Different Types of Swapping in C

            Swapping is a interchanging of variable. Consider variable a and b  if        a=23,b=47. After swapping a=47,b=23

       

         1)     Swapping of two numbers in c using third variable

           #include<stdio.h>

        main()

        {

           int a=23,b=47,temp;

           printf("Before Swap. a: %d, b: %d\n", a, b);

              temp=a;

              a=b;

              b=temp;

   

           printf("After Swap.  a: %d, b: %d\n", a, b);

           return 0;

        }

        

       output

       Before Swap. a: 23, b: 47

       After Swap.  a: 47, b: 23

          2)    Swapping of two numbers without using third variable

               #include<stdio.h>

           main()

           {

             int a=23,b=47;

             printf("Before Swap. a: %d, b: %d\n", a, b);

               a=a+b;

               b=a-b;

               a=a-b;

            printf("After Swap.  a: %d, b: %d\n", a, b);

            return 0;

           }

               Output

             Before Swap. a: 23, b: 47

             After Swap.  a: 47, b: 23

           3)    Swapping of two variables using bitwise operation

        #include<stdio.h>

        main()

        {

            int a = 23, b = 47;

  

            printf("Before Swap. a: %d, b: %d\n", a, b);

            a ^= b;

            b ^= a;

            a ^= b;

           printf("After Swap.  a: %d, b: %d\n", a, b);

           return 0;

}

        output

       Before Swap. a: 23, b: 47

       After Swap.  a: 47, b: 23