What are the required steps to convert base 10 integer
number 110 101 010 180 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;
- 110 101 010 180 ÷ 2 = 55 050 505 090 + 0;
- 55 050 505 090 ÷ 2 = 27 525 252 545 + 0;
- 27 525 252 545 ÷ 2 = 13 762 626 272 + 1;
- 13 762 626 272 ÷ 2 = 6 881 313 136 + 0;
- 6 881 313 136 ÷ 2 = 3 440 656 568 + 0;
- 3 440 656 568 ÷ 2 = 1 720 328 284 + 0;
- 1 720 328 284 ÷ 2 = 860 164 142 + 0;
- 860 164 142 ÷ 2 = 430 082 071 + 0;
- 430 082 071 ÷ 2 = 215 041 035 + 1;
- 215 041 035 ÷ 2 = 107 520 517 + 1;
- 107 520 517 ÷ 2 = 53 760 258 + 1;
- 53 760 258 ÷ 2 = 26 880 129 + 0;
- 26 880 129 ÷ 2 = 13 440 064 + 1;
- 13 440 064 ÷ 2 = 6 720 032 + 0;
- 6 720 032 ÷ 2 = 3 360 016 + 0;
- 3 360 016 ÷ 2 = 1 680 008 + 0;
- 1 680 008 ÷ 2 = 840 004 + 0;
- 840 004 ÷ 2 = 420 002 + 0;
- 420 002 ÷ 2 = 210 001 + 0;
- 210 001 ÷ 2 = 105 000 + 1;
- 105 000 ÷ 2 = 52 500 + 0;
- 52 500 ÷ 2 = 26 250 + 0;
- 26 250 ÷ 2 = 13 125 + 0;
- 13 125 ÷ 2 = 6 562 + 1;
- 6 562 ÷ 2 = 3 281 + 0;
- 3 281 ÷ 2 = 1 640 + 1;
- 1 640 ÷ 2 = 820 + 0;
- 820 ÷ 2 = 410 + 0;
- 410 ÷ 2 = 205 + 0;
- 205 ÷ 2 = 102 + 1;
- 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.
110 101 010 180(10) = 1 1001 1010 0010 1000 1000 0001 0111 0000 0100(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:
110 101 010 180(10) Base 10 integer number converted and written as a signed binary code (in base 2):
110 101 010 180(10) = 0000 0000 0000 0000 0000 0000 0001 1001 1010 0010 1000 1000 0001 0111 0000 0100
Spaces were used to group digits: for binary, by 4, for decimal, by 3.