What are the required steps to convert base 10 integer
number 2 274 002 217 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;
- 2 274 002 217 ÷ 2 = 1 137 001 108 + 1;
- 1 137 001 108 ÷ 2 = 568 500 554 + 0;
- 568 500 554 ÷ 2 = 284 250 277 + 0;
- 284 250 277 ÷ 2 = 142 125 138 + 1;
- 142 125 138 ÷ 2 = 71 062 569 + 0;
- 71 062 569 ÷ 2 = 35 531 284 + 1;
- 35 531 284 ÷ 2 = 17 765 642 + 0;
- 17 765 642 ÷ 2 = 8 882 821 + 0;
- 8 882 821 ÷ 2 = 4 441 410 + 1;
- 4 441 410 ÷ 2 = 2 220 705 + 0;
- 2 220 705 ÷ 2 = 1 110 352 + 1;
- 1 110 352 ÷ 2 = 555 176 + 0;
- 555 176 ÷ 2 = 277 588 + 0;
- 277 588 ÷ 2 = 138 794 + 0;
- 138 794 ÷ 2 = 69 397 + 0;
- 69 397 ÷ 2 = 34 698 + 1;
- 34 698 ÷ 2 = 17 349 + 0;
- 17 349 ÷ 2 = 8 674 + 1;
- 8 674 ÷ 2 = 4 337 + 0;
- 4 337 ÷ 2 = 2 168 + 1;
- 2 168 ÷ 2 = 1 084 + 0;
- 1 084 ÷ 2 = 542 + 0;
- 542 ÷ 2 = 271 + 0;
- 271 ÷ 2 = 135 + 1;
- 135 ÷ 2 = 67 + 1;
- 67 ÷ 2 = 33 + 1;
- 33 ÷ 2 = 16 + 1;
- 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.
2 274 002 217(10) = 1000 0111 1000 1010 1000 0101 0010 1001(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 32.
- 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, 32,
3) so that the first bit (leftmost) could be zero
(we deal with a positive number at this moment)
=== is: 64.
4. Get the positive binary computer representation on 64 bits (8 Bytes):
If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 64:
2 274 002 217(10) Base 10 integer number converted and written as a signed binary code (in base 2):
2 274 002 217(10) = 0000 0000 0000 0000 0000 0000 0000 0000 1000 0111 1000 1010 1000 0101 0010 1001
Spaces were used to group digits: for binary, by 4, for decimal, by 3.