问个程序

C/C++ code

 
 #include <iostream> 
 using namespace std; 
  
 class Animal 
 { 
 public: 
 Animal(){} 
 void eat(){cout  < < "eat\n";} 
 }; 
  
 class Giraffe:private Animal 
 { 
 public: 
 Giraffe(){} 
 void StrechNeck(double){cout  < < "strech neck\n";} 
 }; 
  
 class Cat:public Animal 
 { 
 Cat(){} 
 void Meaw(){cout  < < "meaw\n";} 
 }; 
 void Func(Animal &an) 
 { 
 an.eat(); 
 } 
  
 void main() 
 { 
 Cat dao; 
 //Giraffe gir; 
 Func(dao); 
 } 
 

为什么会报错呢?书上说可以的...

[解决办法]
Your constructor of Cat class should be public ...
[解决办法]
class Cat:public Animal
{
// 少了个public 默认是private的，下面定义Cat dao;时需要调用构造函数
public:
Cat(){}
void Meaw(){cout << "meaw\n";}
};
[解决办法]

引用楼主 yxlovemoney 的帖子:

C/C++ code
#include<iostream>
using namespace std;

class Cat:public Animal
{
Cat(){}
void Meaw(){cout << "meaw\n";}
};
...