#include
void swap(int *x, int *y);
int main(void)
{
int i, j;
i = 10;
j = 20;
printf("i and j before swapping: %d %d\n", i, j);
swap(&i, &j); /* pass the addresses of i and j */
printf("i and j after swapping: %d %d\n", i, j);
return 0;
}
void swap(int *x, int *y)
{
int temp;
temp = *x; /* save the value at address x */
*x = *y; /* put y into x */
*y = temp; /* put x into y */
}