运算符重载，求解答

[weixin_42421082]

class course{
vector<some>sss;
map<string,int>ss;//学号与位置
map<string,int>::iterator ss1;
string name,no,banhao,teacher,where[5];
int number,time[5],n;//课容量
float xuefen,chengji;
public:
......
friend ostream&operator<<(ostream &os,course &d);
friend istream&operator>>(istream &is,course &d);
};
ostream&operator<<(ostream &os,course &d)
{
int i;
cout<<"课程代号\t课程名称\t课程学分\t课堂容量\t教学班号\t任课老师"<<endl;
os<<d.no<<"\t\t"<<d.name<<"\t"<<d.xuefen<<"\t\t"<<d.number<<"\t\t"<<d.banhao<<"\t\t";
if(d.teacher=="-1") cout<<"暂无"<<endl;
else cout<<d.teacher;
cout<<endl;
cout<<"上课时间\t上课地点"<<endl;、
if(d.n==0) cout<<"暂无"<<endl;
for(i=0;i<d.n;i++)
{
cout<<"周";
os<<d.time[i]/10;
cout<<"第";
os<<d.time[i]%10;
cout<<"节";
os<<"\t"<<d.where[i]<<endl;
}
return os;
}
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(66) : error C2248: 'no' : cannot access private member declared in class 'course'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(21) : see declaration of 'no'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(66) : error C2248: 'name' : cannot access private member declared in class 'course'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(21) : see declaration of 'name'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(66) : error C2248: 'xuefen' : cannot access private member declared in class 'course'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(23) : see declaration of 'xuefen'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(66) : error C2248: 'number' : cannot access private member declared in class 'course'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(22) : see declaration of 'number'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(66) : error C2248: 'banhao' : cannot access private member declared in class 'course'
D:\C++\Microsoft Visual Studio\MyProjects\sdfg\sdfg.cpp(21) : see declaration of 'banhao'

[独孤过]

一般类的声明或者定义存在错误，就会导致友元声明未生效 检查有没有其他编译错误

[ellssion]

class 定义变量改成公有类型

[林多]

看这段代码是没有问题的。
应该就像楼上说的，并不是运算符重载写错了。

下面这段代码，是可以编译运行的。（g++）

#include <iostream>
#include <vector>
#include <map>
#include <string>
using namespace std;

class course{
    map<string,int>ss;//学号与位置
    map<string,int>::iterator ss1;
    string name,no,banhao,teacher,where[5];
    int number,time[5],n;//课容量
    float xuefen,chengji;
public:
    friend ostream&operator<<(ostream &os,course &d);
};

ostream& operator<<(ostream &os,course &d)
{
    int i;
    cout<<"课程代号\t课程名称\t课程学分\t课堂容量\t教学班号\t任课老师"<<endl;
    os<<d.no<<"\t\t"<<d.name<<"\t"<<d.xuefen<<"\t\t"<<d.number<<"\t\t"<<d.banhao<<"\t\t";
    if(d.teacher=="-1") cout<<"暂无"<<endl;
    else cout<<d.teacher;
    cout<<endl;
    cout<<"上课时间\t上课地点"<<endl;
    if(d.n==0) cout<<"暂无"<<endl;
    for(i=0;i<d.n;i++)
    {
    cout<<"周";
    os<<d.time[i]/10;
    cout<<"第";
    os<<d.time[i]%10;
    cout<<"节";
    os<<"\t"<<d.where[i]<<endl;
    }
    return os;
}

int main()
{
    course cc;
    std::cout << cc << std::endl;
    return 0;
}