Computer Science for IGCSE & O level - Data Representation (Section 16 - No. 27)
What is the fundamental principle that allows subtraction to be performed using addition in two's complement?
Inverting the bits and adding 1.
Using a separate sign bit.
Adding the positive and negative versions.
Ignoring the most significant bit.
Paliwanag
The key is inverting the bits and adding 1 to perform subtraction via addition.