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;
- 2 001 112 072 ÷ 2 = 1 000 556 036 + 0;
- 1 000 556 036 ÷ 2 = 500 278 018 + 0;
- 500 278 018 ÷ 2 = 250 139 009 + 0;
- 250 139 009 ÷ 2 = 125 069 504 + 1;
- 125 069 504 ÷ 2 = 62 534 752 + 0;
- 62 534 752 ÷ 2 = 31 267 376 + 0;
- 31 267 376 ÷ 2 = 15 633 688 + 0;
- 15 633 688 ÷ 2 = 7 816 844 + 0;
- 7 816 844 ÷ 2 = 3 908 422 + 0;
- 3 908 422 ÷ 2 = 1 954 211 + 0;
- 1 954 211 ÷ 2 = 977 105 + 1;
- 977 105 ÷ 2 = 488 552 + 1;
- 488 552 ÷ 2 = 244 276 + 0;
- 244 276 ÷ 2 = 122 138 + 0;
- 122 138 ÷ 2 = 61 069 + 0;
- 61 069 ÷ 2 = 30 534 + 1;
- 30 534 ÷ 2 = 15 267 + 0;
- 15 267 ÷ 2 = 7 633 + 1;
- 7 633 ÷ 2 = 3 816 + 1;
- 3 816 ÷ 2 = 1 908 + 0;
- 1 908 ÷ 2 = 954 + 0;
- 954 ÷ 2 = 477 + 0;
- 477 ÷ 2 = 238 + 1;
- 238 ÷ 2 = 119 + 0;
- 119 ÷ 2 = 59 + 1;
- 59 ÷ 2 = 29 + 1;
- 29 ÷ 2 = 14 + 1;
- 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.
2 001 112 072(10) = 111 0111 0100 0110 1000 1100 0000 1000(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 31.
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, 31,
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 2 001 112 072(10), a signed integer number (with sign),
converted from decimal system (from base 10)
and written as a signed binary (in base 2):
2 001 112 072(10) = 0111 0111 0100 0110 1000 1100 0000 1000
Spaces were used to group digits: for binary, by 4, for decimal, by 3.