swapping-without-3rd-var.c

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

 a = 10;
 b = 5;

 printf("Value of a before swapping= %d\n",a);
 printf("Value of b before swapping= %d\n", b);

  a = a + b;
// a = 15 

  b = a - b;
 // b = 15 - 5 = 10 

  a = a - b;
 // a = 15 - 10 = 5

  printf("Value of a after swapping= %d\n", a);
  printf("Value of b after swapping=  %d\n", b);

    return 0;
}