Wap in ‘C’ to swap two numbers with the help of a third variable.

#include<stdio.h>
#include<conio.h>
void main ( )
   { 
      int a,b,c;
      printf("Enter two numbers");
      scanf("%d %d ", &a,&b);
      printf("\n before swapping a=%d b=%d ",a,b);
      c=a;
      a=b;
      b=c;
      printf("\n after swapping a=%d b=%d",a,b);
      getch( );
    }