Convert 26 087 112 740 to a Signed Binary in One's (1's) Complement Representation

How to convert decimal number 26 087 112 740(10) to a signed binary in one's (1's) complement representation

What are the steps to convert decimal number
26 087 112 740 to a signed binary in one's (1'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.

Stop when you get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 26 087 112 740 ÷ 2 = 13 043 556 370 + 0;
  • 13 043 556 370 ÷ 2 = 6 521 778 185 + 0;
  • 6 521 778 185 ÷ 2 = 3 260 889 092 + 1;
  • 3 260 889 092 ÷ 2 = 1 630 444 546 + 0;
  • 1 630 444 546 ÷ 2 = 815 222 273 + 0;
  • 815 222 273 ÷ 2 = 407 611 136 + 1;
  • 407 611 136 ÷ 2 = 203 805 568 + 0;
  • 203 805 568 ÷ 2 = 101 902 784 + 0;
  • 101 902 784 ÷ 2 = 50 951 392 + 0;
  • 50 951 392 ÷ 2 = 25 475 696 + 0;
  • 25 475 696 ÷ 2 = 12 737 848 + 0;
  • 12 737 848 ÷ 2 = 6 368 924 + 0;
  • 6 368 924 ÷ 2 = 3 184 462 + 0;
  • 3 184 462 ÷ 2 = 1 592 231 + 0;
  • 1 592 231 ÷ 2 = 796 115 + 1;
  • 796 115 ÷ 2 = 398 057 + 1;
  • 398 057 ÷ 2 = 199 028 + 1;
  • 199 028 ÷ 2 = 99 514 + 0;
  • 99 514 ÷ 2 = 49 757 + 0;
  • 49 757 ÷ 2 = 24 878 + 1;
  • 24 878 ÷ 2 = 12 439 + 0;
  • 12 439 ÷ 2 = 6 219 + 1;
  • 6 219 ÷ 2 = 3 109 + 1;
  • 3 109 ÷ 2 = 1 554 + 1;
  • 1 554 ÷ 2 = 777 + 0;
  • 777 ÷ 2 = 388 + 1;
  • 388 ÷ 2 = 194 + 0;
  • 194 ÷ 2 = 97 + 0;
  • 97 ÷ 2 = 48 + 1;
  • 48 ÷ 2 = 24 + 0;
  • 24 ÷ 2 = 12 + 0;
  • 12 ÷ 2 = 6 + 0;
  • 6 ÷ 2 = 3 + 0;
  • 3 ÷ 2 = 1 + 1;
  • 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.

26 087 112 740(10) = 110 0001 0010 1110 1001 1100 0000 0010 0100(2)

3. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 35.

  • 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, 35,

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 26 087 112 740(10) converted to signed binary in one's complement representation:

26 087 112 740(10) = 0000 0000 0000 0000 0000 0000 0000 0110 0001 0010 1110 1001 1100 0000 0010 0100

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

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

Follow the steps below to convert a signed base 10 integer number to signed binary in one'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 that is to be converted to binary, keeping track of each remainder, until we get a quotient that is equal to 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, fill in '0' bits in front (to the left) of the base 2 number calculated above, up to the right length; this way the first bit (leftmost) will always 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 '1's and all '1' bits with '0's.

Example: convert the negative number -49 from the decimal system (base ten) to signed binary one's complement:

  • 1. Start with the positive version of the number: |-49| = 49
  • 2. Divide repeatedly 49 by 2, keeping track of each remainder:
    • division = quotient + remainder
    • 49 ÷ 2 = 24 + 1
    • 24 ÷ 2 = 12 + 0
    • 12 ÷ 2 = 6 + 0
    • 6 ÷ 2 = 3 + 0
    • 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:
    49(10) = 11 0001(2)
  • 4. The actual bit length of base 2 representation is 6, so the positive binary computer representation of a signed binary will take in this case 8 bits (the least power of 2 that is larger than 6) - add '0's in front of the base 2 number, up to the required length:
    49(10) = 0011 0001(2)
  • 5. To get the negative integer number representation in signed binary one's complement, replace all '0' bits with '1's and all '1' bits with '0's:
    -49(10) = 1100 1110
  • Number -49(10), signed integer, converted from the decimal system (base 10) to signed binary in one's complement representation = 1100 1110