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 :

lea         


        

Answer 1

Assume initial address of p = 0xfcf0, *p = 1, b = 2, value @ 0xfcf4 = 5 and value @ 0xfcf8 = 15

The macro will expand as

least = ((*p++) <= (b) ? (*p++) : (b));

i.e least = ((1) <= (2) ? (*p++) : (b));

since *p is incremented twice.

1) *p++ --> now p will point to address 0xfcf4;

2) *p++ --> now p will point to address 0xfcf8;

So least = 15; (the values in the address 0xfcf8). Hope it helps.