Convert 1 111 001 000 856 to a Signed Binary in Two's (2's) Complement Representation

How to convert decimal number 1 111 001 000 856(10) to a signed binary in two's (2's) complement representation

What are the steps to convert decimal number
1 111 001 000 856 to a signed binary in two's (2's) complement representation?

  • A signed integer, written in base ten, or a decimal system number, is a number written using the digits 0 through 9 and the sign, which can be positive (+) or negative (-). If positive, the sign is usually not written. A number written in base two, or binary, is a number written using only the digits 0 and 1.

1. Divide the number repeatedly by 2:

Keep track of each remainder.

We stop when we get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 1 111 001 000 856 ÷ 2 = 555 500 500 428 + 0;
  • 555 500 500 428 ÷ 2 = 277 750 250 214 + 0;
  • 277 750 250 214 ÷ 2 = 138 875 125 107 + 0;
  • 138 875 125 107 ÷ 2 = 69 437 562 553 + 1;
  • 69 437 562 553 ÷ 2 = 34 718 781 276 + 1;
  • 34 718 781 276 ÷ 2 = 17 359 390 638 + 0;
  • 17 359 390 638 ÷ 2 = 8 679 695 319 + 0;
  • 8 679 695 319 ÷ 2 = 4 339 847 659 + 1;
  • 4 339 847 659 ÷ 2 = 2 169 923 829 + 1;
  • 2 169 923 829 ÷ 2 = 1 084 961 914 + 1;
  • 1 084 961 914 ÷ 2 = 542 480 957 + 0;
  • 542 480 957 ÷ 2 = 271 240 478 + 1;
  • 271 240 478 ÷ 2 = 135 620 239 + 0;
  • 135 620 239 ÷ 2 = 67 810 119 + 1;
  • 67 810 119 ÷ 2 = 33 905 059 + 1;
  • 33 905 059 ÷ 2 = 16 952 529 + 1;
  • 16 952 529 ÷ 2 = 8 476 264 + 1;
  • 8 476 264 ÷ 2 = 4 238 132 + 0;
  • 4 238 132 ÷ 2 = 2 119 066 + 0;
  • 2 119 066 ÷ 2 = 1 059 533 + 0;
  • 1 059 533 ÷ 2 = 529 766 + 1;
  • 529 766 ÷ 2 = 264 883 + 0;
  • 264 883 ÷ 2 = 132 441 + 1;
  • 132 441 ÷ 2 = 66 220 + 1;
  • 66 220 ÷ 2 = 33 110 + 0;
  • 33 110 ÷ 2 = 16 555 + 0;
  • 16 555 ÷ 2 = 8 277 + 1;
  • 8 277 ÷ 2 = 4 138 + 1;
  • 4 138 ÷ 2 = 2 069 + 0;
  • 2 069 ÷ 2 = 1 034 + 1;
  • 1 034 ÷ 2 = 517 + 0;
  • 517 ÷ 2 = 258 + 1;
  • 258 ÷ 2 = 129 + 0;
  • 129 ÷ 2 = 64 + 1;
  • 64 ÷ 2 = 32 + 0;
  • 32 ÷ 2 = 16 + 0;
  • 16 ÷ 2 = 8 + 0;
  • 8 ÷ 2 = 4 + 0;
  • 4 ÷ 2 = 2 + 0;
  • 2 ÷ 2 = 1 + 0;
  • 1 ÷ 2 = 0 + 1;

2. Construct the base 2 representation of the positive number:

Take all the remainders starting from the bottom of the list constructed above.

1 111 001 000 856(10) = 1 0000 0010 1010 1100 1101 0001 1110 1011 1001 1000(2)

3. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 41.

  • A signed binary's bit length must be equal to a power of 2, as of:
  • 21 = 2; 22 = 4; 23 = 8; 24 = 16; 25 = 32; 26 = 64; ...
  • The first bit (the leftmost) indicates the sign:
  • 0 = positive integer number, 1 = negative integer number

The least number that is:

1) a power of 2

2) and is larger than the actual length, 41,

3) so that the first bit (leftmost) could be zero
(we deal with a positive number at this moment)

=== is: 64.


4. Get the positive binary computer representation on 64 bits (8 Bytes):

If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 64.


Decimal Number 1 111 001 000 856(10) converted to signed binary in two's complement representation:

1 111 001 000 856(10) = 0000 0000 0000 0000 0000 0001 0000 0010 1010 1100 1101 0001 1110 1011 1001 1000

Spaces were used to group digits: for binary, by 4, for decimal, by 3.

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How to convert signed integers from decimal system to signed binary in two's complement representation

Follow the steps below to convert a signed base 10 integer number to signed binary in two's complement representation:

  • 1. If the number to be converted is negative, start with the positive version of the number.
  • 2. Divide repeatedly by 2 the positive representation of the integer number, keeping track of each remainder, until we get a quotient that is zero.
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above. Thus, the last remainder of the divisions becomes the first symbol (the leftmost) of the base two number, while the first remainder becomes the last symbol (the rightmost).
  • 4. Binary numbers represented in computer language must have 4, 8, 16, 32, 64, ... bit length (a power of 2) - if needed, add extra bits on 0 in front (to the left) of the base 2 number above, up to the required length, so that the first bit (the leftmost) will be 0, correctly representing a positive number.
  • 5. To get the negative integer number representation in signed binary one's complement, replace all 0 bits with 1s and all 1 bits with 0s (reversing the digits).
  • 6. To get the negative integer number, in signed binary two's complement representation, add 1 to the number above.

Example: convert the negative number -60 from the decimal system (base ten) to signed binary in two's complement:

  • 1. Start with the positive version of the number: |-60| = 60
  • 2. Divide repeatedly 60 by 2, keeping track of each remainder:
    • division = quotient + remainder
    • 60 ÷ 2 = 30 + 0
    • 30 ÷ 2 = 15 + 0
    • 15 ÷ 2 = 7 + 1
    • 7 ÷ 2 = 3 + 1
    • 3 ÷ 2 = 1 + 1
    • 1 ÷ 2 = 0 + 1
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above:
    60(10) = 11 1100(2)
  • 4. Bit length of base 2 representation number is 6, so the positive binary computer representation of a signed binary will take in this particular case 8 bits (the least power of 2 larger than 6) - add extra 0 digits in front of the base 2 number, up to the required length:
    60(10) = 0011 1100(2)
  • 5. To get the negative integer number representation in signed binary one's complement, replace all the 0 bits with 1s and all 1 bits with 0s (reversing the digits):
    !(0011 1100) = 1100 0011
  • 6. To get the negative integer number, signed binary in two's complement representation, add 1 to the number above:
    -60(10) = 1100 0011 + 1 = 1100 0100
  • Number -60(10), signed integer, converted from decimal system (base 10) to signed binary two's complement representation = 1100 0100