Question

#include<iostream>
using namespace std;

class StudentClass{
friend class Oopclass;
public:
    StudentClass();
    void setStudentData();
    void printStudentScore();
    StudentClass* next;
    ~StudentClass();
private:
    string std_ID;
    int sID, sMid, sFin, sOP, hw[3];   
    double sTotal; 

};

class OopClass{
friend class StudentClass;
public:
    OopClass();
    void setOopData();
    void printOopScore();
    void queryOopScore();
    void findOopAverageScore();
    void addStudentData();
    void deleteStudentData();
    void updateStudentData();
    ~OopClass();
private:
    string professor, subject;
    int cSn;
    double cSAvg;
    StudentClass* cSAddr;
};

int main(int argc, char **argv){
OopClass Info[3];
Info[0].setOopData();
return 0;
}

StudentClass::StudentClass(){
}
void StudentClass(){
}
void StudentClass::setStudentData() {

}
StudentClass::~StudentClass(){
}
OopClass::OopClass(){
}
void OopClass::setOopData() {
cout << "Professor?" << endl;
cin >> professor;
cout << "Subject?" << endl;
cin >> subject; 
cout << "How many students do you want to input ?" << endl;
int number = 0;
cin >> number;
cSAddr = new StudentClass;
//for(int i = 0; i < number; i ++) setStudentData();

}
OopClass::~OopClass(){
}

When I tired to write “cSAddr = new StudentClass;” ,it come up to

error about

” C:\Users\lypan\Documents\final.cpp In member function ‘void
OopClass::setOopData()’:

63 14 C:\Users\lypan\Documents\final.cpp [Error] expected
type-specifier before ‘StudentClass’

63 14 C:\Users\lypan\Documents\final.cpp [Error] invalid conversion
from ‘int*’ to ‘int’ [-fpermissive]

63 14 C:\Users\lypan\Documents\final.cpp [Error] expected ‘,’ or ‘;’
before ‘StudentClass’ “

And I have no idea why I do wrong, please tell me what I make mistake. Thx!

Answer 1

The only error here is that you didn’t implement the constructors for your classes. But that should yield a linker error.

This probably isn’t your code, but it might be that you don’t include StudentClass.h and OopClass.h (or whatever) in the file where you define OopClass::setOopData().

EDIT:

void StudentClass()

you declare a function called StudentClass on line 46 – http://codepad.org/9DP6zpHU – you probably forgot to qualify it.

StudentClass::StudentClass(){
}
//THIS!
void StudentClass(){
}
void StudentClass::setStudentData() {

}