#include<iostream.h>
#include<string.h>

class student
{public:
void get_value()
{cin>>num>>name>>sex;}
void display()
{cout<<"num:"<<num<<endl;
cout<<"name:"<<name<<endl;
cout<<"sex:"<<sex<<endl;
private:
    int num;
    string name;
    char sex;
};
class student1:public student
{public:
void display_1()
{
cout<<"age:"<<age<<endl;
cout<<"address:"<<address<<endl;
private:
    int age;
    string address;
};
int main()
{student std1;
std1.get_value();
std1.display();
student1 std2(18,"henan")；
std2.display_1();
return 0;
}
哪位兄弟帮忙看下，出了什么问题？谢谢了！

调试时显示
--------------------Configuration: gongyoujicheng - Win32 Debug--------------------
Compiling...
gongyoujicheng.cpp
c:\documents and settings\administrator\桌面\ggg\gongyoujicheng.cpp(19) : error C2504: 'student' : base class undefined
c:\documents and settings\administrator\桌面\ggg\gongyoujicheng.cpp(32) : error C2018: unknown character '0xa3'
c:\documents and settings\administrator\桌面\ggg\gongyoujicheng.cpp(32) : error C2018: unknown character '0xbb'
c:\documents and settings\administrator\桌面\ggg\gongyoujicheng.cpp(36) : fatal error C1004: unexpected end of file found
Error executing cl.exe.
 
gongyoujicheng.obj - 4 error(s), 0 warning(s)

谢谢兄弟指教！