One's Complement: Integer ↗ Binary: 1 011 110 010 999 985 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 1 011 110 010 999 985(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;
  • 1 011 110 010 999 985 ÷ 2 = 505 555 005 499 992 + 1;
  • 505 555 005 499 992 ÷ 2 = 252 777 502 749 996 + 0;
  • 252 777 502 749 996 ÷ 2 = 126 388 751 374 998 + 0;
  • 126 388 751 374 998 ÷ 2 = 63 194 375 687 499 + 0;
  • 63 194 375 687 499 ÷ 2 = 31 597 187 843 749 + 1;
  • 31 597 187 843 749 ÷ 2 = 15 798 593 921 874 + 1;
  • 15 798 593 921 874 ÷ 2 = 7 899 296 960 937 + 0;
  • 7 899 296 960 937 ÷ 2 = 3 949 648 480 468 + 1;
  • 3 949 648 480 468 ÷ 2 = 1 974 824 240 234 + 0;
  • 1 974 824 240 234 ÷ 2 = 987 412 120 117 + 0;
  • 987 412 120 117 ÷ 2 = 493 706 060 058 + 1;
  • 493 706 060 058 ÷ 2 = 246 853 030 029 + 0;
  • 246 853 030 029 ÷ 2 = 123 426 515 014 + 1;
  • 123 426 515 014 ÷ 2 = 61 713 257 507 + 0;
  • 61 713 257 507 ÷ 2 = 30 856 628 753 + 1;
  • 30 856 628 753 ÷ 2 = 15 428 314 376 + 1;
  • 15 428 314 376 ÷ 2 = 7 714 157 188 + 0;
  • 7 714 157 188 ÷ 2 = 3 857 078 594 + 0;
  • 3 857 078 594 ÷ 2 = 1 928 539 297 + 0;
  • 1 928 539 297 ÷ 2 = 964 269 648 + 1;
  • 964 269 648 ÷ 2 = 482 134 824 + 0;
  • 482 134 824 ÷ 2 = 241 067 412 + 0;
  • 241 067 412 ÷ 2 = 120 533 706 + 0;
  • 120 533 706 ÷ 2 = 60 266 853 + 0;
  • 60 266 853 ÷ 2 = 30 133 426 + 1;
  • 30 133 426 ÷ 2 = 15 066 713 + 0;
  • 15 066 713 ÷ 2 = 7 533 356 + 1;
  • 7 533 356 ÷ 2 = 3 766 678 + 0;
  • 3 766 678 ÷ 2 = 1 883 339 + 0;
  • 1 883 339 ÷ 2 = 941 669 + 1;
  • 941 669 ÷ 2 = 470 834 + 1;
  • 470 834 ÷ 2 = 235 417 + 0;
  • 235 417 ÷ 2 = 117 708 + 1;
  • 117 708 ÷ 2 = 58 854 + 0;
  • 58 854 ÷ 2 = 29 427 + 0;
  • 29 427 ÷ 2 = 14 713 + 1;
  • 14 713 ÷ 2 = 7 356 + 1;
  • 7 356 ÷ 2 = 3 678 + 0;
  • 3 678 ÷ 2 = 1 839 + 0;
  • 1 839 ÷ 2 = 919 + 1;
  • 919 ÷ 2 = 459 + 1;
  • 459 ÷ 2 = 229 + 1;
  • 229 ÷ 2 = 114 + 1;
  • 114 ÷ 2 = 57 + 0;
  • 57 ÷ 2 = 28 + 1;
  • 28 ÷ 2 = 14 + 0;
  • 14 ÷ 2 = 7 + 0;
  • 7 ÷ 2 = 3 + 1;
  • 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.


1 011 110 010 999 985(10) = 11 1001 0111 1001 1001 0110 0101 0000 1000 1101 0100 1011 0001(2)


3. Determine the signed binary number bit length:

The base 2 number's actual length, in bits: 50.


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, 50,

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.


Number 1 011 110 010 999 985(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:

1 011 110 010 999 985(10) = 0000 0000 0000 0011 1001 0111 1001 1001 0110 0101 0000 1000 1101 0100 1011 0001

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