What are the required steps to convert base 10 integer
number 3 242 733 935 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;
- 3 242 733 935 ÷ 2 = 1 621 366 967 + 1;
- 1 621 366 967 ÷ 2 = 810 683 483 + 1;
- 810 683 483 ÷ 2 = 405 341 741 + 1;
- 405 341 741 ÷ 2 = 202 670 870 + 1;
- 202 670 870 ÷ 2 = 101 335 435 + 0;
- 101 335 435 ÷ 2 = 50 667 717 + 1;
- 50 667 717 ÷ 2 = 25 333 858 + 1;
- 25 333 858 ÷ 2 = 12 666 929 + 0;
- 12 666 929 ÷ 2 = 6 333 464 + 1;
- 6 333 464 ÷ 2 = 3 166 732 + 0;
- 3 166 732 ÷ 2 = 1 583 366 + 0;
- 1 583 366 ÷ 2 = 791 683 + 0;
- 791 683 ÷ 2 = 395 841 + 1;
- 395 841 ÷ 2 = 197 920 + 1;
- 197 920 ÷ 2 = 98 960 + 0;
- 98 960 ÷ 2 = 49 480 + 0;
- 49 480 ÷ 2 = 24 740 + 0;
- 24 740 ÷ 2 = 12 370 + 0;
- 12 370 ÷ 2 = 6 185 + 0;
- 6 185 ÷ 2 = 3 092 + 1;
- 3 092 ÷ 2 = 1 546 + 0;
- 1 546 ÷ 2 = 773 + 0;
- 773 ÷ 2 = 386 + 1;
- 386 ÷ 2 = 193 + 0;
- 193 ÷ 2 = 96 + 1;
- 96 ÷ 2 = 48 + 0;
- 48 ÷ 2 = 24 + 0;
- 24 ÷ 2 = 12 + 0;
- 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.
3 242 733 935(10) = 1100 0001 0100 1000 0011 0001 0110 1111(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:
3 242 733 935(10) Base 10 integer number converted and written as a signed binary code (in base 2):
3 242 733 935(10) = 0000 0000 0000 0000 0000 0000 0000 0000 1100 0001 0100 1000 0011 0001 0110 1111
Spaces were used to group digits: for binary, by 4, for decimal, by 3.