system, the numbers start from number one, and not zero. Four short syllables "0000" is the first pattern and corresponds to the value one. The numerical value is obtained by adding one to the sum of place values.^[16]

Africa

The Ifá is an African divination system. Similar to the I Ching, but has up to 256 binary signs,^[17] unlike the I Ching which has 64. The Ifá originated in 15th century West Africa among Yoruba people. In 2008, UNESCO added Ifá to its list of the "Masterpieces of the Oral and Intangible Heritage of Humanity".^[18]^[19]

Other cultures

The residents of the island of Mangareva in French Polynesia were using a hybrid binary-decimal system before 1450.^[20] Slit drumswith binary tones are used to encode messages across Africa and Asia.^[7] Sets of binary combinations similar to the I Ching have also been used in traditional African divination systems, such as Ifá among others, as well as in medieval Western geomancy. The majority of Indigenous Australian languages use a base-2 system.^[21]

Western predecessors to Leibniz

In the late 13th century Ramon Llull had the ambition to account for all wisdom in every branch of human knowledge of the time. For that purpose he developed a general method or "Ars generalis" based on binary combinations of a number of simple basic principles or categories, for which he has been considered a predecessor of computing science and artificial intelligence.^[22]

In 1605, Francis Bacon discussed a system whereby letters of the alphabet could be reduced to sequences of binary digits, which could then be encoded as scarcely visible variations in the font in any random text.^[23] Importantly for the general theory of binary encoding, he added that this method could be used with any objects at all: "provided those objects be capable of a twofold difference only; as by Bells, by Trumpets, by Lights and Torches, by the report of Muskets, and any instruments of like nature".^[23] (See Bacon's cipher.)

In 1617, John Napier described a system he called location arithmetic for doing binary calculations using a non-positional representation by letters. Thomas Harriot investigated several positional numbering systems, including binary, but did not publish his results; they were found later among his papers.^[24] Possibly the first publication of the system in Europe was by Juan Caramuel y Lobkowitz, in 1700.^[25]

Leibniz

Leibniz wrote in excess of a hundred manuscripts on binary, most of them remain unpublished. ^[26]Before his first dedicated work in 1679, numerous manuscripts feature early attempts to explore binary concepts, including tables of numbers and basic calculations, often scribbled in the margins of works unrelated to mathematics.^[26]

His first know work on binary, “On the Binary Progression", in 1679, Leibniz introduced conversion between decimal and binary, along with algorithms for performing basic arithmetic operations such as addition, subtraction, multiplication, and division using binary numbers. He also developed a form of binary algebra to calculate the square of a six-digit number and to extract square roots..^[26]

His most well known work appears in his article Explication de l'Arithmétique Binaire (published in 1703). The full title of Leibniz's article is translated into English as the "Explanation of Binary Arithmetic, which uses only the characters 1 and 0, with some remarks on its usefulness, and on the light it throws on the ancient Chinese figures of Fu Xi".^[27] Leibniz's system uses 0 and 1, like the modern binary numeral system. An example of Leibniz's binary numeral system is as follows:^[27]

0 0 0 1 numerical value 2⁰

0 0 1 0 numerical value 2¹

0 1 0 0 numerical value 2²

1 0 0 0 numerical value 2³

While corresponding with the Jesuit priest Joachim Bouvet in 1700, who had made himself an expert on the I Ching while a missionary in China, Leibniz explained his binary notation, and Bouvet demonstrated in his 1701 letters that the I Ching was an independent, parallel invention of binary notation. Leibniz & Bouvet concluded that this mapping was evidence of major Chinese accomplishments in the sort of philosophical mathematics he admired.^[28] Of this parallel invention, Liebniz wrote in his "Explanation Of Binary Arithmetic" that "this restitution of their meaning, after such a great interval of time, will seem all the more curious."^[29]

The relation was a central idea to his universal concept of a language or characteristica universalis, a popular idea that would be followed closely by his successors such as Gottlob Frege and George Boole in forming modern symbolic logic.^[30] Leibniz was first introduced to the I Ching through his contact with the French Jesuit Joachim Bouvet, who visited China in 1685 as a missionary. Leibniz saw the I Ching hexagrams as an affirmation of the universality of his own religious beliefs as a Christian.^[31] Binary numerals were central to Leibniz's theology. He believed that binary numbers were symbolic of the Christian idea of creatio ex nihilo or creation out of nothing.^[32]

[A concept that] is not easy to impart to the pagans, is the creation ex nihilo through God's almighty power. Now one can say that nothing in the world can better present and demonstrate this power than the origin of numbers, as it is presented here through the simple and unadorned presentation of One and Zero or Nothing.
— Leibniz's letter to the Duke of Brunswick attached with the I Ching hexagrams^[31]

Later developments

In 1854, British mathematician George Boole published a landmark paper detailing an algebraic system of logic that would become known as Boolean algebra. His logical calculus was to become instrumental in the design of digital electronic circuitry.^[33]

In 1937, Claude Shannon produced his master's thesis at MIT that implemented Boolean algebra and binary arithmetic using electronic relays and switches for the first time in history. Entitled A Symbolic Analysis of Relay and Switching Circuits, Shannon's thesis essentially founded practical digital circuitdesign.^[34]

In November 1937, George Stibitz, then working at Bell Labs, completed a relay-based computer he dubbed the "Model K" (for "Kitchen", where he had assembled it), which calculated using binary addition.^[35] Bell Labs authorized a full research program in late 1938 with Stibitz at the helm. Their Complex Number Computer, completed 8 January 1940, was able to calculate complex numbers. In a demonstration to the American Mathematical Society conference at Dartmouth College on 11 September 1940, Stibitz was able to send the Complex Number Calculator remote commands over telephone lines by a teletype. It was the first computing machine ever used remotely over a phone line. Some participants of the conference who witnessed the demonstration were John von Neumann, John Mauchly and Norbert Wiener, who wrote about it in his memoirs.^[36]^[37]^[38]

