Write a C Program to Swap the values of two variables

/*    Swap the values of two variables using three variable   */

#include<stdio.h>

void main()

{

 int a;

 int b;

 int c;

 printf("Type value of A : ");

 scanf("%i",&a);

 printf("\nType value of b : ");

 scanf("%i",&b);

 c=a;

 a=b;

 b=c;

 printf("A : %i",a);

 printf("\nb : %i",b);

}

/*    Swap the values of two variables without using third variable   */

#include<stdio.h>

void main()

{

 int a;

 int b;

 printf("Type value of A : ");

 scanf("%i",&a);

 printf("\nType value of b : ");

 scanf("%i",&b);

 a=a+b;

 b=a-b;

 a=a-b;

 printf("A : %i",a);

 printf("\nb : %i",b);

}

/* Swap values of two variables using XOR */ 

#include<stdio.h>

void main()

{

 int a;

 int b;

 printf("Type value of A : ");

 scanf("%i",&a);

 printf("\nType value of b : ");

 scanf("%i",&b);

  a ^= b;

  b ^= a;

  a ^= b;

 printf("A : %i",a);

 printf("\nB : %i",b);

}