#include <iostream.h>
#include <math.h>


void main (void) {

   double length, width, height;

   for (;;) {

     // prompt user for and read the input quamtities
     cout << endl // space before prompt
          << "Please enter roof length, width and height (zeroes to exit): ";
     cin >> length >> width >> height;

     if ((length == 0) && (width == 0) && (height == 0)) {
       return;
     }

     if (dimensions_valid(length, width, height)) {

       cout << endl
            << "The area of the roof is " << roof_area (length, width, height)
            << " square units." << endl
            << "The roof requites " << ridge_length (length, width, height)
            << " linear units of capping." << endl;

     } else {

        cout << "Those values are invalid - no computations performed." << endl;
     }

   } // end for (;;)

}