The Z1 computer, which was designed and built by Konrad Zuse between 1935 and 1938, used Boolean logic and binary floating-point numbers.^[39]

Representation

Any number can be represented by a sequence of bits (binary digits), which in turn may be represented by any mechanism capable of being in two mutually exclusive states. Any of the following rows of symbols can be interpreted as the binary numeric value of 667:

1	0	1	0	0	1	1	0	1	1
\|	―	\|	―	―	\|	\|	―	\|	\|
☒	☐	☒	☐	☐	☒	☒	☐	☒	☒
y	n	y	n	n	y	y	n	y	y

The numeric value represented in each case depends on the value assigned to each symbol. In the earlier days of computing, switches, punched holes, and punched paper tapes were used to represent binary values.^[40] In a modern computer, the numeric values may be represented by two different voltages; on a magnetic disk, magnetic polarities may be used. A "positive", "yes", or "on" state is not necessarily equivalent to the numerical value of one; it depends on the architecture in use.

In keeping with the customary representation of numerals using Arabic numerals, binary numbers are commonly written using the symbols 0 and 1. When written, binary numerals are often subscripted, prefixed, or suffixed to indicate their base, or radix. The following notations are equivalent:

100101 binary (explicit statement of format)
100101b (a suffix indicating binary format; also known as Intel convention^[41]^[42])
100101B (a suffix indicating binary format)
bin 100101 (a prefix indicating binary format)
100101₂ (a subscript indicating base-2 (binary) notation)
%100101 (a prefix indicating binary format; also known as Motorola convention^[41]^[42])
0b100101 (a prefix indicating binary format, common in programming languages)
6b100101 (a prefix indicating number of bits in binary format, common in programming languages)
#b100101 (a prefix indicating binary format, common in Lisp programming languages)

When spoken, binary numerals are usually read digit-by-digit, to distinguish them from decimal numerals. For example, the binary numeral 100 is pronounced one zero zero, rather than one hundred, to make its binary nature explicit and for purposes of correctness. Since the binary numeral 100 represents the value four, it would be confusing to refer to the numeral as one hundred (a word that represents a completely different value, or amount). Alternatively, the binary numeral 100 can be read out as "four" (the correct value), but this does not make its binary nature explicit.

Counting in binary

Decimal number	Binary number
0	0
1	1
2	10
3	11
4	100
5	101
6	110
7	111
8	1000
9	1001
10	1010
11	1011
12	1100
13	1101
14	1110
15	1111

Counting in binary is similar to counting in any other number system. Beginning with a single digit, counting proceeds through each symbol, in increasing order. Before examining binary counting, it is useful to briefly discuss the more familiar decimal counting system as a frame of reference.

Decimal counting

Decimal counting uses the ten symbols 0 through 9. Counting begins with the incremental substitution of the least significant digit (rightmost digit) which is often called the first digit. When the available symbols for this position are exhausted, the least significant digit is reset to 0, and the next digit of higher significance (one position to the left) is incremented (overflow), and incremental substitution of the low-order digit resumes. This method of reset and overflow is repeated for each digit of significance. Counting progresses as follows:

000, 001, 002, ... 007, 008, 009, (rightmost digit is reset to zero, and the digit to its left is incremented)

010, 011, 012, ...

...

090, 091, 092, ... 097, 098, 099, (rightmost two digits are reset to zeroes, and next digit is incremented)

100, 101, 102, ...

Binary counting

Binary counting follows the exact same procedure, and again the incremental substitution begins with the least significant binary digit, or bit (the rightmost one, also called the first bit), except that only the two symbols 0 and 1are available. Thus, after a bit reaches 1 in binary, an increment resets it to 0 but also causes an increment of the next bit to the left:

0000,

0001, (rightmost bit starts over, and the next bit is incremented)

0010, 0011, (rightmost two bits start over, and the next bit is incremented)

0100, 0101, 0110, 0111, (rightmost three bits start over, and the next bit is incremented)

1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111 ...

In the binary system, each bit represents an increasing power of 2, with the rightmost bit representing 2⁰, the next representing 2¹, then 2², and so on. The value of a binary number is the sum of the powers of 2 represented by each "1" bit. For example, the binary number 100101 is converted to decimal form as follows:

100101₂ = [ ( 1 ) × 2⁵ ] + [ ( 0 ) × 2⁴ ] + [ ( 0 ) × 2³ ] + [ ( 1 ) × 2² ] + [ ( 0 ) × 2¹ ] + [ ( 1 ) × 2⁰ ]

100101₂ = [ 1 × 32 ] + [ 0 × 16 ] + [ 0 × 8 ] + [ 1 × 4 ] + [ 0 × 2 ] + [ 1 × 1 ]

100101₂ = 37₁₀

Fractions

Fractions in binary arithmetic terminate only if 2 is the only prime factor in the denominator. As a result, 1/10 does not have a finite binary representation (10 has prime factors 2 and 5). This causes 10 × 1/10 not to precisely equal 1 in binary floating-point arithmetic. As an example, to interpret the binary expression for 1/3 = .010101..., this means: 1/3 = 0 × 2⁻¹ + 1 × 2⁻² + 0 × 2⁻³ + 1 × 2⁻⁴ + ... = 0.3125 + ... An exact value cannot be found with a sum of a finite number of inverse powers of two, the zeros and ones in the binary representation of 1/3 alternate forever.

