The C++ class inheritance:  A simple C++ project development process


Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Displaying some data to demonstrate the creating simple C++ object oriented project development process

To show: How to implement the C++ object oriented class inheritance in C++ programming properly




Create a new Win32 console mode application project named vehicleobject. Add the following header file to your project, named vehicle.h. No need to be compiled.


// the class declaration part, vehicle.h, header file

// add vehicle.h header file to your project, paste the code and save it, do not compile or run


// preprocessor directive to avoid the

// similar header file re-inclusion

#ifndef VEHICLE_H

#define VEHICLE_H


// class declaration

class Cvehicle


// a protected class member can only be accessed or inherited by Cvehicle child or derived class


int wheels;

float weight;


void initialize(int input_wheels,float input_weight);

int get_wheels(void);

float get_weight(void);

float wheel_load (void);




Next add another source file for the class implementation part named vehicle.cpp. Compile it.



// program vehicle.cpp, implementation part, compile without error, generating object file, do not run

#include "vehicle.h"


// class implementation

// initialize to the initial data

void Cvehicle::initialize(int input_wheels, float input_weight)


wheels = input_wheels;

weight = input_weight;



// get the number of wheels of this vehicle

int Cvehicle::get_wheels()


return wheels;



// return the weight of this vehicle

float Cvehicle::get_weight()


return weight;



// return the load on each wheel

float Cvehicle::wheel_load()


return (weight/wheels);




Finally add and run the main() program, myvehicle.cpp



#include <iostream>

using namespace std;

// user define header file and put it in the same folder or project

#include "vehicle.h"


void main(void)


// 4 objects instantiated of type Cvehicle class

Cvehicle car, motorcycle, truck, sedan_car;


// data initialization






// display the data

cout<<"The car has "<<car.get_wheels()<< " tyres."<<endl;

cout<<"Truck has load "<<truck.wheel_load()<<" kg per tyre."<<endl;

cout<<"Motorcycle weight is "<<motorcycle.get_weight()<<" kg."<<endl;

cout<<"Weight of sedan car is "<<sedan_car.get_weight()<<" kg, and has "<<sedan_car.get_wheels()<<" tyres."<<endl;





Output example:


The car has 4 tyres.

Truck has load 1500 kg per tyre.

Motorcycle weight is 900 kg.

Weight of sedan car is 3000 kg, and has 4 tyres.

Press any key to continue . . .



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