Question

C++编程问题【使用Rectangle类创建一个派生类Square】

【问题描述】声明一个基类Shape，在此基础上派生出Rectangle和Circle,两者都有GetArea（）函数计算对象的面积。使用Rectangle类创建一个派生类Square。Circle半径是5，Rectangle长宽分别为4,6,Square半径为5
【输入形式】
【输出形式】
The area of the Circle is 78.5
The area of the Rectangle is 24
The area of Square is 25

Answer 1

//
#ifndef q_C
#define q_C
#include "stdafx.h"
#include "shape.h"

class circle : public shape
{
private:
int R;
public:
circle();
~circle();
void Set();
void GetArea();
};

#endif

#ifndef q_R
#define q_R
#include "stdafx.h"
#include "shape.h"
#include <iostream>
using namespace std;

class rectangle : public shape
{
private:
int width;
int length;
public:
rectangle();
~rectangle();
void Set();
void GetArea();
};

#endif

#ifndef q_Q
#define q_Q
#include "stdafx.h"
#include "rectangle.h"
#include <iostream>
using namespace std;
class square : public rectangle
{
private:
int r;
public:
square();
~square();
void Set();
void GetArea();
};

#endif

#ifndef q_S
#define q_S
#include "stdafx.h"
#include <iostream>
using namespace std;
class shape
{
private:
int i;

public:
shape();
~shape();
void get();
};

#endif

cpp:
#include "stdafx.h"
#include "circle.h"
#include <iostream>
using namespace std;

circle::circle()
{
R = 5;
}

circle::~circle()
{

}

void circle::GetArea()
{
float area = 3.14*R*R;
cout << "the area of circle is " << area << endl;
}

#include "stdafx.h"
#include "rectangle.h"

rectangle::rectangle()
{
width = 6;
length = 4;
}

rectangle::~rectangle()
{

}

void rectangle::GetArea()
{
int area = width*length;
cout << "the area of square is " << area << endl;
}

#include "stdafx.h"
#include "square.h"

square::square()
{
r = 5;
}

square::~square()
{

}

void square::GetArea()
{
int area = r*r;
cout << "the area of square is " << area << endl;
}

#include "stdafx.h"
#include "shape.h"

shape::shape()
{
i = 0;
}

shape::~shape()
{

}

void shape::get()
{
cout << "you are right" << endl;
}

// test.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "circle.h"
#include "rectangle.h"
#include "shape.h"
#include "square.h"

int main(void)
{
circle C;
C.GetArea();

rectangle r;
r.GetArea();

square q;
q.GetArea();

system("pause");

return 0;
}

分别建立头文件与源文件运行即可

Answer 2

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