One's Complement: Integer ↗ Binary: 349 780 326 Convert the Integer Number to a Signed Binary in One's Complement Representation. Write the Base Ten Decimal System Number as a Binary Code (Written in Base Two)

Signed integer number 349 780 326(10) converted and written as a signed binary in one's complement representation (base 2) = ?

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;
  • 349 780 326 ÷ 2 = 174 890 163 + 0;
  • 174 890 163 ÷ 2 = 87 445 081 + 1;
  • 87 445 081 ÷ 2 = 43 722 540 + 1;
  • 43 722 540 ÷ 2 = 21 861 270 + 0;
  • 21 861 270 ÷ 2 = 10 930 635 + 0;
  • 10 930 635 ÷ 2 = 5 465 317 + 1;
  • 5 465 317 ÷ 2 = 2 732 658 + 1;
  • 2 732 658 ÷ 2 = 1 366 329 + 0;
  • 1 366 329 ÷ 2 = 683 164 + 1;
  • 683 164 ÷ 2 = 341 582 + 0;
  • 341 582 ÷ 2 = 170 791 + 0;
  • 170 791 ÷ 2 = 85 395 + 1;
  • 85 395 ÷ 2 = 42 697 + 1;
  • 42 697 ÷ 2 = 21 348 + 1;
  • 21 348 ÷ 2 = 10 674 + 0;
  • 10 674 ÷ 2 = 5 337 + 0;
  • 5 337 ÷ 2 = 2 668 + 1;
  • 2 668 ÷ 2 = 1 334 + 0;
  • 1 334 ÷ 2 = 667 + 0;
  • 667 ÷ 2 = 333 + 1;
  • 333 ÷ 2 = 166 + 1;
  • 166 ÷ 2 = 83 + 0;
  • 83 ÷ 2 = 41 + 1;
  • 41 ÷ 2 = 20 + 1;
  • 20 ÷ 2 = 10 + 0;
  • 10 ÷ 2 = 5 + 0;
  • 5 ÷ 2 = 2 + 1;
  • 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.


349 780 326(10) = 1 0100 1101 1001 0011 1001 0110 0110(2)


3. Determine the signed binary number bit length:

The base 2 number's actual length, in bits: 29.

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, 29,

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

=== is: 32.


4. Get the positive binary computer representation on 32 bits (4 Bytes):

If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 32.


Number 349 780 326(10), a signed integer number (with sign), converted from decimal system (from base 10) and written as a signed binary in one's complement representation:

349 780 326(10) = 0001 0100 1101 1001 0011 1001 0110 0110

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

More operations on signed integers written as signed binary numbers in one's complement representation:

» Signed integer number 349 780 325 converted from decimal system (from base 10) and written as a signed binary in one's complement representation (written in base 2) = ?

» Signed integer number 349 780 327 converted from decimal system (from base 10) and written as a signed binary in one's complement representation (written in base 2) = ?

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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