Fraction	Decimal	Binary	Fractional approximation
1/1	1 or 0.999...	1 or 0.1	1/2 + 1/4 + 1/8...
1/2	0.5 or 0.4999...	0.1 or 0.01	1/4 + 1/8 + 1/16 . . .
1/3	0.333...	0.01	1/4 + 1/16 + 1/64 . . .
1/4	0.25 or 0.24999...	0.01 or 0.001	1/8 + 1/16 + 1/32 . . .
1/5	0.2 or 0.1999...	0.0011	1/8 + 1/16 + 1/128 . . .
1/6	0.1666...	0.00101	1/8 + 1/32 + 1/128 . . .
1/7	0.142857142857...	0.001	1/8 + 1/64 + 1/512 . . .
1/8	0.125 or 0.124999...	0.001 or 0.0001	1/16 + 1/32 + 1/64 . . .
1/9	0.111...	0.000111	1/16 + 1/32 + 1/64 . . .
1/10	0.1 or 0.0999...	0.00011	1/16 + 1/32 + 1/256 . . .
1/11	0.090909...	0.0001011101	1/16 + 1/64 + 1/128 . . .
1/12	0.08333...	0.000101	1/16 + 1/64 + 1/256 . . .
1/13	0.076923076923...	0.000100111011	1/16 + 1/128 + 1/256 . . .
1/14	0.0714285714285...	0.0001	1/16 + 1/128 + 1/1024 . . .
1/15	0.0666...	0.0001	1/16 + 1/256 . . .
1/16	0.0625 or 0.0624999...	0.0001 or 0.00001	1/32 + 1/64 + 1/128 . . .

Binary arithmetic

Arithmetic in binary is much like arithmetic in other positional notation numeral systems. Addition, subtraction, multiplication, and division can be performed on binary numerals.

Addition

The simplest arithmetic operation in binary is addition. Adding two single-digit binary numbers is relatively simple, using a form of carrying:

0 + 0 → 0

0 + 1 → 1

1 + 0 → 1

1 + 1 → 0, carry 1 (since 1 + 1 = 2 = 0 + (1 × 2¹) )

Adding two "1" digits produces a digit "0", while 1 will have to be added to the next column. This is similar to what happens in decimal when certain single-digit numbers are added together; if the result equals or exceeds the value of the radix (10), the digit to the left is incremented:

5 + 5 → 0, carry 1 (since 5 + 5 = 10 = 0 + (1 × 10¹) )

7 + 9 → 6, carry 1 (since 7 + 9 = 16 = 6 + (1 × 10¹) )

This is known as carrying. When the result of an addition exceeds the value of a digit, the procedure is to "carry" the excess amount divided by the radix (that is, 10/10) to the left, adding it to the next positional value. This is correct since the next position has a weight that is higher by a factor equal to the radix. Carrying works the same way in binary:

  1 1 1 1 1    (carried digits)
    0 1 1 0 1
+   1 0 1 1 1
-------------
= 1 0 0 1 0 0 = 36

In this example, two numerals are being added together: 01101₂ (13₁₀) and 10111₂ (23₁₀). The top row shows the carry bits used. Starting in the rightmost column, 1 + 1 = 10₂. The 1 is carried to the left, and the 0 is written at the bottom of the rightmost column. The second column from the right is added: 1 + 0 + 1 = 10₂ again; the 1 is carried, and 0 is written at the bottom. The third column: 1 + 1 + 1 = 11₂. This time, a 1 is carried, and a 1 is written in the bottom row. Proceeding like this gives the final answer 100100₂ (36₁₀).

When computers must add two numbers, the rule that: x xor y = (x + y) mod 2 for any two bits x and y allows for very fast calculation, as well.

Long carry method

A simplification for many binary addition problems is the "long carry method" or "Brookhouse Method of Binary Addition". This method is particularly useful when one of the numbers contains a long stretch of ones. It is based on the simple premise that under the binary system, when given a stretch of digits composed entirely of n ones (where n is any integer length), adding 1 will result in the number 1 followed by a string of n zeros. That concept follows, logically, just as in the decimal system, where adding 1 to a string of n 9s will result in the number 1 followed by a string of n 0s:

     Binary                        Decimal
    1 1 1 1 1     likewise        9 9 9 9 9
 +          1                  +          1
  ———————————                   ———————————
  1 0 0 0 0 0                   1 0 0 0 0 0

Such long strings are quite common in the binary system. From that one finds that large binary numbers can be added using two simple steps, without excessive carry operations. In the following example, two numerals are being added together: 1 1 1 0 1 1 1 1 1 0₂ (958₁₀) and 1 0 1 0 1 1 0 0 1 1₂ (691₁₀), using the traditional carry method on the left, and the long carry method on the right:

Traditional Carry Method                       Long Carry Method
                                vs.
  1 1 1   1 1 1 1 1      (carried digits)   1 ←     1 ←            carry the 1 until it is one digit past the "string" below
    1 1 1 0 1 1 1 1 1 0                       1 1 1 0 1 1 1 1 1 0  cross out the "string",
+   1 0 1 0 1 1 0 0 1 1                   +   1 0 1 0 1 1 0 0 1 1  and cross out the digit that was added to it
———————————————————————                    ——————————————————————
= 1 1 0 0 1 1 1 0 0 0 1                     1 1 0 0 1 1 1 0 0 0 1

The top row shows the carry bits used. Instead of the standard carry from one column to the next, the lowest-ordered "1" with a "1" in the corresponding place value beneath it may be added and a "1" may be carried to one digit past the end of the series. The "used" numbers must be crossed off, since they are already added. Other long strings may likewise be cancelled using the same technique. Then, simply add together any remaining digits normally. Proceeding in this manner gives the final answer of 1 1 0 0 1 1 1 0 0 0 1₂(1649₁₀). In our simple example using small numbers, the traditional carry method required eight carry operations, yet the long carry method required only two, representing a substantial reduction of effort.

