#include <stdio.h>
void swap(int*, int*);
int main(void){
int a,b;
a=10;
b=20;
printf("before swap():a=%d, b=%d\n", a,b);
swap(&a, &b);
printf("after swap(): a=%d, b=%d\n",a,b);
return 0;
}
void swap(int *a, int *b){
int temp;
temp = *a;
*a = *b;
*b = temp;
printf("in swap() : a=%d, b=%d\n", a,b);
}