What are the required steps to convert base 10 integer
number 1 192 949 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;
- 1 192 949 ÷ 2 = 596 474 + 1;
- 596 474 ÷ 2 = 298 237 + 0;
- 298 237 ÷ 2 = 149 118 + 1;
- 149 118 ÷ 2 = 74 559 + 0;
- 74 559 ÷ 2 = 37 279 + 1;
- 37 279 ÷ 2 = 18 639 + 1;
- 18 639 ÷ 2 = 9 319 + 1;
- 9 319 ÷ 2 = 4 659 + 1;
- 4 659 ÷ 2 = 2 329 + 1;
- 2 329 ÷ 2 = 1 164 + 1;
- 1 164 ÷ 2 = 582 + 0;
- 582 ÷ 2 = 291 + 0;
- 291 ÷ 2 = 145 + 1;
- 145 ÷ 2 = 72 + 1;
- 72 ÷ 2 = 36 + 0;
- 36 ÷ 2 = 18 + 0;
- 18 ÷ 2 = 9 + 0;
- 9 ÷ 2 = 4 + 1;
- 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.
1 192 949(10) = 1 0010 0011 0011 1111 0101(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 21.
- 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, 21,
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:
1 192 949(10) Base 10 integer number converted and written as a signed binary code (in base 2):
1 192 949(10) = 0000 0000 0001 0010 0011 0011 1111 0101
Spaces were used to group digits: for binary, by 4, for decimal, by 3.