What are the required steps to convert base 10 integer
number 16 842 776 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;
- 16 842 776 ÷ 2 = 8 421 388 + 0;
- 8 421 388 ÷ 2 = 4 210 694 + 0;
- 4 210 694 ÷ 2 = 2 105 347 + 0;
- 2 105 347 ÷ 2 = 1 052 673 + 1;
- 1 052 673 ÷ 2 = 526 336 + 1;
- 526 336 ÷ 2 = 263 168 + 0;
- 263 168 ÷ 2 = 131 584 + 0;
- 131 584 ÷ 2 = 65 792 + 0;
- 65 792 ÷ 2 = 32 896 + 0;
- 32 896 ÷ 2 = 16 448 + 0;
- 16 448 ÷ 2 = 8 224 + 0;
- 8 224 ÷ 2 = 4 112 + 0;
- 4 112 ÷ 2 = 2 056 + 0;
- 2 056 ÷ 2 = 1 028 + 0;
- 1 028 ÷ 2 = 514 + 0;
- 514 ÷ 2 = 257 + 0;
- 257 ÷ 2 = 128 + 1;
- 128 ÷ 2 = 64 + 0;
- 64 ÷ 2 = 32 + 0;
- 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.
16 842 776(10) = 1 0000 0001 0000 0000 0001 1000(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 25.
- 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, 25,
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:
16 842 776(10) Base 10 integer number converted and written as a signed binary code (in base 2):
16 842 776(10) = 0000 0001 0000 0001 0000 0000 0001 1000
Spaces were used to group digits: for binary, by 4, for decimal, by 3.