swap 2 variables

/* Swapping using 3rd variable */

#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b,c;
    printf("enter the values of a,b");
    scanf("%d%d",&a,&b);
    c=a;
    a=b;
    b=c;
    printf(" after swapping a,b %d    %d",a,b);
    getche();
}


/* Swapping without using 3rd variable */
 
#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b;
    printf("enter the values of a,b");
    scanf("%d%d",&a,&b);
    a=a+b;
    b=a-b;
    a=a-b;
    printf(" after swapping a,b %d    %d",a,b);
    getche();
}