#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)

你写的代码格式要改正改正，里面问题看起来也方便点，还算好简单。
#include<iostream>
#include<string>
using namespace std;
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:
    student1(int age1,string address1):age(age1),address(address1){}
    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;
}

谢谢兄弟指教！