Program to Show Call by Reference

#include <stdio.h>
swap (int *, int *);
main()
{
int a, b;
printf("\nEnter value of a & b: ");
scanf("%d %d", &a, &b);
printf("\nBefore Swapping:\n");
printf("\na = %d\n\nb = %d\n", a, b);
swap(&a, &b);
printf("\nAfter Swapping:\n");
printf("\na = %d\n\nb = %d", a, b);
getch();
}
swap (int *x, int *y)
{
int temp;
temp = *x;
*x = *y;
*y = temp;
}