// inherit14.cpp  		By: Aiman Hanna -  ©1993-2002 Aiman Hanna

// This program concerns of Access Rights. (No new ideas are introduced in this program.) 
// Notice the private sections in the header file.
// Note that this program is not working. Why?
// Key Points:  	1) When should we declare functions or data as private?
//		2) Who has the right to access private sections of any class?
// This program does not work. Why?
 
#include "inherit14.h"

// Definition of Vehicle's member functions

Vehicle::Vehicle( avl_colors clr, int cyl )
{      
 cout << " Vehicle...Executing the constructor of the Vehicle class. " << "\n";
	color = clr;	     
	numcyl = cyl;	    
} 


void Vehicle::ShowInfo( void )
{
	// Is the following information enough?
	cout << " Vehicle....Here is all the known information: " << "\n";	
	cout << " The vehcile color is: " << GetColor( ) << ",\n";
	cout << " and the number of cylinders is: " << GetNumCyl( )  << "\n\n\n";

}





int Vehicle::GetNumCyl( void )
{
 return numcyl;
}


char* Vehicle::GetColor( void )
{
// The following switch statement is needed in order to show the color as 
// a string; otherwise an integer value ( 0, 1, 2 or 3 ) will return 
// instead of ( red, black, white or green ), as avl_colors is an enum type.
 switch ( color )
 {
  case red:    return "red";  
  case black:  return "black";
  case white:  return "white";
  case green:  return "green";
 }
return "unknown";
}



// Define Bus's member functions

Bus::Bus( avl_colors clr, int cyl, yes_no bar ) 
{
 cout << " Bus...Executing the constructor of the Bus class. " << "\n";

 color = clr;	     
 numcyl = cyl;	    
 barexist = bar;

}



void Bus::ShowInfo( void )
{
 // Bus had to redefine this function to include its specific information
 cout << " Bus...Here is all the needed information: " << "\n";
 cout << " The bus color is: " << GetColor( ) << ",\n";
 cout << " the number of cylinders is: " << GetNumCyl( )  << ",\n";
 if ( HasBar( ) == yes )
 	cout << " and the bus has a bar. " << "\n\n\n";
 else
	cout << " and the bus does not have a bar. " << "\n\n\n";
}



yes_no Bus::HasBar ( void )
{
 return barexist;
}





// Define Van's mamber functions

Van::Van( avl_colors clr, int cyl, yes_no tur )
{
 cout << " Van...Executing the constructor of the Van class. " << "\n\n\n";

 color = clr;	     
 numcyl = cyl;	 
 turbo = tur;
}



void Van::ShowInfo( void )
{
 // Van had to redefine this function to include its specific information
 cout << " Van...Here is all the needed information: " << "\n";
 cout << " The van color is: " << GetColor( ) << ",\n";
 cout << " the number of cylinders is: " << GetNumCyl( )  << ",\n";
 if ( IsTurbo( ) == yes )
 	cout << " and the van is turbo " << "\n\n\n";
 else
	cout << " and the van is not turbo. " << "\n\n\n";
}


yes_no Van::IsTurbo( void )
{
return turbo;
}





int main( void )
{
// Create object from all the classes

cout << " Creating a Vehicle object *********************** " << "\n";
Vehicle vec1( red, 4 );
cout << " ############################################### " << "\n";

cout << " \n Creating a Bus object *********************** " << "\n";
Bus bs1( white, 12, yes );
cout << " ############################################### " << "\n";

cout << " \n Creating a Van object *********************** " << "\n";
Van vn1( black, 8, yes );

// Execute each object's version of function ShowInfo

vec1.ShowInfo( );

bs1.ShowInfo( );

vn1.ShowInfo( );


return 0;
}




// The result of compiling the program:

/*
inherit14.cpp(64) : error C2248: 'color' : cannot access private member declared in class 'Vehicle'
inherit14.h(23) : see declaration of 'color'
inherit14.cpp(65) : error C2248: 'numcyl' : cannot access private member declared in class 'Vehicle'
inherit14.h(22) : see declaration of 'numcyl'
inherit14.cpp(76) : error C2248: 'GetColor' : cannot access private member declared in class 'Vehicle'
 inherit14.h(21) : see declaration of 'GetColor'
inherit14.cpp(77) : error C2248: 'GetNumCyl' : cannot access private member declared in class 'Vehicle'
inherit14.h(20) : see declaration of 'GetNumCyl'
inherit14.cpp(101) : error C2248: 'color' : cannot access private member declared in class 'Vehicle'
inherit14.h(23) : see declaration of 'color'
inherit14.cpp(102) : error C2248: 'numcyl' : cannot access private member declared in class 'Vehicle'
inherit14.h(22) : see declaration of 'numcyl'
inherit14.cpp(112) : error C2248: 'GetColor' : cannot access private member declared in class 'Vehicle'
inherit14.h(21) : see declaration of 'GetColor'
inherit14.cpp(113) : error C2248: 'GetNumCyl' : cannot access private member declared in class 'Vehicle'
inherit14.h(20) : see declaration of 'GetNumCyl'
*/