2. Divide the number repeatedly by 2:
Keep track of each remainder.
We stop when we get a quotient that is equal to zero.
- division = quotient + remainder;
- 624 684 ÷ 2 = 312 342 + 0;
- 312 342 ÷ 2 = 156 171 + 0;
- 156 171 ÷ 2 = 78 085 + 1;
- 78 085 ÷ 2 = 39 042 + 1;
- 39 042 ÷ 2 = 19 521 + 0;
- 19 521 ÷ 2 = 9 760 + 1;
- 9 760 ÷ 2 = 4 880 + 0;
- 4 880 ÷ 2 = 2 440 + 0;
- 2 440 ÷ 2 = 1 220 + 0;
- 1 220 ÷ 2 = 610 + 0;
- 610 ÷ 2 = 305 + 0;
- 305 ÷ 2 = 152 + 1;
- 152 ÷ 2 = 76 + 0;
- 76 ÷ 2 = 38 + 0;
- 38 ÷ 2 = 19 + 0;
- 19 ÷ 2 = 9 + 1;
- 9 ÷ 2 = 4 + 1;
- 4 ÷ 2 = 2 + 0;
- 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.
624 684(10) = 1001 1000 1000 0010 1100(2)
4. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 20.
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) indicates 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, 20,
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.
624 684(10) = 0000 0000 0000 1001 1000 1000 0010 1100
6. Get the negative integer number representation. Part 1:
To write the negative integer number on 32 bits (4 Bytes),
as a signed binary in one's complement representation,
... replace all the bits on 0 with 1s and all the bits set on 1 with 0s.
Reverse the digits, flip the digits:
Replace the bits set on 0 with 1s and the bits set on 1 with 0s.
!(0000 0000 0000 1001 1000 1000 0010 1100)
= 1111 1111 1111 0110 0111 0111 1101 0011
7. Get the negative integer number representation. Part 2:
To write the negative integer number on 32 bits (4 Bytes),
as a signed binary in two's complement representation,
add 1 to the number calculated above
1111 1111 1111 0110 0111 0111 1101 0011
(to the signed binary in one's complement representation)
Binary addition carries on a value of 2:
0 + 0 = 0
0 + 1 = 1
1 + 1 = 10
1 + 10 = 11
1 + 11 = 100
Add 1 to the number calculated above
(to the signed binary number in one's complement representation):
-624 684 =
1111 1111 1111 0110 0111 0111 1101 0011 + 1
Number -624 684(10), a signed integer number (with sign), converted from decimal system (from base 10) and written as a signed binary in two's complement representation:
-624 684(10) = 1111 1111 1111 0110 0111 0111 1101 0100
Spaces were used to group digits: for binary, by 4, for decimal, by 3.