Addition table

	0	1
0	0	1
1	1	10

The binary addition table is similar to, but not the same as, the truth table of the logical disjunction operation $\lor$ . The difference is that $1\lor 1=1$ , while $1+1=10$ .

Subtraction

Subtraction works in much the same way:

0 − 0 → 0

0 − 1 → 1, borrow 1

1 − 0 → 1

1 − 1 → 0

Subtracting a "1" digit from a "0" digit produces the digit "1", while 1 will have to be subtracted from the next column. This is known as borrowing. The principle is the same as for carrying. When the result of a subtraction is less than 0, the least possible value of a digit, the procedure is to "borrow" the deficit divided by the radix (that is, 10/10) from the left, subtracting it from the next positional value.

    *   * * *   (starred columns are borrowed from)
  1 1 0 1 1 1 0
−     1 0 1 1 1
----------------
= 1 0 1 0 1 1 1

  *             (starred columns are borrowed from)
  1 0 1 1 1 1 1
–   1 0 1 0 1 1
----------------
= 0 1 1 0 1 0 0

Subtracting a positive number is equivalent to adding a negative number of equal absolute value. Computers use signed number representations to handle negative numbers—most commonly the two's complement notation. Such representations eliminate the need for a separate "subtract" operation. Using two's complement notation, subtraction can be summarized by the following formula:

A - B = A + not B + 1

Multiplication

Multiplication in binary is similar to its decimal counterpart. Two numbers A and B can be multiplied by partial products: for each digit in B, the product of that digit in A is calculated and written on a new line, shifted leftward so that its rightmost digit lines up with the digit in B that was used. The sum of all these partial products gives the final result.

Since there are only two digits in binary, there are only two possible outcomes of each partial multiplication:

If the digit in B is 0, the partial product is also 0
If the digit in B is 1, the partial product is equal to A

For example, the binary numbers 1011 and 1010 are multiplied as follows:

           1 0 1 1   (A)
         × 1 0 1 0   (B)
         ---------
           0 0 0 0   ← Corresponds to the rightmost 'zero' in B
   +     1 0 1 1     ← Corresponds to the next 'one' in B
   +   0 0 0 0
   + 1 0 1 1
   ---------------
   = 1 1 0 1 1 1 0

Binary numbers can also be multiplied with bits after a binary point:

               1 0 1 . 1 0 1     A (5.625 in decimal)
             × 1 1 0 . 0 1       B (6.25 in decimal)
             -------------------
                   1 . 0 1 1 0 1   ← Corresponds to a 'one' in B
     +           0 0 . 0 0 0 0     ← Corresponds to a 'zero' in B
     +         0 0 0 . 0 0 0
     +       1 0 1 1 . 0 1
     +     1 0 1 1 0 . 1
     ---------------------------
     =   1 0 0 0 1 1 . 0 0 1 0 1 (35.15625 in decimal)

Multiplication table

	0	1
0	0	0
1	0	1

The binary multiplication table is the same as the truth table of the logical conjunction operation $\land$ .

Division

Long division in binary is again similar to its decimal counterpart.

In the example below, the divisor is 101₂, or 5 in decimal, while the dividend is 11011₂, or 27 in decimal. The procedure is the same as that of decimal long division; here, the divisor 101₂ goes into the first three digits 110₂ of the dividend one time, so a "1" is written on the top line. This result is multiplied by the divisor, and subtracted from the first three digits of the dividend; the next digit (a "1") is included to obtain a new three-digit sequence:

              1
        ___________
1 0 1   ) 1 1 0 1 1
        − 1 0 1
          -----
          0 0 1

The procedure is then repeated with the new sequence, continuing until the digits in the dividend have been exhausted:

             1 0 1
       ___________
1 0 1  ) 1 1 0 1 1
       − 1 0 1
         -----
             1 1 1
         −   1 0 1
             -----
             0 1 0

Thus, the quotient of 11011₂ divided by 101₂ is 101₂, as shown on the top line, while the remainder, shown on the bottom line, is 10₂. In decimal, this corresponds to the fact that 27 divided by 5 is 5, with a remainder of 2.

Aside from long division, one can also devise the procedure so as to allow for over-subtracting from the partial remainder at each iteration, thereby leading to alternative methods which are less systematic, but more flexible as a result.

Square root

The process of taking a binary square root digit by digit is the same as for a decimal square root and is explained here. An example is:

             1 0 0 1
            ---------
           √ 1010001
             1
            ---------
      101     01 
               0
             --------
      1001     100
                 0
             --------
      10001    10001
               10001
              -------
                   0

Bitwise operations

Though not directly related to the numerical interpretation of binary symbols, sequences of bits may be manipulated using Boolean logical operators. When a string of binary symbols is manipulated in this way, it is called a bitwise operation; the logical operators AND, OR, and XOR may be performed on corresponding bits in two binary numerals provided as input. The logical NOT operation may be performed on individual bits in a single binary numeral provided as input. Sometimes, such operations may be used as arithmetic short-cuts, and may have other computational benefits as well. For example, an arithmetic shift left of a binary number is the equivalent of multiplication by a (positive, integral) power of 2.

