What are the required steps to convert base 10 integer
number 110 001 010 040 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;
- 110 001 010 040 ÷ 2 = 55 000 505 020 + 0;
- 55 000 505 020 ÷ 2 = 27 500 252 510 + 0;
- 27 500 252 510 ÷ 2 = 13 750 126 255 + 0;
- 13 750 126 255 ÷ 2 = 6 875 063 127 + 1;
- 6 875 063 127 ÷ 2 = 3 437 531 563 + 1;
- 3 437 531 563 ÷ 2 = 1 718 765 781 + 1;
- 1 718 765 781 ÷ 2 = 859 382 890 + 1;
- 859 382 890 ÷ 2 = 429 691 445 + 0;
- 429 691 445 ÷ 2 = 214 845 722 + 1;
- 214 845 722 ÷ 2 = 107 422 861 + 0;
- 107 422 861 ÷ 2 = 53 711 430 + 1;
- 53 711 430 ÷ 2 = 26 855 715 + 0;
- 26 855 715 ÷ 2 = 13 427 857 + 1;
- 13 427 857 ÷ 2 = 6 713 928 + 1;
- 6 713 928 ÷ 2 = 3 356 964 + 0;
- 3 356 964 ÷ 2 = 1 678 482 + 0;
- 1 678 482 ÷ 2 = 839 241 + 0;
- 839 241 ÷ 2 = 419 620 + 1;
- 419 620 ÷ 2 = 209 810 + 0;
- 209 810 ÷ 2 = 104 905 + 0;
- 104 905 ÷ 2 = 52 452 + 1;
- 52 452 ÷ 2 = 26 226 + 0;
- 26 226 ÷ 2 = 13 113 + 0;
- 13 113 ÷ 2 = 6 556 + 1;
- 6 556 ÷ 2 = 3 278 + 0;
- 3 278 ÷ 2 = 1 639 + 0;
- 1 639 ÷ 2 = 819 + 1;
- 819 ÷ 2 = 409 + 1;
- 409 ÷ 2 = 204 + 1;
- 204 ÷ 2 = 102 + 0;
- 102 ÷ 2 = 51 + 0;
- 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.
110 001 010 040(10) = 1 1001 1001 1100 1001 0010 0011 0101 0111 1000(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) 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, 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:
110 001 010 040(10) Base 10 integer number converted and written as a signed binary code (in base 2):
110 001 010 040(10) = 0000 0000 0000 0000 0000 0000 0001 1001 1001 1100 1001 0010 0011 0101 0111 1000
Spaces were used to group digits: for binary, by 4, for decimal, by 3.