Swapping in C

Using Third variable:-

#include <stdio.h>
#include<conio.h>
void main()
{
int x,y,temp;

   printf("Enter the two integers\n");
   scanf("%d %d",&x,&y);

   printf("Before Swapping\nx = %d\ny = %d\n",x,y);
   temp = x;
   x    = y;
   y    = temp;
   printf("After Swapping\nx = %d\ny = %d\n",x,y);
}

Without using Third variable:-

#include <stdio.h>

#include<conio.h>

void main()

{

int x,y;

   printf("Enter two integers:\n");

   scanf("%d%d",&x,&y);

   x = x + y;

   y = x - y;

   x = x - y;

   printf("x = %d\ny= %d\n",x,y);

}

Using Reference

#include <stdio.h>

#include<conio.h>

void main()

{

   int x, y, *a, *b, temp;

    printf("Enter the value of x and y\n");

   scanf("%d%d", &x, &y);

   printf("Before Swapping\nx = %d\ny = %d\n", x, y);

   a = &x;

   b = &y;

   temp = *b;

   *b   = *a;

   *a   = temp;

 printf("After Swapping\nx = %d\ny = %d\n", x, y);

 getch();

}