What are the required steps to convert base 10 integer
number 4 464 565 326 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;
- 4 464 565 326 ÷ 2 = 2 232 282 663 + 0;
- 2 232 282 663 ÷ 2 = 1 116 141 331 + 1;
- 1 116 141 331 ÷ 2 = 558 070 665 + 1;
- 558 070 665 ÷ 2 = 279 035 332 + 1;
- 279 035 332 ÷ 2 = 139 517 666 + 0;
- 139 517 666 ÷ 2 = 69 758 833 + 0;
- 69 758 833 ÷ 2 = 34 879 416 + 1;
- 34 879 416 ÷ 2 = 17 439 708 + 0;
- 17 439 708 ÷ 2 = 8 719 854 + 0;
- 8 719 854 ÷ 2 = 4 359 927 + 0;
- 4 359 927 ÷ 2 = 2 179 963 + 1;
- 2 179 963 ÷ 2 = 1 089 981 + 1;
- 1 089 981 ÷ 2 = 544 990 + 1;
- 544 990 ÷ 2 = 272 495 + 0;
- 272 495 ÷ 2 = 136 247 + 1;
- 136 247 ÷ 2 = 68 123 + 1;
- 68 123 ÷ 2 = 34 061 + 1;
- 34 061 ÷ 2 = 17 030 + 1;
- 17 030 ÷ 2 = 8 515 + 0;
- 8 515 ÷ 2 = 4 257 + 1;
- 4 257 ÷ 2 = 2 128 + 1;
- 2 128 ÷ 2 = 1 064 + 0;
- 1 064 ÷ 2 = 532 + 0;
- 532 ÷ 2 = 266 + 0;
- 266 ÷ 2 = 133 + 0;
- 133 ÷ 2 = 66 + 1;
- 66 ÷ 2 = 33 + 0;
- 33 ÷ 2 = 16 + 1;
- 16 ÷ 2 = 8 + 0;
- 8 ÷ 2 = 4 + 0;
- 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.
4 464 565 326(10) = 1 0000 1010 0001 1011 1101 1100 0100 1110(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 33.
- 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, 33,
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:
4 464 565 326(10) Base 10 integer number converted and written as a signed binary code (in base 2):
4 464 565 326(10) = 0000 0000 0000 0000 0000 0000 0000 0001 0000 1010 0001 1011 1101 1100 0100 1110
Spaces were used to group digits: for binary, by 4, for decimal, by 3.