Example of a C + + class inheritance-graphics

This article is my tutor when the topic, I hope there is no copyright issues. This is a simple example of C + + class inheritance, the inheritance relationship is a graph----triangle---------------------rectangle----square, which also includes such classes as fill graphics, and shows polymorphism.

Note that this program needs to be compiled with a compiler that supports c++11 , such as Vs2013,dev C + +, etc.

1. Main program

Prog.cpp#include "SHAPES.HPP" using namespace Std;int Main () {vector<rectangle*> rectangles;      Rectangles.push_back (New Rectangle (3, 5));      Die beiden Argumente geben Breite und definition an rectangles.push_back (new Rectangle (5, 7)); Die beiden Argumente geben Breite und definition an rectangles.push_back (new Filledrectangle (7, 5));//Die beiden Argument            E geben Breite und definition an rectangles.push_back (new Square (6));      Das Argument gibt die Seitenlänge an Rectangles.push_back (new Filledsquare (7));    Das Argument gibt die seitenlänge A//for (rectangle* r:rectangles) {//R->print ();    } vector<triangle*> Triangles; Bei den dreiecken soll es sich um gleichschenklige, rechtwinklige//Dreiecke handeln.    Der Rechte Winkel wird von von den Gleichlangen Seiten//Eingeschlossen.      Triangles.push_back (New Lefttriangle (10)); Das Argument gibt die Länge der Triangles.push_back (New RightTriangle (7));        Beiden Gleichlangen Seiten an.    for (triangle* t:triangles) {//T->print ();    } vector<shape*> shapes;    Dealt Jedes R in rectangles for (rectangle* r:rectangles) {shapes.push_back (R);    }//Dealt jedes T in triangles for (triangle* t:triangles) {shapes.push_back (t);    }//dealt jedes s in shapes for (Shape *s:shapes) {processshape (*s);    }////////////////////////////for (Shape *s:shapes) {delete S; }}

 2, header file, hpp file, has now been upgraded to HPP, hehe

Shapes.hpp#ifndef shapes_hpp#define shapes_hpp#include <iostream> #include <vector>class shape{public:        virtual void print () const = 0;    virtual void print () const;        Virtual double area () const = 0; Virtual double perimeter () const = 0;};        Class Rectangle:public Shape{protected:int width;    int height;        Public:rectangle (int width, int height);        virtual void print () const;        Virtual double area () const; Virtual double perimeter () const;};        Class Filledrectangle:public Rectangle{public:filledrectangle (int width, int height); virtual void print () const;}; Class Square:public Rectangle{public:square (int length);}; Class Filledsquare:public Filledrectangle{public:filledsquare (int length);};    Class Triangle:public Shape{protected:int length;        Public:triangle (int length);        Virtual double area () const; Virtual double perimeter () const;}; Class Lefttriangle:pUblic triangle{public:lefttriangle (int lenght); virtual void print () const;};        Class Righttriangle:public Triangle{public:righttriangle (int length); virtual void print () const;}; void Processshape (const shape& s); #endif

 3, CPP files

Shapes.cpp#include "SHAPES.HPP" using namespace std;void Shape::p rint () const{//error;}    Rectangle::rectangle (int width, int height) {this->width = width; This->height = height;}        void Rectangle::p rint () const{for (int i = 0, i < height; i++) {for (int j = 0; J < width; j + +) {if (i > 0 && i < height-1 && J > 0 && J < width-1) PR            Intf ("");        else printf ("*");    } printf ("\ n"); }}double Rectangle::area () const{return width * height;} Double Rectangle::p erimeter () const{return 2 * (width + height);} Filledrectangle::filledrectangle (int width, int height): Rectangle (width, height) {}void filledrectangle::p rint () const{for (int i = 0, i < height; i++) {for (int j = 0; J < width; j + +) {printf ("*        ");    } printf ("\ n"); }}square::square (int length): Rectangle (length, length) {}filledsquare::filLedsquare (int length): filledrectangle (length, length) {}triangle::triangle (int length) {this->length = length;} Double Triangle::area () const{return length * LENGTH/2;        Double Triangle::p erimeter () const{return (2 + 1.414) * length; }lefttriangle::lefttriangle (int length): Triangle (length) {}void lefttriangle::p rint () const{for (int i = 0; i < length;                i++) {for (int j = 0; J < length; J + +) {if (j = = 0 | | i = = J | | i = = length-1)            printf ("*");        else printf ("");    } printf ("\ n"); }}righttriangle::righttriangle (int length): Triangle (length) {}void righttriangle::p rint () const{for (int i = 0; i < l Ength; i++) {for (int j = 0; J < length; J + +) {if (j = = Length-1 | | length-i-1 = = J | | i =            = length-1) printf ("*");        else printf ("");    } printf ("\ n"); }}void ProcessshaPE (const shape& s) {s.print ();    cout << "Flaeche:" << s.area () << Endl;    cout << "Umfang:" << s.perimeter () << Endl; cout << Endl << Endl;}

The results are as follows:

Example of a C + + class inheritance-graphics