Conversion to and from other numeral systems

Decimal to binary

Conversion of (357)₁₀ to binary notation results in (101100101)

To convert from a base-10 integer to its base-2 (binary) equivalent, the number is divided by two. The remainder is the least-significant bit. The quotient is again divided by two; its remainder becomes the next least significant bit. This process repeats until a quotient of one is reached. The sequence of remainders (including the final quotient of one) forms the binary value, as each remainder must be either zero or one when dividing by two. For example, (357)₁₀ is expressed as (101100101)_2.^[43]

Binary to decimal

Conversion from base-2 to base-10 simply inverts the preceding algorithm. The bits of the binary number are used one by one, starting with the most significant (leftmost) bit. Beginning with the value 0, the prior value is doubled, and the next bit is then added to produce the next value. This can be organized in a multi-column table. For example, to convert 10010101101₂ to decimal:

Prior value	× 2 +	Next bit	= Next value
0	× 2 +	1	= 1
1	× 2 +	0	= 2
2	× 2 +	0	= 4
4	× 2 +	1	= 9
9	× 2 +	0	= 18
18	× 2 +	1	= 37
37	× 2 +	0	= 74
74	× 2 +	1	= 149
149	× 2 +	1	= 299
299	× 2 +	0	= 598
598	× 2 +	1	= 1197

The result is 1197₁₀. The first Prior Value of 0 is simply an initial decimal value. This method is an application of the Horner scheme.

Binary	1	0	0	1	0	1	0	1	1	0	1
Decimal	1×2¹⁰ +	0×2⁹ +	0×2⁸ +	1×2⁷ +	0×2⁶ +	1×2⁵ +	0×2⁴ +	1×2³ +	1×2² +	0×2¹ +	1×2⁰ =	1197

The fractional parts of a number are converted with similar methods. They are again based on the equivalence of shifting with doubling or halving.

In a fractional binary number such as 0.11010110101₂, the first digit is ${\textstyle {\frac {1}{2}}}$ , the second ${\textstyle ({\frac {1}{2}})^{2}={\frac {1}{4}}}$ , etc. So if there is a 1 in the first place after the decimal, then the number is at least ${\textstyle {\frac {1}{2}}}$ , and vice versa. Double that number is at least 1. This suggests the algorithm: Repeatedly double the number to be converted, record if the result is at least 1, and then throw away the integer part.

For example, ${\textstyle ({\frac {1}{3}})_{10}}$ , in binary, is:

Converting	Result
${\textstyle {\frac {1}{3}}}$	0.
${\textstyle {\frac {1}{3}}\times 2={\frac {2}{3}}<1}$	0.0
${\textstyle {\frac {2}{3}}\times 2=1{\frac {1}{3}}\geq 1}$	0.01
${\textstyle {\frac {1}{3}}\times 2={\frac {2}{3}}<1}$	0.010
${\textstyle {\frac {2}{3}}\times 2=1{\frac {1}{3}}\geq 1}$	0.0101

Thus the repeating decimal fraction 0.3... is equivalent to the repeating binary fraction 0.01... .

Or for example, 0.1₁₀, in binary, is:

Converting	Result
0.1	0.
0.1 × 2 = 0.2 < 1	0.0
0.2 × 2 = 0.4 < 1	0.00
0.4 × 2 = 0.8 < 1	0.000
0.8 × 2 = 1.6 ≥ 1	0.0001
0.6 × 2 = 1.2 ≥ 1	0.00011
0.2 × 2 = 0.4 < 1	0.000110
0.4 × 2 = 0.8 < 1	0.0001100
0.8 × 2 = 1.6 ≥ 1	0.00011001
0.6 × 2 = 1.2 ≥ 1	0.000110011
0.2 × 2 = 0.4 < 1	0.0001100110

This is also a repeating binary fraction 0.00011... . It may come as a surprise that terminating decimal fractions can have repeating expansions in binary. It is for this reason that many are surprised to discover that 1/10 + ... + 1/10 (addition of 10 numbers) differs from 1 in binary floating point arithmetic. In fact, the only binary fractions with terminating expansions are of the form of an integer divided by a power of 2, which 1/10 is not.

The final conversion is from binary to decimal fractions. The only difficulty arises with repeating fractions, but otherwise the method is to shift the fraction to an integer, convert it as above, and then divide by the appropriate power of two in the decimal base. For example:

${\begin{aligned}x&=&1100&.1{\overline {01110}}\ldots \\x\times 2^{6}&=&1100101110&.{\overline {01110}}\ldots \\x\times 2&=&11001&.{\overline {01110}}\ldots \\x\times (2^{6}-2)&=&1100010101\\x&=&1100010101/111110\\x&=&(789/62)_{10}\end{aligned}}$

Another way of converting from binary to decimal, often quicker for a person familiar with hexadecimal, is to do so indirectly—first converting ( $x$ in binary) into ( $x$ in hexadecimal) and then converting ( $x$ in hexadecimal) into ( $x$ in decimal).

For very large numbers, these simple methods are inefficient because they perform a large number of multiplications or divisions where one operand is very large. A simple divide-and-conquer algorithm is more effective asymptotically: given a binary number, it is divided by 10^k, where k is chosen so that the quotient roughly equals the remainder; then each of these pieces is converted to decimal and the two are concatenated. Given a decimal number, it can be split into two pieces of about the same size, each of which is converted to binary, whereupon the first converted piece is multiplied by 10^k and added to the second converted piece, where k is the number of decimal digits in the second, least-significant piece before conversion.

