C++高手请金!!

#include<iostream.h>
class area_cl{
protected:
double height,width;
public:
area_cl(double r,double s)
{height=r;
width=s;}
};
{
class box:public area_cl
{public:
box(double r,double s):area_cl(r,s){}
void area()
{cout<<"矩形面积"<< height*width<<endl;}
};
class isosceles:public area_cl{
public:
isosceles(double r,double s):area_cl( r, s){}
void area()
{
cout<<"三角形面积"<< height*width/2<<endl;}
};

void main()
{

float a,b,c,d;
cout<<"输入矩形长"<<endl;
cin>>a;
cout<<"输入矩形宽"<<endl;
cin>>b;
box A(a,b);
cout<<"输入三角形高"<<endl;
cin>>c;
cout<<"输入三角形宽"<<endl;
cin>>d;
isosc

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