Custom Search
Inheritance example
Simpler methods in the classes have been changed to inline code to shorten the file considerably. In a practical programming situation, methods that are this short should be programmed inline since the actual code to return a simple value is shorter than the code required to send a message to a non-inline method.
/*******************************************************
* MYCPLUS Sample Code - http://www.mycplus.com *
* *
* This code is made available as a service to our *
* visitors and is provided strictly for the *
* purpose of illustration. *
* *
* Please direct all inquiries to saqib at mycplus.com *
*******************************************************/
#include <iostream.h>
class vehicle {
protected:
int wheels;
float weight;
public:
void initialize(int in_wheels, float in_weight);
int get_wheels(void) {return wheels;}
float get_weight(void) {return weight;}
float wheel_loading(void) {return weight/wheels;}
};
class car : public vehicle {
int passenger_load;
public:
void initialize(int in_wheels, float in_weight, int people = 4);
int passengers(void) {return passenger_load;}
};
class truck : public vehicle {
int passenger_load;
float payload;
public:
void init_truck(int how_many = 2, float max_load = 24000.0);
float efficiency(void);
int passengers(void) {return passenger_load;}
};
main()
{
vehicle unicycle;
unicycle.initialize(1, 12.5);
cout << "The unicycle has " << unicycle.get_wheels() << " wheel.\n";
cout << "The unicycle's wheel loading is " << unicycle.wheel_loading() << " pounds on the single tire.\n";
cout << "The unicycle weighs " << unicycle.get_weight() << " pounds.\n\n";
car sedan;
sedan.initialize(4, 3500.0, 5);
cout << "The sedan carries " << sedan.passengers() << " passengers.\n";
cout << "The sedan weighs " << sedan.get_weight() << " pounds.\n";
cout << "The sedan's wheel loading is " << sedan.wheel_loading() << " pounds per tire.\n\n";
truck semi;
semi.initialize(18, 12500.0);
semi.init_truck(1, 33675.0);
cout << "The semi weighs " << semi.get_weight() << " pounds.\n";
cout << "The semi's efficiency is " << 100.0 * semi.efficiency() << " percent.\n";
}
// initialize to any data desired
void
vehicle::initialize(int in_wheels, float in_weight)
{
wheels = in_wheels;
weight = in_weight;
}
void car::initialize(int in_wheels, float in_weight, int people)
{
passenger_load = people;
wheels = in_wheels;
weight = in_weight;
}
void truck::init_truck(int how_many, float max_load)
{
passenger_load = how_many;
payload = max_load;
}
float truck::efficiency(void)
{
return payload / (payload + weight);
}
// Result of execution
// The unicycle has 1 wheel.
// The unicycle's wheel loading is 12.5 pounds on the single tire.
// The unicycle weighs 12.5 pounds.
//
// The sedan carries 5 passengers.
// The sedan weighs 3500 pounds.
// The sedan's wheel loading is 875 pounds per tire.
//
// The semi weighs 12500 pounds.
// The semi's efficiency is 72.929072 percent.
Tags: C++ Programming, Inheritance, Source Code
There are No Comments to this post. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response or TrackBack from your own site.
