给学生看看

[天地一棵树]

#include<iostream.h>
#include<fstream.h>


class student
{
public:
char name[10];
int num;
float mathScore,englishScore;
friend ostream &operator<<(ostream &out,student &s);
friend istream &operator>>(istream &in,student &s);

};


ostream &operator<<(ostream &out,student &s)
{
out<<s.name<<" "<<s.num<<" "<<s.mathScore<<" "<<s.englishScore<<'\n';
return out;
}


istream &operator<<(istream &in,student &s)
{
in>>s.name>>s.num>>s.mathScore>>s.englishScore;
return in;
}


void main()
{
ofstream ofile;
ifstream ifile;
ofile.open("d:\\s.txt");

student s;
for(int i=1;i<=3;i++)
{
cout<<"请输入第i个学生的姓名 学号 数学成绩 英语成绩 "<<endl;
cin>>s;
cout<<s;
// cin>>s.name>>s.num>>s.mathScore>>s.englishScore>>endl;
// cout<<s.name<<s.num<<s.mathScore<<s.englishScore<<endl;
}
ofile.close();
cout<<"\n读出文件内容"<<endl;
// ifile.open("C:\\Documents and Settings\\use\\桌面\\学生信息\\myfile.txt");
ifile.open("d:\\s.txt");
ifile>>s;
//ifile>>s;
while(!ifile.eof())
{
cout<<s.name<<s.num<<s.mathScore<<s.englishScore<<endl;
ifile>>s;
}
ifile.close();


}

[JackLam]

万能的老师，我来拿分了

[djh512]

？

[butwang]

?

[天地一棵树]

编译时出现这个错误
E:\shixi3\shixi3.cpp(40) : error C2679: binary '>>' : no operator defined which takes a right-hand operand of type 'class ostream &(__cdecl *)(class ostream &)' (or there is no acceptable conversion)
给解释一下吧

[avalon]

晕死。我C++学得还不够啊。才看到常对象。搞得这个程序都看不懂！我要加油！

[flei_gu]

似曾相识，检察下类型匹配。指针什么的。我是在数据流里遇到过。

[sandaobaqi]

代码一多我就晕，又不行了

[jzd8000]

你看着你的声明和实现不别扭？

friend istream &operator>>(istream &in,student &s);

istream &operator < <(istream &in,student &s)
{
in>>s.name>>s.num>>s.mathScore>>s.englishScore;
return in;
}

[zgjxwl]

e

[renjianxin520]

LZ的问题，貌似我了解

[renjianxin520]

没有细看你的程序，但是可能问题在类型匹配上

[clhposs]

#ifndef PEOPLE_CLASS
#define PEOPLE_CLASS
/*
*人员类
*操作单个人
*只提够默认构造函数,重载了输入输出
*/
class People
{
public:
	//重载输入操作
	friend std::istream& operator>>(std::istream &in, People &people);
	//重载输出操作
	friend std::ostream& operator<<(std::ostream &os, People &people);
	People();
	People(const People &people);
	People& operator=(const People &people);
	//查找是否存在某个关键字,查询失败返回NULL
	People* find(std::string strFind);
private:
	std::string strNumber;	//学号
	std::string strName;	//姓名
	std::string strClass;	//班级
	std::string strCollege;	//学院
	std::string strPho;		//电话
	std::string strQQ;		//QQ号码	
};
#endif
#include <iostream>
#include <string>
#include "People.h"

People::People():strNumber(""), strName(""), strClass(""), strCollege(""), strPho(""), strQQ("")
{}

People::People(const People &people):strNumber(people.strNumber), strName(people.strName), strClass(people.strClass),strCollege(people.strCollege), strPho(people.strPho), strQQ(people.strQQ)
{}

People& People::operator =(const People &people)
{
	strNumber = people.strNumber;
	strName = people.strName;
	strClass = people.strClass;
	strCollege = people.strCollege;
	strPho = people.strPho;
	strQQ = people.strQQ;

	return *this;
}

std::istream& operator>>(std::istream& in, People &people)
{
	std::cout << "学号:";
	in >> people.strNumber;
	std::cout << "姓名:";
	in >> people.strName;
	std::cout << "班级:";
	in >> people.strClass;
	std::cout << "学院:";
	in >> people.strCollege;
	std::cout << "电话:";
	in >> people.strPho;
	std::cout << "Q Q :";
	in >> people.strQQ;

	return in;
}

std::ostream& operator<<(std::ostream& os, People &people)
{
	os << "学号:" << people.strNumber << "\t姓名:" << people.strName 
		<< "\t班级:" << people.strClass << "\t学院:" << people.strCollege
		<< "\t电话:" << people.strPho << "\tQQ:" << people.strQQ;
	
	return os;
}

People* People::find(const std::string strFind)
{
	if (strNumber == strFind || strName == strFind ||
		strClass == strFind || strCollege == strFind || strPho == strFind || strQQ == strFind)
		return this;
	else
		return NULL;
}

