Is “*p = ++(*q)” undefined when p and q point to the same object?

Question

after reading about sequence points, I learned that i = ++i is undefined.

So how about this code:

int i;
int *p = &i;
int *q = &i;
          


        

Answer 1

The expression is the same as i=++i. The only tool that can detect it is your head. In C with power comes responsibility.