What are the required steps to convert base 10 integer
number -754 572 300 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:
|-754 572 300| = 754 572 300
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;
- 754 572 300 ÷ 2 = 377 286 150 + 0;
- 377 286 150 ÷ 2 = 188 643 075 + 0;
- 188 643 075 ÷ 2 = 94 321 537 + 1;
- 94 321 537 ÷ 2 = 47 160 768 + 1;
- 47 160 768 ÷ 2 = 23 580 384 + 0;
- 23 580 384 ÷ 2 = 11 790 192 + 0;
- 11 790 192 ÷ 2 = 5 895 096 + 0;
- 5 895 096 ÷ 2 = 2 947 548 + 0;
- 2 947 548 ÷ 2 = 1 473 774 + 0;
- 1 473 774 ÷ 2 = 736 887 + 0;
- 736 887 ÷ 2 = 368 443 + 1;
- 368 443 ÷ 2 = 184 221 + 1;
- 184 221 ÷ 2 = 92 110 + 1;
- 92 110 ÷ 2 = 46 055 + 0;
- 46 055 ÷ 2 = 23 027 + 1;
- 23 027 ÷ 2 = 11 513 + 1;
- 11 513 ÷ 2 = 5 756 + 1;
- 5 756 ÷ 2 = 2 878 + 0;
- 2 878 ÷ 2 = 1 439 + 0;
- 1 439 ÷ 2 = 719 + 1;
- 719 ÷ 2 = 359 + 1;
- 359 ÷ 2 = 179 + 1;
- 179 ÷ 2 = 89 + 1;
- 89 ÷ 2 = 44 + 1;
- 44 ÷ 2 = 22 + 0;
- 22 ÷ 2 = 11 + 0;
- 11 ÷ 2 = 5 + 1;
- 5 ÷ 2 = 2 + 1;
- 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.
754 572 300(10) = 10 1100 1111 1001 1101 1100 0000 1100(2)
4. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 30.
- 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, 30,
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:
754 572 300(10) = 0010 1100 1111 1001 1101 1100 0000 1100
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...
-754 572 300(10) Base 10 integer number converted and written as a signed binary code (in base 2):
-754 572 300(10) = 1010 1100 1111 1001 1101 1100 0000 1100
Spaces were used to group digits: for binary, by 4, for decimal, by 3.