c program to swap two numbers using call by reference

1#include <stdio.h>
2 
3void swap(int*, int*);
4 
5int main()
6{
7   int x, y;
8 
9   printf("Enter the value of x and y\n");
10   scanf("%d%d",&x,&y);
11 
12   printf("Before Swapping\nx = %d\ny = %d\n", x, y);
13 
14   swap(&x, &y); 
15 
16   printf("After Swapping\nx = %d\ny = %d\n", x, y);
17 
18   return 0;
19}
20 
21void swap(int *a, int *b)
22{
23   int temp;
24 
25   temp = *b;
26   *b = *a;
27   *a = temp;   
28}
29