在继承时重载>>和<<时出现问题？

[elegant87]

我写了一个继承的类，在不同的类中对>>和<<共进行了三次重载，
运算符重载实质就是函数重载，可以识别的，但并没有达到我的目的。
大家帮忙看看吧！

#include<iostream>
#include<string>
#include<fstream>

using namespace std;

class Birthday 
{
public:
        Birthday();
        Birthday(const Birthday& b);
        friend istream& operator >>(istream& in,Birthday& b);
        friend ostream& operator <<(ostream& out,Birthday& b);
private:
        size_t year;
        size_t month;
        size_t day;
};

class People
{
public:  
         People();
         People(const People& p);
         friend istream& operator >>(istream& in,People& p);
         friend ostream& operator <<(ostream& out,People& p);
protected:
        string name;
        Birthday bir;
};
class Student: public People
{
public:
       Student();
       Student(const Student& s);
       friend istream& operator >>(istream& in,Student& s);
       friend ostream& operator <<(ostream& out,Student& s);
private:
        size_t score;
};
Birthday::Birthday(){}

Birthday::Birthday(const Birthday& b):year(b.year),month(b.month),day(b.day){}

istream& operator >>(istream& in,Birthday& b)
{
      cout<<"Enter the birthday(year/month/day): ";
      in>>b.year>>b.month>>b.day;
      return in;
}

ostream& operator <<(ostream& out,Birthday& b)
{
      out<<b.year<<"/"<<b.month<<"/"<<b.day<<endl;
      return out;
}

People::People(){}

People::People(const People& p):name(p.name),bir(p.bir){}

istream& operator >>(istream& in,People& p)
{
     cout<<"Enter the name: ";
     in>>p.name;
     in>>p.bir;
     return in;
}
ostream& operator <<(ostream& out,People& p)
{
     out<<"The name is: "<<p.name<<endl;
     out<<"The birthday is: "<<p.bir;
     return out;
}

Student::Student(){}

Student::Student(const Student& s):People(s),score(s.score){}

istream& operator >>(istream& in,Student& s)
{
         cout<<"Enter the name: ";
         in>>s.name;
         in>>s.bir;
         cout<<"Enter the score: ";
         in>>s.score;
         return in;
}
         
ostream& operator <<(ostream& out,Student& s)
{
         out<<"The name is: "<<s.name<<endl;
         out<<"The birthday is: "<<s.bir;
         out<<"The score is: "<<s.score<<endl;
         return out;
}

void Save(People &p,Student& s)
{
     ofstream outfile;
     outfile.open("people.txt",ios::out);
     if(!outfile.is_open())
     {
           cerr<<"Can not open the file!"<<endl;
           exit(0);
     }
     outfile<<p<<endl<<"Stuent message is:"<<endl<<s;
     cout<<"Save end!"<<endl;
}

int main()
{
    People p;
    cin>>p;
    cout<<p;
    Student s;
    cin>>s;
    cout>>s;
    Save(p,s);
    system("pause");
    return 0;
}                  

错误提示：
Compiling...
145.cpp
145.cpp: In function `int main()':
145.cpp:118: error: no match for 'operator>>' in 'std::cout >> s'
145.cpp:46: error: candidates are: std::istream& operator>>(std::istream&,
Birthday&)
145.cpp:63: error: std::istream& operator>>(std::istream&,
People&)
145.cpp:81: error: std::istream& operator>>(std::istream&,
Student&)

145.o - 4 error(s), 0 warning(s)

[ttkk_2007]

cout>>s;
很明显，写错了，cout << s;

[wangdeqie]

//改成这样
#include<iostream>
#include<string>
#include<fstream>

using namespace std;

class Birthday 
{
public:
	Birthday();
	Birthday(const Birthday& b);
	friend istream& operator >>(istream& in,Birthday& b)
	{
		cout<<"Enter the birthday(year/month/day): ";
		in>>b.year>>b.month>>b.day;
		return in;
	}
	friend ostream& operator <<(ostream& out,Birthday& b)
	{
		out<<b.year<<"/"<<b.month<<"/"<<b.day<<endl;
		return out;
		
	}
private:
	size_t year;
	size_t month;
	size_t day;
};

class People
{
public:  
	People();
	People(const People& p);
	friend istream& operator >>(istream& in,People& p)
	{
		cout<<"Enter the name: ";
		in>>p.name;
		in>>p.bir;
		return in;
	}
	friend ostream& operator <<(ostream& out,People& p)
	{
		out<<"The name is: "<<p.name<<endl;
		out<<"The birthday is: "<<p.bir;
		return out;
	}
protected:
	string name;
	Birthday bir;
};
class Student: public People
{
public:
	Student();
	Student(const Student& s);
	friend istream& operator >>(istream& in,Student& s)
	{
		cout<<"Enter the name: ";
		in>>s.name;
		in>>s.bir;
		cout<<"Enter the score: ";
		in>>s.score;
		return in;
	}
	friend ostream& operator <<(ostream& out,Student& s)
	{
		out<<"The name is: "<<s.name<<endl;
		out<<"The birthday is: "<<s.bir;
		out<<"The score is: "<<s.score<<endl;
		return out;
	}
private:
	size_t score;
};
Birthday::Birthday(){}

Birthday::Birthday(const Birthday& b):year(b.year),month(b.month),day(b.day){}


People::People(){}

People::People(const People& p):name(p.name),bir(p.bir){}


Student::Student(){}

Student::Student(const Student& s):People(s),score(s.score){}

void Save(People &p,Student& s)
{
	ofstream outfile;
	outfile.open("people.txt",ios::out);
	if(!outfile.is_open())
	{
		cerr<<"Can not open the file!"<<endl;
		exit(0);
	}
	outfile<<p<<endl<<"Stuent message is:"<<endl<<s;
	cout<<"Save end!"<<endl;
}

int main()
{
    People p;
    cin>>p;
    cout<<p;
    Student s;
    cin>>s;
    cout<<s;
    Save(p,s);
    system("pause");
    return 0;
}                  

[xkyx_cn]

呵呵，编程要细心：

cout << s;

[jay的Fans]

Student s;
cin>>s;
cout>>s;//好奇怪...
Save(p,s);

[elegant87]

呵呵，谢谢大家的提醒。我真是太粗心了！

[elegant87]

大家评价一下这个程序怎么样？

[Rocky_]

学会根据编译器提示自己修改错误
编译器有提出多少行的
一般编译错误是语法错误
很容易修改

[xkyx_cn]

很好，继续努力

[Quote=引用 6 楼 elegant87 的回复:]
大家评价一下这个程序怎么样？
[/Quote]

[elegant87]

小弟新手，正在看C++Primer，有什么好的意见提提！谢谢大家，我会努力的！

[wangdeqie]

[Quote=引用 9 楼 elegant87 的回复:]
小弟新手，正在看C++Primer，有什么好的意见提提！谢谢大家，我会努力的！
[/Quote]
俺也是新手菜鸟，共同进步，互相勉励下^_^

[wangdeqie]

楼主比我本科那会儿强多了，现在读研，编程能力稍微有点提高！