What are the required steps to convert base 10 integer
number 44 644 667 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;
- 44 644 667 ÷ 2 = 22 322 333 + 1;
- 22 322 333 ÷ 2 = 11 161 166 + 1;
- 11 161 166 ÷ 2 = 5 580 583 + 0;
- 5 580 583 ÷ 2 = 2 790 291 + 1;
- 2 790 291 ÷ 2 = 1 395 145 + 1;
- 1 395 145 ÷ 2 = 697 572 + 1;
- 697 572 ÷ 2 = 348 786 + 0;
- 348 786 ÷ 2 = 174 393 + 0;
- 174 393 ÷ 2 = 87 196 + 1;
- 87 196 ÷ 2 = 43 598 + 0;
- 43 598 ÷ 2 = 21 799 + 0;
- 21 799 ÷ 2 = 10 899 + 1;
- 10 899 ÷ 2 = 5 449 + 1;
- 5 449 ÷ 2 = 2 724 + 1;
- 2 724 ÷ 2 = 1 362 + 0;
- 1 362 ÷ 2 = 681 + 0;
- 681 ÷ 2 = 340 + 1;
- 340 ÷ 2 = 170 + 0;
- 170 ÷ 2 = 85 + 0;
- 85 ÷ 2 = 42 + 1;
- 42 ÷ 2 = 21 + 0;
- 21 ÷ 2 = 10 + 1;
- 10 ÷ 2 = 5 + 0;
- 5 ÷ 2 = 2 + 1;
- 2 ÷ 2 = 1 + 0;
- 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.
44 644 667(10) = 10 1010 1001 0011 1001 0011 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:
44 644 667(10) Base 10 integer number converted and written as a signed binary code (in base 2):
44 644 667(10) = 0000 0010 1010 1001 0011 1001 0011 1011
Spaces were used to group digits: for binary, by 4, for decimal, by 3.