What are the required steps to convert base 10 integer
number 1 822 976 169 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;
- 1 822 976 169 ÷ 2 = 911 488 084 + 1;
- 911 488 084 ÷ 2 = 455 744 042 + 0;
- 455 744 042 ÷ 2 = 227 872 021 + 0;
- 227 872 021 ÷ 2 = 113 936 010 + 1;
- 113 936 010 ÷ 2 = 56 968 005 + 0;
- 56 968 005 ÷ 2 = 28 484 002 + 1;
- 28 484 002 ÷ 2 = 14 242 001 + 0;
- 14 242 001 ÷ 2 = 7 121 000 + 1;
- 7 121 000 ÷ 2 = 3 560 500 + 0;
- 3 560 500 ÷ 2 = 1 780 250 + 0;
- 1 780 250 ÷ 2 = 890 125 + 0;
- 890 125 ÷ 2 = 445 062 + 1;
- 445 062 ÷ 2 = 222 531 + 0;
- 222 531 ÷ 2 = 111 265 + 1;
- 111 265 ÷ 2 = 55 632 + 1;
- 55 632 ÷ 2 = 27 816 + 0;
- 27 816 ÷ 2 = 13 908 + 0;
- 13 908 ÷ 2 = 6 954 + 0;
- 6 954 ÷ 2 = 3 477 + 0;
- 3 477 ÷ 2 = 1 738 + 1;
- 1 738 ÷ 2 = 869 + 0;
- 869 ÷ 2 = 434 + 1;
- 434 ÷ 2 = 217 + 0;
- 217 ÷ 2 = 108 + 1;
- 108 ÷ 2 = 54 + 0;
- 54 ÷ 2 = 27 + 0;
- 27 ÷ 2 = 13 + 1;
- 13 ÷ 2 = 6 + 1;
- 6 ÷ 2 = 3 + 0;
- 3 ÷ 2 = 1 + 1;
- 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.
1 822 976 169(10) = 110 1100 1010 1000 0110 1000 1010 1001(2)
3. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 31.
- 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, 31,
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:
1 822 976 169(10) Base 10 integer number converted and written as a signed binary code (in base 2):
1 822 976 169(10) = 0110 1100 1010 1000 0110 1000 1010 1001
Spaces were used to group digits: for binary, by 4, for decimal, by 3.