问两个问题  小弟新手 问的幼稚请莫见怪
程序如下
#include "stdafx.h"
#include <iostream>
#include "math.h"
using namespace std;
class CRect
{  
    float length;
protected:
    float width;
    float get_length() { return length;}
public:
    float area(){return length * width;}
    CRect(float l,float w)
    { length=l;width=w;}
};
class CParal:public CRect
{
    float angle;
public:
    float area() {return (float)(length * width * sin(angle));}//erro
    CParal(float l,float w,float f):CRect(l,w)
    {
        angle=f;
    }
};
float PI=3.14;
void main()
{
    CParal paral(10,12,PI/6);
    cout<<"The area of paral is: "<<paral.area()<<endl;
}
 错误提示是这样的 error C2248: 'CRect::length' : cannot access private member declared in class 'CRect'
意思是否是length 是基类的的私有成员 不能直接访问  但我已经加了这句 float get_length() { return length;}
了啊   我开头这样写对不对#include "stdafx.h"
#include <iostream>
#include "math.h"
using namespace std;