#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);
}