What are the required steps to convert base 10 integer
number -736 048 984 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:
|-736 048 984| = 736 048 984
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;
- 736 048 984 ÷ 2 = 368 024 492 + 0;
- 368 024 492 ÷ 2 = 184 012 246 + 0;
- 184 012 246 ÷ 2 = 92 006 123 + 0;
- 92 006 123 ÷ 2 = 46 003 061 + 1;
- 46 003 061 ÷ 2 = 23 001 530 + 1;
- 23 001 530 ÷ 2 = 11 500 765 + 0;
- 11 500 765 ÷ 2 = 5 750 382 + 1;
- 5 750 382 ÷ 2 = 2 875 191 + 0;
- 2 875 191 ÷ 2 = 1 437 595 + 1;
- 1 437 595 ÷ 2 = 718 797 + 1;
- 718 797 ÷ 2 = 359 398 + 1;
- 359 398 ÷ 2 = 179 699 + 0;
- 179 699 ÷ 2 = 89 849 + 1;
- 89 849 ÷ 2 = 44 924 + 1;
- 44 924 ÷ 2 = 22 462 + 0;
- 22 462 ÷ 2 = 11 231 + 0;
- 11 231 ÷ 2 = 5 615 + 1;
- 5 615 ÷ 2 = 2 807 + 1;
- 2 807 ÷ 2 = 1 403 + 1;
- 1 403 ÷ 2 = 701 + 1;
- 701 ÷ 2 = 350 + 1;
- 350 ÷ 2 = 175 + 0;
- 175 ÷ 2 = 87 + 1;
- 87 ÷ 2 = 43 + 1;
- 43 ÷ 2 = 21 + 1;
- 21 ÷ 2 = 10 + 1;
- 10 ÷ 2 = 5 + 0;
- 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.
736 048 984(10) = 10 1011 1101 1111 0011 0111 0101 1000(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:
736 048 984(10) = 0010 1011 1101 1111 0011 0111 0101 1000
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...
-736 048 984(10) Base 10 integer number converted and written as a signed binary code (in base 2):
-736 048 984(10) = 1010 1011 1101 1111 0011 0111 0101 1000
Spaces were used to group digits: for binary, by 4, for decimal, by 3.