main()
{
   int start=1,i=1,no=0,sum=0;
   clrscr();
   printf ("\nEnter number of terms to be added:-> ");
   scanf("%d",&no);
   for (i=1;i<=no;i++)
   {
      if (i%2!=0)
      {
         sum+=start;
         if (i==1)
            printf ("%d",start);
         else
            printf ("+%d",start);
      }
      else
      {
         sum-=start;
         printf ("-%d",start);
      }
      start+=2;
   }
   printf ("=%d",sum);
   getch();
}