Call by reference swap

#include <stdio.h>
#include <conio.h>

void swap(int *x,int *y)

{
     int temp;
     temp = *x;
     *x=*y;
     *y=temp;
     printf("swapped values are a= %d and b = %d",*x,*y);
}

void main()

{
     int a = 7, b = 4;

     swap(&a,&b);

     printf("Original values are a= %d and b = %d",a,b);

     printf("The values after swap are a = %d,b = %d",a,b);


     getch();
}