Write a program to swap the values of two numbers without using a third variable

Source Code

 #include<stdio.h>

 #include<conio.h>

 int main (int argc, char *argv[])

 {

   clrscr();

   int a,b;

   printf("\n Enter two variables:");

   scanf("%d %d",&a,&b);

   b=a+b;

   a=b-a;

   b=b-a;

   printf("\n The values of a and b are: %d and %d",a,b);

   getch();

 }

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