在类中如何使用cin啊？

[t52693791]

我是新手这个问题应该比较基础，比如现在有这样一个程序

#include<iostream>
#include<string>
using namespace std;
//------------------------------
class student
{public:
void display();
protected:
int num;
string name;
char sex;
};
void student::display()
{
cout<<"num:"<<num<<'\n';
cout<<"name:"<<name<<endl;
cout<<"sex:"<<sex<<endl;
}
//----------------------------------
class student1:protected student
{
public:
void display1();
private:
int age;
string addr;
};
void student1::display1()
{
display();
cout<<"age:"<<age<<'\n';
cout<<"addr:"<<addr<<'\n';
}
//---------------------------
int main()
{
student1 xize;
xize.display1();
return 0;
}
这里面没有赋值，我想问下如果通过cin输入，使用户直接输入这些数据这个代码应该怎么改啊？

[t52693791]

难道没人？在线等。。。。

[arong1234]

重载istream& operator>>(istream & in, student1& stu);
这是最基本的做法,运算符重载一章应该会讲

[Jim_King_2000]

一般来说，继承体系的输入输出应该先定义一个虚函数进行输入输出，然后再重载operator<<，在其中调用该虚函数。代码如下：

// student.h
class student
{
public:
    virtual void input(istream &is);
    virtual void display(ostream &os);

private:
    int num_;
    string name_;
};

class specific_student : public student
{
public:
    virtual void input(istream &is);
    virtual void display(ostream &os);

private:
    int age_;
    string addr_;
};

istream &operator>>(istream &is, student &s);
ostream &operator<<(ostream &os, student &s);

// student.cpp
void student::input(istream &is)
{
    is >> num_;
    is >> name_;
}

void student::display(ostream &os)
{
    os << "number: " << num_ << "\n";
    os << "name: " << name_ << "\n";
}

void specific_student::input(istream &is)
{
    student::input(is);
    is >> age_;
    is >> addr_;
}

void specific_student::display(ostream &os)
{
    student::display(os);
    os << "age: " << age_ << "\n";
    os << "address: " << addr_ << "\n";
}

istream &operator>>(istream &is, student &s)
{
    s.input(is);
    return is;
}

ostream &operator<<(ostream &os, student &s)
{
    s.display(os);
    return os << "\n";
}

[chaoliu1024]

#include<iostream>
#include<string>
using namespace std;
//------------------------------
class student  
{
public:
	void display();
	void get();
protected:
	int num;
	string name;
	char sex;
};
void student::display()
{
	cout<<"num:"<<num<<'\n';
	cout<<"name:"<<name<<endl;
	cout<<"sex:"<<sex<<endl;
}
void student::get()  // mark
{
	cout<<"输入num:";
	cin>>num;
	cout<<"输入name:";
	cin>>name;
	cout<<"输入sex:";
	cin>>sex;
}
//----------------------------------
class student1:protected student
{
public:
	void display1();
	void get1(); // mark
private:
	int age;
	string addr;
};
void student1::display1()
{
	display();
	cout<<"age:"<<age<<'\n';
	cout<<"addr:"<<addr<<'\n';
}
void student1::get1()  // mark
{
	get();  // mark
	cout<<"输入age:";
	cin>>age;
	cout<<"输入addr:";
	cin>>addr;
}
//---------------------------
int main()
{
	student1 xize;
	xize.get1();
	xize.display1();
	return 0;
}