1. write a C program to interchange among two variables without use of temp variable.:

#include

#include

 void main()

  {

   int c,d,temp=0;

   clrscr();

   printf("\n Enter the values of c and d : ");

    scanf("%d%d",&c,&d);

        temp=c;

           c=d;

           d=temp;

  printf("\n After interchanging the value of c and d are : %d %d",c,d);

   getch();

  }

/*Output:

Enter the values of c and d : 45 23

After interchanging the values of c and d are : 23 45