Signed: Integer ↗ Binary: 11 111 111 111 110 886 Convert the Integer Number to a Signed Binary. Converting and Writing the Base Ten Decimal System Signed Integer as Binary Code (Written in Base Two)

Signed integer number 11 111 111 111 110 886(10)
converted and written as a signed binary (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;
  • 11 111 111 111 110 886 ÷ 2 = 5 555 555 555 555 443 + 0;
  • 5 555 555 555 555 443 ÷ 2 = 2 777 777 777 777 721 + 1;
  • 2 777 777 777 777 721 ÷ 2 = 1 388 888 888 888 860 + 1;
  • 1 388 888 888 888 860 ÷ 2 = 694 444 444 444 430 + 0;
  • 694 444 444 444 430 ÷ 2 = 347 222 222 222 215 + 0;
  • 347 222 222 222 215 ÷ 2 = 173 611 111 111 107 + 1;
  • 173 611 111 111 107 ÷ 2 = 86 805 555 555 553 + 1;
  • 86 805 555 555 553 ÷ 2 = 43 402 777 777 776 + 1;
  • 43 402 777 777 776 ÷ 2 = 21 701 388 888 888 + 0;
  • 21 701 388 888 888 ÷ 2 = 10 850 694 444 444 + 0;
  • 10 850 694 444 444 ÷ 2 = 5 425 347 222 222 + 0;
  • 5 425 347 222 222 ÷ 2 = 2 712 673 611 111 + 0;
  • 2 712 673 611 111 ÷ 2 = 1 356 336 805 555 + 1;
  • 1 356 336 805 555 ÷ 2 = 678 168 402 777 + 1;
  • 678 168 402 777 ÷ 2 = 339 084 201 388 + 1;
  • 339 084 201 388 ÷ 2 = 169 542 100 694 + 0;
  • 169 542 100 694 ÷ 2 = 84 771 050 347 + 0;
  • 84 771 050 347 ÷ 2 = 42 385 525 173 + 1;
  • 42 385 525 173 ÷ 2 = 21 192 762 586 + 1;
  • 21 192 762 586 ÷ 2 = 10 596 381 293 + 0;
  • 10 596 381 293 ÷ 2 = 5 298 190 646 + 1;
  • 5 298 190 646 ÷ 2 = 2 649 095 323 + 0;
  • 2 649 095 323 ÷ 2 = 1 324 547 661 + 1;
  • 1 324 547 661 ÷ 2 = 662 273 830 + 1;
  • 662 273 830 ÷ 2 = 331 136 915 + 0;
  • 331 136 915 ÷ 2 = 165 568 457 + 1;
  • 165 568 457 ÷ 2 = 82 784 228 + 1;
  • 82 784 228 ÷ 2 = 41 392 114 + 0;
  • 41 392 114 ÷ 2 = 20 696 057 + 0;
  • 20 696 057 ÷ 2 = 10 348 028 + 1;
  • 10 348 028 ÷ 2 = 5 174 014 + 0;
  • 5 174 014 ÷ 2 = 2 587 007 + 0;
  • 2 587 007 ÷ 2 = 1 293 503 + 1;
  • 1 293 503 ÷ 2 = 646 751 + 1;
  • 646 751 ÷ 2 = 323 375 + 1;
  • 323 375 ÷ 2 = 161 687 + 1;
  • 161 687 ÷ 2 = 80 843 + 1;
  • 80 843 ÷ 2 = 40 421 + 1;
  • 40 421 ÷ 2 = 20 210 + 1;
  • 20 210 ÷ 2 = 10 105 + 0;
  • 10 105 ÷ 2 = 5 052 + 1;
  • 5 052 ÷ 2 = 2 526 + 0;
  • 2 526 ÷ 2 = 1 263 + 0;
  • 1 263 ÷ 2 = 631 + 1;
  • 631 ÷ 2 = 315 + 1;
  • 315 ÷ 2 = 157 + 1;
  • 157 ÷ 2 = 78 + 1;
  • 78 ÷ 2 = 39 + 0;
  • 39 ÷ 2 = 19 + 1;
  • 19 ÷ 2 = 9 + 1;
  • 9 ÷ 2 = 4 + 1;
  • 4 ÷ 2 = 2 + 0;
  • 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.


11 111 111 111 110 886(10) = 10 0111 0111 1001 0111 1111 0010 0110 1101 0110 0111 0000 1110 0110(2)


3. Determine the signed binary number bit length:

The base 2 number's actual length, in bits: 54.


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) is reserved for 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, 54,

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 11 111 111 111 110 886(10), a signed integer number (with sign),
converted from decimal system (from base 10)
and written as a signed binary (in base 2):

11 111 111 111 110 886(10) = 0000 0000 0010 0111 0111 1001 0111 1111 0010 0110 1101 0110 0111 0000 1110 0110

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 binary code system

Follow the steps below to convert a signed base ten integer number to signed binary:

  • 1. In a signed binary, first bit (the leftmost) is reserved for sign: 0 = positive integer number, 1 = positive integer number. If the number to be converted is negative, start with its positive version.
  • 2. Divide repeatedly by 2 the positive integer number keeping track of each remainder. STOP when 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 have a length of 4, 8, 16, 32, 64, ... bits (power of 2) - if needed, fill in extra '0' bits in front of the base 2 number (to the left), up to the right length; this way the first bit (the leftmost one) is always '0', as for a positive representation.
  • 5. To get the negative reprezentation of the number, simply switch the first bit (the leftmost one), from '0' to '1'.

Example: convert the negative number -63 from decimal system (base ten) to signed binary code system:

  • 1. Start with the positive version of the number: |-63| = 63;
  • 2. Divide repeatedly 63 by 2, keeping track of each remainder, until we get a quotient that is equal to zero:
    • division = quotient + remainder
    • 63 ÷ 2 = 31 + 1
    • 31 ÷ 2 = 15 + 1
    • 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:
    63(10) = 11 1111(2)
  • 4. The actual length of base 2 representation number is 6, so the positive binary computer representation length of the signed binary will take in this case 8 bits (the least power of 2 higher than 6) - add extra '0's in front (to the left), up to the required length; this way the first bit (the leftmost one) is to be '0', as for a positive number:
    63(10) = 0011 1111(2)
  • 5. To get the negative integer number representation simply change the first bit (the leftmost), from '0' to '1':
    -63(10) = 1011 1111
  • Number -63(10), signed integer, converted from decimal system (base 10) to signed binary = 1011 1111