What are the required steps to convert base 10 integer
number 222 443 854 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;
- 222 443 854 ÷ 2 = 111 221 927 + 0;
- 111 221 927 ÷ 2 = 55 610 963 + 1;
- 55 610 963 ÷ 2 = 27 805 481 + 1;
- 27 805 481 ÷ 2 = 13 902 740 + 1;
- 13 902 740 ÷ 2 = 6 951 370 + 0;
- 6 951 370 ÷ 2 = 3 475 685 + 0;
- 3 475 685 ÷ 2 = 1 737 842 + 1;
- 1 737 842 ÷ 2 = 868 921 + 0;
- 868 921 ÷ 2 = 434 460 + 1;
- 434 460 ÷ 2 = 217 230 + 0;
- 217 230 ÷ 2 = 108 615 + 0;
- 108 615 ÷ 2 = 54 307 + 1;
- 54 307 ÷ 2 = 27 153 + 1;
- 27 153 ÷ 2 = 13 576 + 1;
- 13 576 ÷ 2 = 6 788 + 0;
- 6 788 ÷ 2 = 3 394 + 0;
- 3 394 ÷ 2 = 1 697 + 0;
- 1 697 ÷ 2 = 848 + 1;
- 848 ÷ 2 = 424 + 0;
- 424 ÷ 2 = 212 + 0;
- 212 ÷ 2 = 106 + 0;
- 106 ÷ 2 = 53 + 0;
- 53 ÷ 2 = 26 + 1;
- 26 ÷ 2 = 13 + 0;
- 13 ÷ 2 = 6 + 1;
- 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.
222 443 854(10) = 1101 0100 0010 0011 1001 0100 1110(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 28.
- 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, 28,
3) so that the first bit (leftmost) could be zero
(we deal with a positive number at this moment)
=== is: 32.
4. 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:
222 443 854(10) Base 10 integer number converted and written as a signed binary code (in base 2):
222 443 854(10) = 0000 1101 0100 0010 0011 1001 0100 1110
Spaces were used to group digits: for binary, by 4, for decimal, by 3.