SOURCE FILE: floorSpace.cpp

/* 
   Program to display the floor space for a room   

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

#include <iostream>
using namespace std ;

/* ================================== */
/* FUNCTION DECLARATIONS (PROTOTYPES) */
/* ================================== */

void directions(void);
       /* Print directions for using the program. */

int  GetDim(void);   
       /* Prompt the user for one dimension of a floor and 
          return that dimension */

int area(int, int);   

       /* Return the floor space (area of the floor) 
          given two dimensions (length and width). */

/* ================================== */
/* ================================== */

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 
   {    
   // The user typed 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 DEFINITIONS         */
/* ================================== */


/* ================================== */
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 ;
}   
/* ================================== */
      

/* ================================== */
int GetDim(void)   
{   
   int dimension;      // one dimension of floor 
   
   cout << "Type one dimension of the floor in feet:  ";
   cin  >> dimension;
   return dimension;   
}   
/* ================================== */
   
   
/* ================================== */
int area(int dim1, int dim2)   
{   
   return (dim1 * dim2);   
}   
/* ================================== */