Hexadecimal

0_hex	=	0_dec	=	0_oct	0	0	0	0
1_hex	=	1_dec	=	1_oct	0	0	0	1
2_hex	=	2_dec	=	2_oct	0	0	1	0
3_hex	=	3_dec	=	3_oct	0	0	1	1

4_hex	=	4_dec	=	4_oct	0	1	0	0
5_hex	=	5_dec	=	5_oct	0	1	0	1
6_hex	=	6_dec	=	6_oct	0	1	1	0
7_hex	=	7_dec	=	7_oct	0	1	1	1

8_hex	=	8_dec	=	10_oct	1	0	0	0
9_hex	=	9_dec	=	11_oct	1	0	0	1
A_hex	=	10_dec	=	12_oct	1	0	1	0
B_hex	=	11_dec	=	13_oct	1	0	1	1

C_hex	=	12_dec	=	14_oct	1	1	0	0
D_hex	=	13_dec	=	15_oct	1	1	0	1
E_hex	=	14_dec	=	16_oct	1	1	1	0
F_hex	=	15_dec	=	17_oct	1	1	1	1

Binary may be converted to and from hexadecimal more easily. This is because the radix of the hexadecimal system (16) is a power of the radix of the binary system (2). More specifically, 16 = 2⁴, so it takes four digits of binary to represent one digit of hexadecimal, as shown in the adjacent table.

To convert a hexadecimal number into its binary equivalent, simply substitute the corresponding binary digits:

3A₁₆ = 0011 1010₂

E7₁₆ = 1110 0111₂

To convert a binary number into its hexadecimal equivalent, divide it into groups of four bits. If the number of bits isn't a multiple of four, simply insert extra 0 bits at the left (called padding). For example:

1010010₂ = 0101 0010 grouped with padding = 52₁₆

11011101₂ = 1101 1101 grouped = DD₁₆

To convert a hexadecimal number into its decimal equivalent, multiply the decimal equivalent of each hexadecimal digit by the corresponding power of 16 and add the resulting values:

C0E7₁₆ = (12 × 16³) + (0 × 16²) + (14 × 16¹) + (7 × 16⁰) = (12 × 4096) + (0 × 256) + (14 × 16) + (7 × 1) = 49,383₁₀

Octal

Binary is also easily converted to the octal numeral system, since octal uses a radix of 8, which is a power of two (namely, 2³, so it takes exactly three binary digits to represent an octal digit). The correspondence between octal and binary numerals is the same as for the first eight digits of hexadecimal in the table above. Binary 000 is equivalent to the octal digit 0, binary 111 is equivalent to octal 7, and so forth.

Octal	Binary
0	000
1	001
2	010
3	011
4	100
5	101
6	110
7	111

Converting from octal to binary proceeds in the same fashion as it does for hexadecimal:

65₈ = 110 101₂

17₈ = 001 111₂

And from binary to octal:

101100₂ = 101 100₂ grouped = 54₈

10011₂ = 010 011₂ grouped with padding = 23₈

And from octal to decimal:

65₈ = (6 × 8¹) + (5 × 8⁰) = (6 × 8) + (5 × 1) = 53₁₀

127₈ = (1 × 8²) + (2 × 8¹) + (7 × 8⁰) = (1 × 64) + (2 × 8) + (7 × 1) = 87₁₀

Representing real numbers

Non-integers can be represented by using negative powers, which are set off from the other digits by means of a radix point (called a decimal point in the decimal system). For example, the binary number 11.01₂ means:

1 × 2¹	(1 × 2 = 2)	plus
1 × 2⁰	(1 × 1 = 1)	plus
0 × 2⁻¹	(0 × 1⁄2 = 0)	plus
1 × 2⁻²	(1 × 1⁄4 = 0.25)

For a total of 3.25 decimal.

All dyadic rational numbers ${\frac {p}{2^{a}}}$ have a terminating binary numeral—the binary representation has a finite number of terms after the radix point. Other rational numbers have binary representation, but instead of terminating, they recur, with a finite sequence of digits repeating indefinitely. For instance

${\frac {1_{10}}{3_{10}}}={\frac {1_{2}}{11_{2}}}=0.01010101{\overline {01}}\ldots \,_{2}$ ${\frac {12_{10}}{17_{10}}}={\frac {1100_{2}}{10001_{2}}}=0.1011010010110100{\overline {10110100}}\ldots \,_{2}$

The phenomenon that the binary representation of any rational is either terminating or recurring also occurs in other radix-based numeral systems. See, for instance, the explanation in decimal. Another similarity is the existence of alternative representations for any terminating representation, relying on the fact that 0.111111... is the sum of the geometric series 2⁻¹ + 2⁻² + 2⁻³ + ... which is 1.

Binary numerals that neither terminate nor recur represent irrational numbers. For instance,

0.10100100010000100000100... does have a pattern, but it is not a fixed-length recurring pattern, so the number is irrational
1.0110101000001001111001100110011111110... is the binary representation of ${\sqrt {2}}$ , the square root of 2, another irrational. It has no discernible pattern.

