write a program to swap the given two variables numbers without and with using third variable in C language?

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Swap the given two variables without third variable

  The below program clear about the swapping the two variables without using the third variable.

          #include<stdio.h>
                 main()
                {
                        int a=5,b=10;

                              a = a+b;
                              b = a-b;
                              a =a-b;

                     printf("After swap the given number %d  %d\n",a,b);

                 }

        Output :-
                           a = 10, b = 5 

Swap the given two variables with third variable
        
      This program is clear the swapping the given variables with using the third variable.

                 #include<stdio.h>
                 main()
                {
                        int a=20,b=10,temp;

                              temp = a;
                              a = b;
                              b = temp;

                     printf("After swap the given number %d  %d\n",a,b);

                 }

        Output :-
                           a = 10, b =20