What are the required steps to convert base 10 integer
number 1 101 100 790 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;
- 1 101 100 790 ÷ 2 = 550 550 395 + 0;
- 550 550 395 ÷ 2 = 275 275 197 + 1;
- 275 275 197 ÷ 2 = 137 637 598 + 1;
- 137 637 598 ÷ 2 = 68 818 799 + 0;
- 68 818 799 ÷ 2 = 34 409 399 + 1;
- 34 409 399 ÷ 2 = 17 204 699 + 1;
- 17 204 699 ÷ 2 = 8 602 349 + 1;
- 8 602 349 ÷ 2 = 4 301 174 + 1;
- 4 301 174 ÷ 2 = 2 150 587 + 0;
- 2 150 587 ÷ 2 = 1 075 293 + 1;
- 1 075 293 ÷ 2 = 537 646 + 1;
- 537 646 ÷ 2 = 268 823 + 0;
- 268 823 ÷ 2 = 134 411 + 1;
- 134 411 ÷ 2 = 67 205 + 1;
- 67 205 ÷ 2 = 33 602 + 1;
- 33 602 ÷ 2 = 16 801 + 0;
- 16 801 ÷ 2 = 8 400 + 1;
- 8 400 ÷ 2 = 4 200 + 0;
- 4 200 ÷ 2 = 2 100 + 0;
- 2 100 ÷ 2 = 1 050 + 0;
- 1 050 ÷ 2 = 525 + 0;
- 525 ÷ 2 = 262 + 1;
- 262 ÷ 2 = 131 + 0;
- 131 ÷ 2 = 65 + 1;
- 65 ÷ 2 = 32 + 1;
- 32 ÷ 2 = 16 + 0;
- 16 ÷ 2 = 8 + 0;
- 8 ÷ 2 = 4 + 0;
- 4 ÷ 2 = 2 + 0;
- 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.
1 101 100 790(10) = 100 0001 1010 0001 0111 0110 1111 0110(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 31.
- 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, 31,
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:
1 101 100 790(10) Base 10 integer number converted and written as a signed binary code (in base 2):
1 101 100 790(10) = 0100 0001 1010 0001 0111 0110 1111 0110
Spaces were used to group digits: for binary, by 4, for decimal, by 3.