What are the required steps to convert base 10 integer
number -335 529 328 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:
|-335 529 328| = 335 529 328
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;
- 335 529 328 ÷ 2 = 167 764 664 + 0;
- 167 764 664 ÷ 2 = 83 882 332 + 0;
- 83 882 332 ÷ 2 = 41 941 166 + 0;
- 41 941 166 ÷ 2 = 20 970 583 + 0;
- 20 970 583 ÷ 2 = 10 485 291 + 1;
- 10 485 291 ÷ 2 = 5 242 645 + 1;
- 5 242 645 ÷ 2 = 2 621 322 + 1;
- 2 621 322 ÷ 2 = 1 310 661 + 0;
- 1 310 661 ÷ 2 = 655 330 + 1;
- 655 330 ÷ 2 = 327 665 + 0;
- 327 665 ÷ 2 = 163 832 + 1;
- 163 832 ÷ 2 = 81 916 + 0;
- 81 916 ÷ 2 = 40 958 + 0;
- 40 958 ÷ 2 = 20 479 + 0;
- 20 479 ÷ 2 = 10 239 + 1;
- 10 239 ÷ 2 = 5 119 + 1;
- 5 119 ÷ 2 = 2 559 + 1;
- 2 559 ÷ 2 = 1 279 + 1;
- 1 279 ÷ 2 = 639 + 1;
- 639 ÷ 2 = 319 + 1;
- 319 ÷ 2 = 159 + 1;
- 159 ÷ 2 = 79 + 1;
- 79 ÷ 2 = 39 + 1;
- 39 ÷ 2 = 19 + 1;
- 19 ÷ 2 = 9 + 1;
- 9 ÷ 2 = 4 + 1;
- 4 ÷ 2 = 2 + 0;
- 2 ÷ 2 = 1 + 0;
- 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.
335 529 328(10) = 1 0011 1111 1111 1100 0101 0111 0000(2)
4. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 29.
- 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, 29,
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:
335 529 328(10) = 0001 0011 1111 1111 1100 0101 0111 0000
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...
-335 529 328(10) Base 10 integer number converted and written as a signed binary code (in base 2):
-335 529 328(10) = 1001 0011 1111 1111 1100 0101 0111 0000
Spaces were used to group digits: for binary, by 4, for decimal, by 3.