How watch point works internally in GDB ?

Question

I eager to know how watch point works in detail ?

Answer 1

Watch point is very useful when programmer is not able to locate which piece of code is doing wrong.
There are two types of watch point 1. Software watch point and 2. Hardware watch point.
when you are not sure that in which flow or in which iteration data is being corrupted then only two option left either do manually or use watch point.
when you put a watch point on a variable it consider that variable till only its scope. if you have put watch point for a variable which has auto scope. Watch point leave the variable when it goes out of scope. when a program get executed completely then all variables of a program want out of scope that's why you have to apply watch point if you are going to rerun.