Rank	Name	Location^[16]	Coordinates	Height^[16]	Circumference^[16]	Diameter	Bole Volume^[16]	Comments
1	General Sherman	Giant Forest Grove	36°34′51″N118°45′03″W^[17]	274.9 feet (83.8 m)	102.6 feet (31.3 m)	32.7 feet (10.0 m)	52,508 cubic feet (1,486.9 m³)^[15]^[18]	named after William Tecumseh Sherman
2^{[note 1]}	General Grant	General Grant Grove	36°44′53″N118°58′15″W^[19]	268.1 feet (81.7 m)	107.5 feet (32.8 m)	34.2 feet (10.4 m)	46,608 cubic feet (1,319.8 m³)^[20]^{[note 1]}	named after Ulysses S. Grant; designated as the "Nation's Christmas Tree" since 1926
3^{[note 1]}	President	Giant Forest Grove	36°34′24″N118°45′00″W^[21]	240.9 feet (73.4 m)	93.0 feet (28.3 m)	29.6 feet (9.0 m)	45,148 cubic feet (1,278.4 m³)^{[note 1]}	named after U.S. President Warren G. Harding^[24]
4	Lincoln	Giant Forest Grove	36°34′19″N118°45′22″W^[25]	255.8 feet (78.0 m)	98.3 feet (30.0 m)	31.3 feet (9.5 m)	44,471 cubic feet (1,259.3 m³)	named after Abraham Lincoln
5	Stagg	Alder Creek Grove	36°11′29″N118°37′08″W^[26]	243.0 feet (74.1 m)	109.0 feet (33.2 m)	34.7 feet (10.6 m)	42,557 cubic feet (1,205.1 m³)^[27]	named after Amos Alonzo Stagg
6	Boole	Converse Basin Grove	36°48′21″N118°58′42″W^[28]	268.8 feet (81.9 m)	113.0 feet (34.4 m)	36 feet (11 m)	42,472 cubic feet (1,202.7 m³)	named after Franklin A. Boole
7	Genesis	Mountain Home Grove	36°14′24″N118°40′18″W^[29]	253.0 feet (77.1 m)	85.3 feet (26.0 m)	27.2 feet (8.3 m)	41,897 cubic feet (1,186.4 m³)^[30]	named after Genesis
8	Franklin	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	223.8 feet (68.2 m)	94.8 feet (28.9 m)	30.2 feet (9.2 m)	41,280 cubic feet (1,169 m³)	named after Benjamin Franklin, located near Washington
9	King Arthur	Garfield Grove	36°20′00″N118°43′06″W^[32]	270.3 feet (82.4 m)	104.2 feet (31.8 m)	33.2 feet (10.1 m)	40,656 cubic feet (1,151.2 m³)	named after King Arthur
10	Monroe	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	247.8 feet (75.5 m)	91.3 feet (27.8 m)	29.1 feet (8.9 m)	40,104 cubic feet (1,135.6 m³)	named after James Monroe, located near Auto Log
11	Robert E. Lee	General Grant Grove	36°44′48″N118°58′33″W^[33]	254.7 feet (77.6 m)	88.3 feet (26.9 m)	28.1 feet (8.6 m)	40,102 cubic feet (1,135.6 m³)	named after Robert E. Lee
12	John Adams	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	250.6 feet (76.4 m)	83.3 feet (25.4 m)	26.5 feet (8.1 m)	38,956 cubic feet (1,103.1 m³)	named after John Adams, located nearCattle Cabin
13	Ishi Giant	Kennedy Grove	36°45′48″N118°49′24″W^[34]	248.1 feet (75.6 m)	105.1 feet (32.0 m)	33.5 feet (10.2 m)	38,156 cubic feet (1,080.5 m³)
14	Column	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	243.8 feet (74.3 m)	93.0 feet (28.3 m)	29.6 feet (9.0 m)	37,295 cubic feet (1,056.1 m³)	near General Pershing
15	Summit Road	Mountain Home Grove	36°14′24″N118°40′18″W^[29]	244.0 feet (74.4 m)	82.2 feet (25.1 m)	26.2 feet (8.0 m)	36,600 cubic feet (1,040 m³)
16	Euclid	Mountain Home Grove	36°14′24″N118°40′18″W^[29]	272.7 feet (83.1 m)	83.4 feet (25.4 m)	26.5 feet (8.1 m)	36,122 cubic feet (1,022.9 m³)
17	Washington	Mariposa Grove	37°30′55″N119°36′15″W^[35]	236.0 feet (71.9 m)	95.7 feet (29.2 m)	30.5 feet (9.3 m)	35,901 cubic feet (1,016.6 m³)	named after George Washington, not to be confused with the Washington tree in Giant Forest Grove
18	General Pershing	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	246.0 feet (75.0 m)	91.2 feet (27.8 m)	29 feet (8.8 m)	35,855 cubic feet (1,015.3 m³)	named after John J. Pershing
19	Diamond	Atwell Mill Grove	36°27′55″N118°40′18″W^[36]	286.0 feet (87.2 m)	95.3 feet (29.0 m)	30.3 feet (9.2 m)	35,292 cubic feet (999.4 m³)
20	Adam	Mountain Home Grove	36°14′24″N118°40′18″W^[29]	247.4 feet (75.4 m)	94.2 feet (28.7 m)	30 feet (9.1 m)	35,017 cubic feet (991.6 m³)^[37]	named after Adam
21	Roosevelt	Redwood Mountain Grove	36°41′38″N118°55′08″W^[38]	260.0 feet (79.2 m)	80.0 feet (24.4 m)	25.5 feet (7.8 m)	35,013 cubic feet (991.5 m³)	named after Theodore Roosevelt, located near Hart
22	Nelder	Nelder Grove	37°26′24″N119°35′16″W^[39]	266.2 feet (81.1 m)	90.0 feet (27.4 m)	28.6 feet (8.7 m)	34,993 cubic feet (990.9 m³)	named after John A. Nelder
23	AD	Atwell Mill Grove	36°27′55″N118°40′18″W^[36]	242.4 feet (73.9 m)	99.0 feet (30.2 m)	31.5 feet (9.6 m)	34,706 cubic feet (982.8 m³)	situated just above Diamond (hence the name "AD")
