What are the required steps to convert base 10 integer
number -1 714 611 539 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. Start with the positive version of the number:
|-1 714 611 539| = 1 714 611 539
2. 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;
- 1 714 611 539 ÷ 2 = 857 305 769 + 1;
- 857 305 769 ÷ 2 = 428 652 884 + 1;
- 428 652 884 ÷ 2 = 214 326 442 + 0;
- 214 326 442 ÷ 2 = 107 163 221 + 0;
- 107 163 221 ÷ 2 = 53 581 610 + 1;
- 53 581 610 ÷ 2 = 26 790 805 + 0;
- 26 790 805 ÷ 2 = 13 395 402 + 1;
- 13 395 402 ÷ 2 = 6 697 701 + 0;
- 6 697 701 ÷ 2 = 3 348 850 + 1;
- 3 348 850 ÷ 2 = 1 674 425 + 0;
- 1 674 425 ÷ 2 = 837 212 + 1;
- 837 212 ÷ 2 = 418 606 + 0;
- 418 606 ÷ 2 = 209 303 + 0;
- 209 303 ÷ 2 = 104 651 + 1;
- 104 651 ÷ 2 = 52 325 + 1;
- 52 325 ÷ 2 = 26 162 + 1;
- 26 162 ÷ 2 = 13 081 + 0;
- 13 081 ÷ 2 = 6 540 + 1;
- 6 540 ÷ 2 = 3 270 + 0;
- 3 270 ÷ 2 = 1 635 + 0;
- 1 635 ÷ 2 = 817 + 1;
- 817 ÷ 2 = 408 + 1;
- 408 ÷ 2 = 204 + 0;
- 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;
3. Construct the base 2 representation of the positive number:
Take all the remainders starting from the bottom of the list constructed above.
1 714 611 539(10) = 110 0110 0011 0010 1110 0101 0101 0011(2)
4. 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.
5. 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:
1 714 611 539(10) = 0110 0110 0011 0010 1110 0101 0101 0011
6. Get the negative integer number representation:
To get the negative integer number representation on 32 bits (4 Bytes),
... change the first bit (the leftmost), from 0 to 1...
-1 714 611 539(10) Base 10 integer number converted and written as a signed binary code (in base 2):
-1 714 611 539(10) = 1110 0110 0011 0010 1110 0101 0101 0011
Spaces were used to group digits: for binary, by 4, for decimal, by 3.