Swapping of Two Number in C

Let's make a  program in C Language to swap two number in one line

              #include<stdio.h>

             #include<conio.h>

             void main()

                   {

                      int a=10;

                      int b=20;

                      b=a+b-(a=b);

                      printf("%d %d",a,b);

                    }

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