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;
- 111 101 111 023 ÷ 2 = 55 550 555 511 + 1;
- 55 550 555 511 ÷ 2 = 27 775 277 755 + 1;
- 27 775 277 755 ÷ 2 = 13 887 638 877 + 1;
- 13 887 638 877 ÷ 2 = 6 943 819 438 + 1;
- 6 943 819 438 ÷ 2 = 3 471 909 719 + 0;
- 3 471 909 719 ÷ 2 = 1 735 954 859 + 1;
- 1 735 954 859 ÷ 2 = 867 977 429 + 1;
- 867 977 429 ÷ 2 = 433 988 714 + 1;
- 433 988 714 ÷ 2 = 216 994 357 + 0;
- 216 994 357 ÷ 2 = 108 497 178 + 1;
- 108 497 178 ÷ 2 = 54 248 589 + 0;
- 54 248 589 ÷ 2 = 27 124 294 + 1;
- 27 124 294 ÷ 2 = 13 562 147 + 0;
- 13 562 147 ÷ 2 = 6 781 073 + 1;
- 6 781 073 ÷ 2 = 3 390 536 + 1;
- 3 390 536 ÷ 2 = 1 695 268 + 0;
- 1 695 268 ÷ 2 = 847 634 + 0;
- 847 634 ÷ 2 = 423 817 + 0;
- 423 817 ÷ 2 = 211 908 + 1;
- 211 908 ÷ 2 = 105 954 + 0;
- 105 954 ÷ 2 = 52 977 + 0;
- 52 977 ÷ 2 = 26 488 + 1;
- 26 488 ÷ 2 = 13 244 + 0;
- 13 244 ÷ 2 = 6 622 + 0;
- 6 622 ÷ 2 = 3 311 + 0;
- 3 311 ÷ 2 = 1 655 + 1;
- 1 655 ÷ 2 = 827 + 1;
- 827 ÷ 2 = 413 + 1;
- 413 ÷ 2 = 206 + 1;
- 206 ÷ 2 = 103 + 0;
- 103 ÷ 2 = 51 + 1;
- 51 ÷ 2 = 25 + 1;
- 25 ÷ 2 = 12 + 1;
- 12 ÷ 2 = 6 + 0;
- 6 ÷ 2 = 3 + 0;
- 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.
111 101 111 023(10) = 1 1001 1101 1110 0010 0100 0110 1010 1110 1111(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 37.
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, 37,
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 111 101 111 023(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:
111 101 111 023(10) = 0000 0000 0000 0000 0000 0000 0001 1001 1101 1110 0010 0100 0110 1010 1110 1111
Spaces were used to group digits: for binary, by 4, for decimal, by 3.