What are the required steps to convert base 10 integer
number 55 975 828 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;
- 55 975 828 ÷ 2 = 27 987 914 + 0;
- 27 987 914 ÷ 2 = 13 993 957 + 0;
- 13 993 957 ÷ 2 = 6 996 978 + 1;
- 6 996 978 ÷ 2 = 3 498 489 + 0;
- 3 498 489 ÷ 2 = 1 749 244 + 1;
- 1 749 244 ÷ 2 = 874 622 + 0;
- 874 622 ÷ 2 = 437 311 + 0;
- 437 311 ÷ 2 = 218 655 + 1;
- 218 655 ÷ 2 = 109 327 + 1;
- 109 327 ÷ 2 = 54 663 + 1;
- 54 663 ÷ 2 = 27 331 + 1;
- 27 331 ÷ 2 = 13 665 + 1;
- 13 665 ÷ 2 = 6 832 + 1;
- 6 832 ÷ 2 = 3 416 + 0;
- 3 416 ÷ 2 = 1 708 + 0;
- 1 708 ÷ 2 = 854 + 0;
- 854 ÷ 2 = 427 + 0;
- 427 ÷ 2 = 213 + 1;
- 213 ÷ 2 = 106 + 1;
- 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.
55 975 828(10) = 11 0101 0110 0001 1111 1001 0100(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 26.
- 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, 26,
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:
55 975 828(10) Base 10 integer number converted and written as a signed binary code (in base 2):
55 975 828(10) = 0000 0011 0101 0110 0001 1111 1001 0100
Spaces were used to group digits: for binary, by 4, for decimal, by 3.