Program to swap 2 numbers using third number

//Program to swap two numbers using 3rd number
#include<stdio.h>
#include<conio.h>
void main()
{
   int a, b, c;
   clrscr();
   printf("Enter two integers values\n");
   scanf("%d%d", &a, &b);
   // let a = 11, b = 13
   printf("The numbers before swapping are\n");
   // Printing of a = 11 and b = 13
   printf("1st Number = %d\n2nd Number = %d\n\n",a,b);
   c = a ; // c = 11
   a = b ; // a = 13
   b = c ; // b = 11
   printf("The numbers after swapping are\n");
   //Printing of a = 13 and b = 11
   printf("1st Number = %d\n2nd Number = %d",a,b);
   getch();
}