#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);
}