不知道这个标题是否对～～
下面是个求矩形周长及面积的程序
原来是这样的：
#include<iostream.h>
class Rectangle
{
public:
void SetRectangle (double top,double left,double bottom,double right);
double GetTop(){return itsTop;}
double GetLeft(){return itsLeft;}
double GetBottom(){return itsBottom;}
double GetRight(){return itsRight;}
double Perimeter();
double Area();
private:
double itsTop,itsLeft,itsBottom,itsRight;
};

void Rectangle::SetRectangle (double top,double left,double bottom,double right)
{
itsTop=top;
itsLeft=left;
itsBottom=bottom;
itsRight=right;
}
double Rectangle::Perimeter()
{
double Width,Height;
Width=itsRight-itsLeft;
Height=itsTop-itsBottom;
return(2*(Width+Height));
}
double Rectangle::Area()
{
double Width,Height;
Width=itsRight-itsLeft;
Height=itsTop-itsBottom;
return (Width*Height);
}
int main()
{
Rectangle Rect;
Rect.SetRectangle(6.3,2.1,3.2,5.2);
cout<<"左下角与右上角坐标分别为("<<Rect.GetLeft()<<","<<Rect.GetBottom()<<")、("<<Rect.GetRight()<<","<<Rect.GetTop()<<")的矩形";
cout<<endl;
cout<<"周长："<<Rect.Perimeter()<<endl;
cout<<"面积:"<<Rect.Area()<<endl;
return 0;
}
但我想改成自己输入参数的，于是就： （但编译没通过，正确的应该是怎样的？）
#include<iostream.h>
class Rectangle
{
public:
void SetRectangle (double top,double left,double bottom,double right);
double GetTop(){return itsTop;}
double GetLeft(){return itsLeft;}
double GetBottom(){return itsBottom;}
double GetRight(){return itsRight;}
double Perimeter();
double Area();
private:
double itsTop,itsLeft,itsBottom,itsRight;
};

void Rectangle::SetRectangle (double top,double left,double bottom,double right)
{
cout<<"请按顺序输入左下标和右上标"<<endl;
cin>>top>>left>>bottom>>right;
itsTop=top;
itsLeft=left;
itsBottom=bottom;
itsRight=right;
}
double Rectangle::Perimeter()
{
double Width,Height;
Width=itsRight-itsLeft;
Height=itsTop-itsBottom;
return(2*(Width+Height));
}
double Rectangle::Area()
{
double Width,Height;
Width=itsRight-itsLeft;
Height=itsTop-itsBottom;
return (Width*Height);
}
int main()
{
Rectangle Rect;
Rect.SetRectangle(top,left,bottom,right);
cout<<"左下角与右上角坐标分别为("<<Rect.GetLeft()<<","<<Rect.GetBottom()<<")、("<<Rect.GetRight()<<","<<Rect.GetTop()<<")的矩形";
cout<<endl;
cout<<"周长："<<Rect.Perimeter()<<endl;
cout<<"面积:"<<Rect.Area()<<endl;
return 0;
}

[此贴子已经被作者于2007-5-12 14:25:44编辑过]

建议用运算符重载．
能得到如下的效果：S = (width+height)*2;

不明白
不过还是谢谢你啦


是不是我的程序太长了

SetRectangle()
写成这样，不要参数．
void Rectangle::SetRectangle ()
{
int top, left, bottom, right;
cout<<"请按顺序输入左下标和右上标"<<endl;
cin>>top>>left>>bottom>>right;
itsTop=top;
itsLeft=left;
itsBottom=bottom;
itsRight=right;
}

像你这样改的话还是有错喔～·

c:\documents and settings\administrator.31e049c0ddeb450\桌面\cpp1.cpp(17) : error C2511: 'SetRectangle' : overloaded member function 'void (void)' not found in 'Rectangle'
c:\documents and settings\administrator.31e049c0ddeb450\桌面\cpp1.cpp(3) : see declaration of 'Rectangle'
c:\documents and settings\administrator.31e049c0ddeb450\桌面\cpp1.cpp(42) : error C2065: 'top' : undeclared identifier
c:\documents and settings\administrator.31e049c0ddeb450\桌面\cpp1.cpp(42) : error C2065: 'left' : undeclared identifier
c:\documents and settings\administrator.31e049c0ddeb450\桌面\cpp1.cpp(42) : error C2065: 'bottom' : undeclared identifier
c:\documents and settings\administrator.31e049c0ddeb450\桌面\cpp1.cpp(42) : error C2065: 'right' : undeclared identifier
执行 cl.exe 时出错.

后来我改成这样，就通过了
int main()
{
double l,b,r,t;
Rectangle Rect;
Rect.SetRectangle(6.3,2.1,3.2,5.2);
cout<<"左下角与右上角坐标分别为("<<Rect.GetLeft()<<","<<Rect.GetBottom()<<")、("<<Rect.GetRight()<<","<<Rect.GetTop()<<")的矩形";
cout<<endl;
cout<<"周长："<<Rect.Perimeter()<<endl;
cout<<"面积:"<<Rect.Area()<<endl;
cout<<"请按顺序输入左下角与右上角的坐标"<<endl;
cin>>l>>b>>r>>t;
Rect.SetRectangle(l,b,r,t);
cout<<"左下角与右上角坐标分别为("<<Rect.GetLeft()<<","<<Rect.GetBottom()<<")、("<<Rect.GetRight()<<","<<Rect.GetTop()<<")的矩形";
cout<<endl;
cout<<"周长："<<Rect.Perimeter()<<endl;
cout<<"面积:"<<Rect.Area()<<endl;
return 0;
}

对于函数我还不是很了解，多多指教哈～。。