SOURCE FILE: floorSpace.cpp

// Example 4.7. Program to display the floor space for a room   

/* Notice here how the if-then-else logic is used to handle a possible error
   in the form of the input. */

#include <iostream>
using namespace std ;

   void directions(void);  // prototypes
   int  GetDim(void);   
   int  area(int, int);   
   
int main(void)   
{   
   int dim1,               // one dimension of the room     
       dim2,               // another dimension of the room 
       FloorSpace;         // area of floor in room         
   
   directions();   

   dim1 = GetDim();   
   dim2 = GetDim();   
      
   // only process positive floor dimensions 
   if ( (dim1 <= 0) || (dim2 <= 0) )      // invalid data 
   {    
   // user types a nonpositive value for dim1 or dim2 
   
      cout << endl ;
      cout << "Sorry, only positive dimensions are allowed.";
      cout << endl ;
      cout << "Please reexecute the program.";
      cout << endl ;
   }   
   else                           // valid data 
   {   
      FloorSpace = area(dim1, dim2);   
      cout << endl << "The floor space is "
           << FloorSpace << " square feet." << endl ;
      cout << endl ;
   }   

   return 0;
}   

//   
// Function to print program directions   
// Pre:  none   
// Post: Program directions have been printed.   
//    
   
void directions(void)   
{   
   cout << endl ;
   cout << "This program will give you the floor space ";
   cout << "in square feet" << endl ;
   cout << "for a room of your choosing." << endl << endl ;
}   
      
//   
// Function to prompt the user for one dimension   
// of a floor and to return that dimension   
// Pre:  The user enters an integer dimension.   
// Post: The function has returned that dimension.   
//    
   
int GetDim(void)   
{   
   int dimension;      // one dimension of floor 
   
   cout << "Type one dimension of the floor in feet:  ";
   cin  >> dimension;
   return dimension;   
}   
   
//   
// Function to calculate the floor space (area of the floor)   
// given two dimensions (length and width).   
// Pre:  dim1 and dim2 are integer dimensions.   
// Post: The function has returned the integer floor space.   
//    
   
int area(int dim1, int dim2)   
{   
   return (dim1 * dim2);   
}