#include <iostream>
class student
{
public:
student(){}
student(const std::string &name,char &c,unsigned &age):stdname(name),sex(c),stdage(age){}
friend std::ostream &operator<<(std::ostream &,const student &);
~student(){}
private:
std::string stdname;
char sex;
unsigned stdage;
};
std::ostream &operator>>(std::istream &os,const student &std)
{
os<<std.stdname<<' '<<std.sex<<' '<<std.stdage;
return os;
}
int main()
{
student st("zhangjiao",'m',21);
std::cout<<st<<std::endl;
return 0;
}

那怎么办？
换IDE？

谢谢楼各位了啊！

怎么我该掉了还是不行?

真是太感谢你啦！
那这种方式里面要用字符串岂不是非要要C风格的？

用iostream不能用friend访问private成员，要访问就要iostream.h;用string，加上std::，又说不能访问私有的，如下：
#include <iostream.h>
#include <string>
class student
{
public:
student(){}
student(const std::string &name,char c,unsigned int age):stdname(name),sex(c),stdage(age) {}
friend ostream &operator<<(ostream &,const student &);
~student(){}
private:
std::string stdname;
char sex;
unsigned int stdage;//还有这里
};
ostream &operator<<(ostream &os,const student &std)//最严重，你重载的是<<怎么变成>>，是ostream
//不是istream
{
os<<std.stdname<<' '<<std.sex<<' '<<std.stdage;
return os;
}
int main()
{
student st("zhangjiao",'m',21);
cout<<st<<endl;
return 0;
}
compiling...
4.cpp
D:\VC\MSDev98\MyProjects\4\4.cpp(19) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable
conversion)
Error executing cl.exe.

4.obj - 1 error(s), 0 warning(s)

谢谢啦哈！