Swap function in C language (using call by Reference)

Swap function in C language ( using call by reference.)

Program :-

    #include <stdio.h>
    
    void swap(int*, int*);

    int main()
    {
       int x, y;
    
       printf("Enter the value of x and y\n");
       scanf("%d%d",&x,&y);
    
       printf("Before Swapping\nx = %d\ny = %d\n", x, y);
    
       swap(&x, &y);
    
       printf("After Swapping\nx = %d\ny = %d\n", x, y);
    
       return 0;
    }
    //Swap function definition
    void swap(int *a, int *b)
    {
       int t;
    
       t  = *b;
       *b = *a;
       *a = t;
    }