连接错误。。--------------------Configuration: 派生 - Win32 Debug--------------------
程序代码：形状（一）
编写C++程序完成以下功能：
声明一个基类Shape（形状），其中包含一个方法来计算面积；
从Shape派生两个类矩形和圆形；
从矩形派生正方形；
分别实现派生类构造函数、析构函数和其他方法；
创建派生类的对象，观察构造函数、析构函数调用次序；
不同对象计算面积。
#include<iostream>
using namespace std;
const double Pi=3.14;
class shape
{
public:
shape(){cout<<"shape constructor called"<<endl;}
double Getarea(double x,double y){return area=x*y;}
~shape(){cout<<"shape destructor called"<<endl;}
private:
double area;
};
class rectangle:public shape
{
public:
rectangle();
double rect(double X,double Y){return Getarea(X,Y);cout<<"rectangle constructor called"<<endl;}
~rectangle(){cout<<"rectangle destructor called"<<endl;}
};
class circle:public shape
{ public:
circle();
double cir_area(double r){cout<<"circle constructor called"<<endl;return Pi*Getarea(r,r);}
~circle(){cout<<"circle destructor called"<<endl;}
};
class square:public rectangle
{
public:
square();
double squa(double X){cout<<"square constructor called"<<endl;return Getarea(X,X);}
~square(){cout<<"aquare destructor called"<<endl;}
};
int main()
{ double l,w,r,x;
cout<<"请输入长方形的长与宽"<<endl;
cin>>l>>w;
rectangle rec();
cout<<"the area of rec is:"<<rec.rect(l,w)<<endl;
cout<<"请输入圆的半径"<<endl;
cin>>r;
circle cir( );
cout<<"the area of cir is:"<<cir.cir_area(r)<<endl;
cout<<"请输入正方形的边长"<<endl;
cin>>x;
square squ( );
cout<<"the area of squ is:"<<squ.squa(x)<<endl;
return 0;
}[ 本帖最后由 fishviv 于 2010-9-11 10:41 编辑 ]
