帮我看一段小代码

[chenShuyuNO1]

#include<iostream>
using namespace std;
class Retangle
{
public :
Rectangle(int NewL,int NewW);
int Area();
private:
int Length,Width;

}
Rectangle::Rectangle(int NewL,int NewW)
{
Length=NewL;
Width=NewW;
}
int Rectangle::Area()
{
return(Length+Width)*2;
}
int main()
{
int Length;int Width;int S;
cout<<"请输入矩形的长:";
cin>>Length;
cout<<"请输入矩形的宽:";
myrectangle.Area();
S=myrectangle.Area();
cout<<"矩形的长面积为:"<<S<<endl;
return S;
}。题目要求是定义并且是实现一个矩形类，有长，宽两个属性，用成员函数计算矩形的面积
谢谢了

[macfan]

#include <iostream> 
using namespace std; 
class Retangle 
{ 
public : 
Rectangle(int NewL,int NewW); 
int Area(); 
private: 
int Length,Width; 

} 
Rectangle::Rectangle(int NewL,int NewW) 
{ 
Length=NewL; 
Width=NewW; 
} 
int Rectangle::Area() 
{ 
return(Length+Width)*2; 
} 
int main() 
{ 
int Length;int Width;int S; 
cout < <"请输入矩形的长:"; 
cin>>Length; 
cout < <"请输入矩形的宽:"; 
myrectangle.Area(); 
S=myrectangle.Area(); 
cout < <"矩形的长面积为:" < <S < <endl; 
return 0; 
}

[qqwx_1986]

#include <iostream> 
using namespace std; 
class Retangle 
{ 
public : 
Rectangle(int NewL,int NewW); 
int Area(); 
private: 
int Length,Width; 

};

Rectangle::Rectangle(int NewL,int NewW) 
{ 
Length=NewL; 
Width=NewW; 
} 
int Rectangle::Area() 
{ 
return(Length+Width)*2; 
} 
int main() 
{ 
int Length;int Width;int S; 
cout < <"请输入矩形的长:"; 
cin>>Length; 
cout < <"请输入矩形的宽:"; 
cin>>Width;
Retangle myrectangle(Length,Width);
S=myrectangle.Area(); 
cout < <"矩形的长面积为:" < <S < <endl; 
return 0; 
}

[zgy1353246]

int main()
{
int lenth,width,s;
Rectangle mytangle(lenth,width);
s=mytangle.Area();
cout<<s<<endl;
}

还有面积公式，好像写错了吧

[xxgamexx]

[Quote=引用 3 楼 zgy1353246 的回复:]
int main()
{
int lenth,width,s;
Rectangle mytangle(lenth,width);
s=mytangle.Area();
cout < <s < <endl;
}

还有面积公式，好像写错了吧
[/Quote]

没错　是那样的呀～

ＬＺ是没对length,width两个私有变量初始化　导致面积为空～～

按照那样写是对的～　顶～

[chenShuyuNO1]

#include<iostream>
using namespace std;
class Rectangle
{
public :
Rectangle(int NewL,int NewW);
int Area();
private:
int Lenth,Width;

}
Rectangle::Rectangle(int NewL,int NewW)
{
Lenth=NewL;
Width=NewW;
}
int Rectangle::Area()
{
return(Lenth+Width)*2;
}
int main()
{
int Lenth;int Width;int S;
cout<<"请输入矩形的长:";
cin>>Lenth;
cout<<"请输入矩形的宽:";
Rectangle myrectangle(0, 0);
S=myrectangle.Area();
cout<<"矩形的面积为:"<<S<<endl;
return S;
}.其中创建对象的时候,Rectangle myrectangle(0, 0);它总是出现这样一句D:\MyProjects\EX2\4-11.cpp(27) : error C2264: 'Rectangle::Rectangle' : error in function definition or declaration; function not called

[weekly123]

int Rectangle::Area()
{
return(Length+Width)*2;
}
面积是不是
int Rectangle::Area()
{
return Length*Width;
}
难道我小学数学学的不对？

[weekly123]

cout < <"请输入矩形的宽:";
后面是不是少了
cin>>Width;

？