Two's Complement: Integer ↗ Binary: 1 111 011 111 011 154 Convert the Integer Number to a Signed Binary in Two's Complement Representation. Write the Base Ten Decimal System Number as a Binary Code (Written in Base Two)

Signed integer number 1 111 011 111 011 154(10) converted and written as a signed binary in two'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;
  • 1 111 011 111 011 154 ÷ 2 = 555 505 555 505 577 + 0;
  • 555 505 555 505 577 ÷ 2 = 277 752 777 752 788 + 1;
  • 277 752 777 752 788 ÷ 2 = 138 876 388 876 394 + 0;
  • 138 876 388 876 394 ÷ 2 = 69 438 194 438 197 + 0;
  • 69 438 194 438 197 ÷ 2 = 34 719 097 219 098 + 1;
  • 34 719 097 219 098 ÷ 2 = 17 359 548 609 549 + 0;
  • 17 359 548 609 549 ÷ 2 = 8 679 774 304 774 + 1;
  • 8 679 774 304 774 ÷ 2 = 4 339 887 152 387 + 0;
  • 4 339 887 152 387 ÷ 2 = 2 169 943 576 193 + 1;
  • 2 169 943 576 193 ÷ 2 = 1 084 971 788 096 + 1;
  • 1 084 971 788 096 ÷ 2 = 542 485 894 048 + 0;
  • 542 485 894 048 ÷ 2 = 271 242 947 024 + 0;
  • 271 242 947 024 ÷ 2 = 135 621 473 512 + 0;
  • 135 621 473 512 ÷ 2 = 67 810 736 756 + 0;
  • 67 810 736 756 ÷ 2 = 33 905 368 378 + 0;
  • 33 905 368 378 ÷ 2 = 16 952 684 189 + 0;
  • 16 952 684 189 ÷ 2 = 8 476 342 094 + 1;
  • 8 476 342 094 ÷ 2 = 4 238 171 047 + 0;
  • 4 238 171 047 ÷ 2 = 2 119 085 523 + 1;
  • 2 119 085 523 ÷ 2 = 1 059 542 761 + 1;
  • 1 059 542 761 ÷ 2 = 529 771 380 + 1;
  • 529 771 380 ÷ 2 = 264 885 690 + 0;
  • 264 885 690 ÷ 2 = 132 442 845 + 0;
  • 132 442 845 ÷ 2 = 66 221 422 + 1;
  • 66 221 422 ÷ 2 = 33 110 711 + 0;
  • 33 110 711 ÷ 2 = 16 555 355 + 1;
  • 16 555 355 ÷ 2 = 8 277 677 + 1;
  • 8 277 677 ÷ 2 = 4 138 838 + 1;
  • 4 138 838 ÷ 2 = 2 069 419 + 0;
  • 2 069 419 ÷ 2 = 1 034 709 + 1;
  • 1 034 709 ÷ 2 = 517 354 + 1;
  • 517 354 ÷ 2 = 258 677 + 0;
  • 258 677 ÷ 2 = 129 338 + 1;
  • 129 338 ÷ 2 = 64 669 + 0;
  • 64 669 ÷ 2 = 32 334 + 1;
  • 32 334 ÷ 2 = 16 167 + 0;
  • 16 167 ÷ 2 = 8 083 + 1;
  • 8 083 ÷ 2 = 4 041 + 1;
  • 4 041 ÷ 2 = 2 020 + 1;
  • 2 020 ÷ 2 = 1 010 + 0;
  • 1 010 ÷ 2 = 505 + 0;
  • 505 ÷ 2 = 252 + 1;
  • 252 ÷ 2 = 126 + 0;
  • 126 ÷ 2 = 63 + 0;
  • 63 ÷ 2 = 31 + 1;
  • 31 ÷ 2 = 15 + 1;
  • 15 ÷ 2 = 7 + 1;
  • 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.


1 111 011 111 011 154(10) = 11 1111 0010 0111 0101 0110 1110 1001 1101 0000 0011 0101 0010(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 1 111 011 111 011 154(10), a signed integer number (with sign), converted from decimal system (from base 10) and written as a signed binary in two's complement representation:

1 111 011 111 011 154(10) = 0000 0000 0000 0011 1111 0010 0111 0101 0110 1110 1001 1101 0000 0011 0101 0010

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