Shifting an 8-bit twos complement value to the right by seven positions is a simple way to extract and test the sign bit.

Question

Quizplus · Accepted Answer

When an 8-bit twos complement value is shifted right by seven positions, the sign bit will be the only bit remaining in the result. If the sign bit is 1, the original value was negative, and if it is 0, the original value was positive. Therefore, this is a simple way to extract and test the sign bit.

Shifting an 8-Bit Twos Complement Value to the Right by Seven