What are the required steps to convert base 10 integer
number 4 294 836 323 to signed binary code (in base 2)?
- A signed integer, written in base ten, or a decimal system number, is a number written using the digits 0 through 9 and the sign, which can be positive (+) or negative (-). If positive, the sign is usually not written. A number written in base two, or binary, is a number written using only the digits 0 and 1.
1. Divide the number repeatedly by 2:
Keep track of each remainder.
Stop when you get a quotient that is equal to zero.
- division = quotient + remainder;
- 4 294 836 323 ÷ 2 = 2 147 418 161 + 1;
- 2 147 418 161 ÷ 2 = 1 073 709 080 + 1;
- 1 073 709 080 ÷ 2 = 536 854 540 + 0;
- 536 854 540 ÷ 2 = 268 427 270 + 0;
- 268 427 270 ÷ 2 = 134 213 635 + 0;
- 134 213 635 ÷ 2 = 67 106 817 + 1;
- 67 106 817 ÷ 2 = 33 553 408 + 1;
- 33 553 408 ÷ 2 = 16 776 704 + 0;
- 16 776 704 ÷ 2 = 8 388 352 + 0;
- 8 388 352 ÷ 2 = 4 194 176 + 0;
- 4 194 176 ÷ 2 = 2 097 088 + 0;
- 2 097 088 ÷ 2 = 1 048 544 + 0;
- 1 048 544 ÷ 2 = 524 272 + 0;
- 524 272 ÷ 2 = 262 136 + 0;
- 262 136 ÷ 2 = 131 068 + 0;
- 131 068 ÷ 2 = 65 534 + 0;
- 65 534 ÷ 2 = 32 767 + 0;
- 32 767 ÷ 2 = 16 383 + 1;
- 16 383 ÷ 2 = 8 191 + 1;
- 8 191 ÷ 2 = 4 095 + 1;
- 4 095 ÷ 2 = 2 047 + 1;
- 2 047 ÷ 2 = 1 023 + 1;
- 1 023 ÷ 2 = 511 + 1;
- 511 ÷ 2 = 255 + 1;
- 255 ÷ 2 = 127 + 1;
- 127 ÷ 2 = 63 + 1;
- 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.
4 294 836 323(10) = 1111 1111 1111 1110 0000 0000 0110 0011(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 32.
- 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, 32,
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:
4 294 836 323(10) Base 10 integer number converted and written as a signed binary code (in base 2):
4 294 836 323(10) = 0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1110 0000 0000 0110 0011
Spaces were used to group digits: for binary, by 4, for decimal, by 3.