Program to swap two numbers

Program to swap two numbers with address and pointers. Again, a necessary program for all amateur CSE students.

#include<stdio.h>
void swap(int *x,int *y)
{
 int temp;
 temp=*x;
 *x=*y;
 *y=temp;
}
void main()
{
  int a,b;
  printf("Enter the number a:");
  scanf("%d",&a);
  printf("\n Enter the number b:");
  scanf("%d",&b);
  swap(&a,&b);
  printf("\n a contain %d",a);
  printf("\n b contain %d",b);
}