What's the side effect of the following macro in C ? Embedded C

Question

#define MIN(A,B) ((A) <=  (B) ? (A) : (B))

this is the macro , I was asked what's the side effect if I used the following :

least = MIN(*p++, b);

Note: This was embedded c question

Answer 1

It evaluates p++ twice. Also, since the first evaluation changes p, the second time around it will point to a different element. So the returned value will be *(initialp + 1) or b.

You should try it yourself.