Question

error C2504: 'Cperson' : base class undefined

#include<iostream>
using namespace std;
class CPerson
{
public:
char *Name;
char *Number;
char *Sex;
int Age;

setmessage(char *Name,char *Number,char *Sex,int Age);

showmessage();

};

class Student : public Cperson
{
private:
char *sname;
char *sno;
char *ssex;
int sage;

public: setmessage(char *sname,char *sno,char *ssex,int sage);
void showmessage()
{
//cout<<*sname<<'+'<<*sno<<'+'<<*ssex<<'+'<<sage<<endl;
cout<<*sname<<*sno<<*ssex<<sage<<endl;
}

};

void main()
{
Student s;
s.setmessage("小","941941941","妖",37);

s.showmessage();
}
报错
--------------------Configuration: test3 - Win32 Debug--------------------
Compiling...
test3.cpp
C:\C++\test3\test3.cpp(18) : error C2504: 'Cperson' : base class undefined
Error executing cl.exe.

test3.exe - 1 error(s), 0 warning(s)

Answer 1

你定义的 class CPerson 第二字母p是大写的，但class Student : public Cperson 这里的p是小写的

Answer 2

#include<iostream>
using namespace std;
class CPerson
{
public:
char *Name;
char *Number;
char *Sex;
int Age;
setmessage(char *Name,char *Number,char *Sex,int Age){};
showmessage(){};
};
class Student : public CPerson
{
private:
char *sname;
char *sno;
char *ssex;
int sage;
public:
setmessage(char *sname,char *sno,char *ssex,int sage){};

void showmessage()
{
//cout<<*sname<<'+'<<*sno<<'+'<<*ssex<<'+'<<sage<<endl;
cout<<*sname<<*sno<<*ssex<<sage<<endl;
}
};
void main()
{
Student s;
s.setmessage("小","941941941","妖",37);
s.showmessage();
}