派生类_1

#include<iostream>
#include<string.h>
using namespace std;
class Student{
private :
int number;
char name[20];
public :
Student()
{
number=0;
name[0]='\0';
}
void SetValue(int n,char *s1)
{
number=n;
strcpy(name,s1);
}
void print()
{
cout<<"Number:"<<number<<endl;
cout<<"Name:"<<name<<endl;
}
};
class UGStudent:public Student
{
private :
int age;
int grade;
public :
UGStudent()
{
SetValue(0,"");
age=0;
grade=0;
}
UGStudent(int n,char *s1,int a,int g)
{
SetValue(n,s1);
age=a;
grade=g;
}
void PrintExtra()
{
cout<<"Age:"<<age<<endl;
cout<<"Grade:"<<grade<<endl;
}
};
int main()
{
UGStudent st1(100,"wang",18,1);
UGStudent st2;
st1.PrintExtra();
st1.print();
cout<<"This is second student:\n";
st2.SetValue(18,"zheng");

st2.print();
st2.PrintExtra();
return 0;
}