while(fabs(term) > TRUNCATION)
       {
	 term *= -x/((double) n);
	 sum  += term;
	 n++;
       } // end while loop
     cout << "x = " << x   << " exp = " << exp(-x) <<"series = "
          << sum  << " number of terms =" << n << endl;
   } // end of for() loop

   cout << endl;           // a final line shift on output

}  /*    End: function main() */