一个重载的问题？急求大大

[xugao287]

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
struct student
{
string num;
string name;
string score;
};
class stud
{
private:
student s;
public:
stud()
{
cin>>s.num>>s.name>>s.score;
}
fstream& operator<<(fstream& in,class& out)
{
in<<out.s.num<<out.s.name<<out.s.score;
return in;
}
}
void main()
{
stud s;
fstream out("pig.txt",ios::in|ios::out);
out<<s;
}

[独孤过儿]

没有人告诉过你，输入和输出操作符只能重载成友元的吗？

[xugao287]

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
struct student
{
string num;
string name;
string score;
};
class stud
{
public:
student s;
stud()
{
cin>>s.num>>s.name>>s.score;
}
friend fstream& operator<<(const fstream& in,const stud& out);
};
fstream& operator<<(const fstream& in,const stud& out)
{
in<<out.s.num<<out.s.name<<out.s.score;
return in;
}
void main()
{
stud s;
fstream out("pig.txt",ios::in|ios::out);
out<<s;
}
这样还是不行呀？能不能给个具体解决了的代码？ 谢谢

[taodm]

用的VC6这个垃圾货吧。建议扔了，升级到VC2005express或者wxdevcpp
实在不肯，那么
class stud
{
public:
student s;
stud()
{
cin>>s.num>>s.name>>s.score;
}
friend fstream& operator < <(const fstream& in,const stud& out)
{
in < <out.s.num < <out.s.name < <out.s.score;
return in;
}
};
还有，你这个in和out真是起得好变量名。