Question

a negative decimal number can be represented in binary form using 1's and 2's complement....what makes the difference?
any related information is helpful.........
thanks in advance..

Answer 1

One's complement have a positive and a negative zero.
Two's complement is the solution to such problem.
Because of this, two's complement have more negative numbers than positives.

Answer 2

lets take
number -5
in binary 5 is 00000101
now 2's complement
copy all the zeros (working from LSB toward the most significant bit) until the first 1 is reached
-5 = 11111011(2's complement)

1's complement
convert all the zeros to 1
00000101
so 1's complement
11111010

Answer 3

exactly 1's complement have two ways to represent zero which lead us to error