Convert -19 531 236 125 to a Signed Binary in Two's (2's) Complement Representation

How to convert decimal number -19 531 236 125(10) to a signed binary in two's (2's) complement representation

What are the steps to convert decimal number
-19 531 236 125 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. Start with the positive version of the number:

|-19 531 236 125| = 19 531 236 125

2. 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;
  • 19 531 236 125 ÷ 2 = 9 765 618 062 + 1;
  • 9 765 618 062 ÷ 2 = 4 882 809 031 + 0;
  • 4 882 809 031 ÷ 2 = 2 441 404 515 + 1;
  • 2 441 404 515 ÷ 2 = 1 220 702 257 + 1;
  • 1 220 702 257 ÷ 2 = 610 351 128 + 1;
  • 610 351 128 ÷ 2 = 305 175 564 + 0;
  • 305 175 564 ÷ 2 = 152 587 782 + 0;
  • 152 587 782 ÷ 2 = 76 293 891 + 0;
  • 76 293 891 ÷ 2 = 38 146 945 + 1;
  • 38 146 945 ÷ 2 = 19 073 472 + 1;
  • 19 073 472 ÷ 2 = 9 536 736 + 0;
  • 9 536 736 ÷ 2 = 4 768 368 + 0;
  • 4 768 368 ÷ 2 = 2 384 184 + 0;
  • 2 384 184 ÷ 2 = 1 192 092 + 0;
  • 1 192 092 ÷ 2 = 596 046 + 0;
  • 596 046 ÷ 2 = 298 023 + 0;
  • 298 023 ÷ 2 = 149 011 + 1;
  • 149 011 ÷ 2 = 74 505 + 1;
  • 74 505 ÷ 2 = 37 252 + 1;
  • 37 252 ÷ 2 = 18 626 + 0;
  • 18 626 ÷ 2 = 9 313 + 0;
  • 9 313 ÷ 2 = 4 656 + 1;
  • 4 656 ÷ 2 = 2 328 + 0;
  • 2 328 ÷ 2 = 1 164 + 0;
  • 1 164 ÷ 2 = 582 + 0;
  • 582 ÷ 2 = 291 + 0;
  • 291 ÷ 2 = 145 + 1;
  • 145 ÷ 2 = 72 + 1;
  • 72 ÷ 2 = 36 + 0;
  • 36 ÷ 2 = 18 + 0;
  • 18 ÷ 2 = 9 + 0;
  • 9 ÷ 2 = 4 + 1;
  • 4 ÷ 2 = 2 + 0;
  • 2 ÷ 2 = 1 + 0;
  • 1 ÷ 2 = 0 + 1;

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

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

19 531 236 125(10) = 100 1000 1100 0010 0111 0000 0011 0001 1101(2)

4. 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.


5. 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.


19 531 236 125(10) = 0000 0000 0000 0000 0000 0000 0000 0100 1000 1100 0010 0111 0000 0011 0001 1101

6. Get the negative integer number representation. Part 1:

  • To write the negative integer number on 64 bits (8 Bytes), as a signed binary in one's complement representation, replace all the bits on 0 with 1s and all the bits set on 1 with 0s.

Reverse the digits, flip the digits:

Replace the bits set on 0 with 1s and the bits set on 1 with 0s.

!(0000 0000 0000 0000 0000 0000 0000 0100 1000 1100 0010 0111 0000 0011 0001 1101)

= 1111 1111 1111 1111 1111 1111 1111 1011 0111 0011 1101 1000 1111 1100 1110 0010


7. Get the negative integer number representation. Part 2:

  • To write the negative integer number on 64 bits (8 Bytes), as a signed binary in two's complement representation, add 1 to the number calculated above 1111 1111 1111 1111 1111 1111 1111 1011 0111 0011 1101 1000 1111 1100 1110 0010 (to the signed binary in one's complement representation).

Binary addition carries on a value of 2:

  • 0 + 0 = 0
  • 0 + 1 = 1
  • 1 + 1 = 10
  • 1 + 10 = 11
  • 1 + 11 = 100

Add 1 to the number calculated above
(to the signed binary number in one's complement representation):

-19 531 236 125 =

1111 1111 1111 1111 1111 1111 1111 1011 0111 0011 1101 1000 1111 1100 1110 0010 + 1


Decimal Number -19 531 236 125(10) converted to signed binary in two's complement representation:

-19 531 236 125(10) = 1111 1111 1111 1111 1111 1111 1111 1011 0111 0011 1101 1000 1111 1100 1110 0011

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