// inherit7.cpp 		By: Aiman Hanna -  ©1993-2002 Aiman Hanna

// This program is just another example of inheritance. No new ideas are there.
// It shows the creation of objects from the base and the inherited classes.

// Key Points:  1) How the creation of objects from an inherited class leads to
// 		   automatic creation of objects from the base class(s). 
//		2) Use of constructor initialization lists.
// 		3) Making sure that the classes have default constructors.

#include "inherit7.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 inforamtion: " << "\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 aclr, int cyl, yes_no bar ) : Vehicle( aclr, cyl )
{
 cout << " Bus...Executing the constructor of the bus class. " << "\n";

 barexist = bar;
}



void Bus::ShowInfo( void )
{
  // Bus had to redefine this function from the base class
  // 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 aclr, int cyl, yes_no tur ) : Bus( aclr, cyl, no )   
								// always no bar
{
 cout << " Van...Executing the constructor of the Van class. " << "\n\n\n";
 turbo = tur;
}




void Van::ShowInfo( void )
{
 // Van had to redefine this function from the base clas
 // 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 Creating a Bus object *********************** " << "\n";
Bus bs1( white, 12, yes );

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 running the program is:

/*
   Creating a Vehicle object ***********************
 Vehicle...Executing the constructor of the Vehicle class.

 Creating a Bus object ***********************
 Vehicle...Executing the constructor of the Vehicle class.
 Bus...Executing the constructor of the bus class.

 Creating a Van object ***********************
 Vehicle...Executing the constructor of the Vehicle class.
 Bus...Executing the constructor of the bus class.
 Van...Executing the constructor of the Van class.


 Vehicle....Here is all the known inforamtion:
 The vehcile color is: red,
 and the number of cylinders is: 4


 Bus...Here is all the needed information:
 The bus color is: white,
 the number of cylinders is: 12,
 and the bus has a bar.


 Van...Here is all the needed information:
 The van color is: black,
 the number of cylinders is: 8,
 and the van is turbo

*/