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