What are the required steps to convert base 10 integer
number 58 899 835 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;
- 58 899 835 ÷ 2 = 29 449 917 + 1;
- 29 449 917 ÷ 2 = 14 724 958 + 1;
- 14 724 958 ÷ 2 = 7 362 479 + 0;
- 7 362 479 ÷ 2 = 3 681 239 + 1;
- 3 681 239 ÷ 2 = 1 840 619 + 1;
- 1 840 619 ÷ 2 = 920 309 + 1;
- 920 309 ÷ 2 = 460 154 + 1;
- 460 154 ÷ 2 = 230 077 + 0;
- 230 077 ÷ 2 = 115 038 + 1;
- 115 038 ÷ 2 = 57 519 + 0;
- 57 519 ÷ 2 = 28 759 + 1;
- 28 759 ÷ 2 = 14 379 + 1;
- 14 379 ÷ 2 = 7 189 + 1;
- 7 189 ÷ 2 = 3 594 + 1;
- 3 594 ÷ 2 = 1 797 + 0;
- 1 797 ÷ 2 = 898 + 1;
- 898 ÷ 2 = 449 + 0;
- 449 ÷ 2 = 224 + 1;
- 224 ÷ 2 = 112 + 0;
- 112 ÷ 2 = 56 + 0;
- 56 ÷ 2 = 28 + 0;
- 28 ÷ 2 = 14 + 0;
- 14 ÷ 2 = 7 + 0;
- 7 ÷ 2 = 3 + 1;
- 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.
58 899 835(10) = 11 1000 0010 1011 1101 0111 1011(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:
58 899 835(10) Base 10 integer number converted and written as a signed binary code (in base 2):
58 899 835(10) = 0000 0011 1000 0010 1011 1101 0111 1011
Spaces were used to group digits: for binary, by 4, for decimal, by 3.