negative
Be sure that you understand this: It is by happy coincidence that the high order bit of a two's complement integer is 0 for positive and 1 for negative. But, to create the two's complement representation of the negative of a number you must "reflect, add one".
Changing the sign bit by itself will not work.
To convert N bits of two's complement representation into decimal representation:
The number represented by 1001 is negative (since the "sign bit" is one), so complement:
1001 → 0110 + 1 → 0111
Convert the result to decimal: 0111 = 710
.
Add a negative sign: -710.
So (in 4-bit two's complement representation) 1001 represents -710.
What is the decimal representation of this 8-bit two's complement integer: 1001 1111