24	Hart	Redwood Mountain Grove	36°41′38″N118°55′08″W^[38]	277.9 feet (84.7 m)	75.3 feet (23.0 m)	24 feet (7.3 m)	34,407 cubic feet (974.3 m³)^[40]	named after Michael Hart, who discovered it
25	Grizzly Giant	Mariposa Grove	37°30′55″N119°36′15″W^[35]	209.0 feet (63.7 m)	92.5 feet (28.2 m)	29.4 feet (9.0 m)	34,005 cubic feet (962.9 m³)
26	Chief Sequoyah	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	228.2 feet (69.6 m)	90.4 feet (27.6 m)	28.8 feet (8.8 m)	33,608 cubic feet (951.7 m³)	named after Sequoyah
27	Methuselah	Mountain Home Grove	36°14′24″N118°40′18″W^[29]	207.8 feet (63.3 m)	95.8 feet (29.2 m)	30.5 feet (9.3 m)	32,897 cubic feet (931.5 m³)	named after Methuselah
28	Great Goshawk	Freeman Creek Grove	36°08′22″N118°30′33″W^[41]	255.2 feet (77.8 m)	90.2 feet (27.5 m)	28.7 feet (8.7 m)	32,783 cubic feet (928.3 m³)
29	Hamilton	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	238.5 feet (72.7 m)	82.6 feet (25.2 m)	26.3 feet (8.0 m)	32,783 cubic feet (928.3 m³)	named after Alexander Hamilton
30	Dean	Atwell Mill Grove	36°27′55″N118°40′18″W^[36]	235.9 feet (71.9 m)	96.4 feet (29.4 m)	30.7 feet (9.4 m)	32,333 cubic feet (915.6 m³)
31	Black Mountain Beauty	Black Mountain Grove	36°06′16″N118°39′19″W^[42]	263.0 feet (80.2 m)	76.0 feet (23.2 m)	24.2 feet (7.4 m)	32,224 cubic feet (912.5 m³)
32	Packsaddle Giant	Packsaddle Grove	35°55′26″N118°35′34″W^[43]	219.0 feet (66.8 m)	106.4 feet (32.4 m)	33.9 feet (10.3 m)	32,156 cubic feet (910.6 m³)
33	Allen Russell	Mountain Home Grove	36°14′24″N118°40′18″W^[29]	254.1 feet (77.4 m)	80.2 feet (24.4 m)	25.5 feet (7.8 m)	31,650 cubic feet (896 m³)	named after Allen I. Russell, who from 1962 to 1990 was ranger of Balch Park
34	Cleveland	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	251.0 feet (76.5 m)	80.2 feet (24.4 m)	25.5 feet (7.8 m)	31,336 cubic feet (887.3 m³)	named after Grover Cleveland
35	Dalton	Muir Grove	36°37′53″N118°50′10″W^[44]	274.5 feet (83.7 m)	76.1 feet (23.2 m)	24.2 feet (7.4 m)	31,065 cubic feet (879.7 m³)
36	Louis Agassiz	Calaveras Big Trees State Park	38°16′19″N120°17′16″W^[45]	262.0 feet (79.9 m)	98.0 feet (29.9 m)	31.2 feet (9.5 m)	30,580 cubic feet (866 m³)	named after Louis Agassiz
37	Near Ed	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	251.0 feet (76.5 m)	79.5 feet (24.2 m)	25.3 feet (7.7 m)	30,333 cubic feet (858.9 m³)
38	Evans	Kennedy Grove	36°45′48″N118°49′24″W^[34]	232.4 feet (70.8 m)	77.5 feet (23.6 m)	24.7 feet (7.5 m)	30,232 cubic feet (856.1 m³)
39	Three Fingered Jack	Mountain Home Grove	36°14′24″N118°40′18″W^[29]	240.0 feet (73.2 m)	82.5 feet (25.1 m)	26.3 feet (8.0 m)	30,118 cubic feet (852.8 m³)
40	Patriarch	McIntyre Grove	36°08′07″N118°35′05″W^[46]	176.5 feet (53.8 m)	72.6 feet (22.1 m)	23.1 feet (7.0 m)	30,020 cubic feet (850 m³)
41	Red Chief	Long Meadow Grove	35°58′58″N118°36′05″W^[47]	245.0 feet (74.7 m)	80.6 feet (24.6 m)	25.7 feet (7.8 m)	28,723 cubic feet (813.3 m³)
42	The Sentinel	Giant Forest Grove	36°33′45″N118°45′05″W^[31]	257.6 feet (78.5 m)	79.0 feet (24.1 m)	25.1 feet (7.7 m)	27,900 cubic feet (790 m³)
43	Bull Buck	Nelder Grove	37°26′24″N119°35′16″W^[39]	246.1 feet (75.0 m)	99.1 feet (30.2 m)	31.5 feet (9.6 m)	27,383 cubic feet (775.4 m³)
44	Near Gutless	McIntyre Grove	36°08′07″N118°35′05″W^[46]	252.1 feet (76.8 m)	75.6 feet (23.0 m)	24.1 feet (7.3 m)	26,737 cubic feet (757.1 m³)
45	Gutless Goliath	McIntyre Grove	36°08′07″N118°35′05″W^[46]	275.1 feet (83.9 m)	68.0 feet (20.7 m)	21.6 feet (6.6 m)	26,564 cubic feet (752.2 m³)
46	Candelabra	Packsaddle Grove	35°55′26″N118°35′34″W^[43]	205.5 feet (62.6 m)			26,341 cubic feet (745.9 m³)
47	Bannister	Freeman Creek Grove	36°08′22″N118°30′33″W^[41]	195.0 feet (59.4 m)	103.5 feet (31.5 m)	32.9 feet (10.0 m)	26,100 cubic feet (740 m³)
48	Ghost	Packsaddle Grove	35°55′26″N118°35′34″W^[43]	180.6 feet (55.0 m)	95.0 feet (29.0 m)	30.2 feet (9.2 m)	25,047 cubic feet (709.3 m³)

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Title: Word equated[Equated] word American feather. Word American feather equated word apache. Words You are able at word a patch chi or word certain(kjv(KJV))!!

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