/*
* function2.c
* basic concepts of functions -- addresses
*/

#include<stdio.h>
int a;  // global variable, visible from anywhere.   

int add(int x, int y) {
   int z = 1;//local variable 
   printf("Address of parameter x is %lu\n",  &x);
   printf("Address of parameter y is %lu\n",  &y);
   printf("Address of local variable z is %lu\n",  &z);
   return x+y+z;
}

void main() {
   a = 1;           
   int b = 2;
   int y = add(a, b); 
   
   printf("Address of a is %lu\n",  &a);
   printf("Address of b is %lu\n",  &b);
   printf("Address of y is %lu\n",  &y);
}

/* program output (system dependent)
Address of parameter x is 6422256
Address of parameter y is 6422260
Address of local variable z is 6422236
Address of a is 4214888
Address of b is 6422284
Address of y is 6422280
*/