#ifndef MANAGEPEOPLE_CLASS
#define MANAGEPEOPLE_CLASS
#include "People.h"

/*
*	管理People,对多个People的封装
*	对管理系统的封装
*/
class ManagePeople
{
public:
	friend std::istream& operator>>(std::istream &is, ManagePeople &people);
	friend std::ostream& operator<<(std::ostream &os, const ManagePeople &people);
	ManagePeople();
	ManagePeople(const ManagePeople& people);
	ManagePeople& operator=(const ManagePeople &people);
	
	void show();
private:
	//显示菜单
	void showMenu();
	//显示所有学生信息
	void showStudent();
	//增加学生信息
	void addStudent();
	//删除学生信息
	void delStudent();
	//查找学生信息,成功查找返回指向改学生信息的迭代器
	std::vector<People>::iterator find();
	//销毁容器
	void destroyManage();
private:
	std::vector<People> all_people;	//存储所有人信息
	int index;						//存储你输入的选项
};
#endif

#include <iostream>
#include <vector>
#include <string>
#include <windows.h>
#include "ManagePeople.h"
#include "People.h"

ManagePeople::ManagePeople():all_people()
{}

ManagePeople::ManagePeople(const ManagePeople &people):all_people(people.all_people)
{}

ManagePeople& ManagePeople::operator=(const ManagePeople &people)
{
	this->all_people = people.all_people;
	return *this;
}

void ManagePeople::showMenu()
{
	system("cls");
	std::cout << "\t\t\t\t学生管理系统\n" << std::endl;
	std::cout << "\t\t\t     1.显示所有学生信息" << std::endl;
	std::cout << "\t\t\t     2.添加学生信息" << std::endl;
	std::cout << "\t\t\t     3.删除学生信息" << std::endl;
	std::cout << "\t\t\t     4.初始化系统(慎用)" << std::endl;
	std::cout << "\t\t\t     5.退出系统" << std::endl;
	std::cout << "\n\t\t\t请选择(1,2,3,4,5):";
	std::cin >> index;
}

std::vector<People>::iterator ManagePeople::find()
{
	system("cls");
	std::string strFind;
	std::cout << "请输入查找关键字:" << std::endl;
	std::cin >> strFind;

	for (std::vector<People>::iterator iter = all_people.begin(); iter != all_people.end(); ++iter)
	{
		if (iter->find(strFind))
			return iter;
	}
	return all_people.end();
}
void ManagePeople::delStudent()
{
	std::vector<People>::iterator iter = find();
	if (iter == all_people.end())
	{
		std::cout << "没有找到相关信息" << std::endl;
	}
	else
	{
		all_people.erase(iter);
	}
}

void ManagePeople::showStudent()
{
	system("cls");
	for (std::vector<People>::iterator iter = all_people.begin(); iter != all_people.end(); ++iter)
	{
		std::cout << *iter << std::endl;
	}
}

void ManagePeople::addStudent()
{
	People people;
	std::cin >> people;
	all_people.push_back(people);
}

void ManagePeople::destroyManage()
{
	system("cls");
	std::string str;
	std::cout << "确认初始化系统?(Y/N)" << std::endl;
	std::cin >> str;
	if (str == "n" || str == "N")
		return;
	std::cout << "\n强制关闭系统可结束系统初始化\n" << std::endl;
	while (index++ != 83)
	{
		Sleep(90);
		std::cout << "<";
	}
	all_people.erase(all_people.begin(), all_people.end());
	std::cout << "\t\t\t\t系统初始化成功" << std::endl;
	system("pause");
}
void ManagePeople::show()
{
	while (true)
	{
		showMenu();

		switch(index)
		{
		case 1:
			showStudent();
			system("pause");
			break;
		case 2:
			addStudent();
			break;
		case 3:
			delStudent();
			break;
		case 4:
			destroyManage();
			break;
		case 5:
			exit(0);
		}
	}
}

[jinghaijingtian]

[Quote=引用 12 楼 clhposs 的回复:]
C/C++ code#ifndef PEOPLE_CLASS#define PEOPLE_CLASS/*
*人员类
*操作单个人
*只提够默认构造函数,重载了输入输出*/class People
{public://重载输入操作 friend std::istream&operator>>(std::istream&in, People&people);//重载输出操作 friend ?-
[/Quote]
这是什么啊

[clhposs]

我用C＋＋些的学生管理系统 我以为楼主要

这个是我写的那个系统的2个类

[kxalpah]

重载的时候写反了吧

[forster]

啥老师