CODEWITHSUNDEEP
c++inheritance
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Reputation: 414

Inheritance - different files (C++)

I'm trying out this inheritance tutorial in different files, .h and .cpp.

I've done the necessary #include of header files. I couldn't figure out what is wrong with the code, when I am trying to run it. It have the error stating that:

Severity Code Description Project File Line

Error   C2011   'Person': 'class' type redefinition     
Error   C2027   use of undefined type 'Person'      
Error   C2065   'idNum': undeclared identifier  
Error   C2065   'lastName': undeclared identifier   
Error   C2065   'firstName': undeclared identifier      
Error   C2027   use of undefined type 'Person'      
Error   C2065   'idNum': undeclared identifier  
Error   C2065   'firstName': undeclared identifier      
Error   C2065   'lastName': undeclared identifier

below is my code:

Person.h

#include <iostream>
#include <string>

using namespace std;
class Person {

private:
    int idNum;
    string lastName;
    string firstName;
public:
    void setFields(int, string, string);
    void outputData();


};

void Person::setFields(int num, string last, string first) {
    idNum = num;
    lastName = last;
    firstName = first;

}

void Person::outputData()
{
    cout << "ID #" << idNum << " Name: " << firstName << " " << lastName << endl;
}

Customer.h

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

using namespace std;
class Customer :public Person
{

private:
    double balanceDue;
public:
    void setBalDue(double);
    void outputBalDue();
};

void Customer::setBalDue(double bal) {
    balanceDue = bal;
}

void Customer::outputBalDue() {
    cout << "Balance due $ " << balanceDue << endl;
}

main.cpp

#include <iostream>
#include <string>
#include "Customer.h"
#include "Person.h"

using namespace std;

int main() {
    Customer cust;
    //cust.setFields(215, "Santini", "Linda");
    //cust.outputData();
    cust.setBalDue(147.95);
    cust.outputBalDue();

    return 0;

}

Edit: Person.h

#include <iostream>
#include <string>
#ifndef PERSON_H
#define PERSON_H

using namespace std;
class Person {

private:
    int idNum;
    string lastName;
    string firstName;
public:
    void setFields(int, string, string);
    void outputData();


};

void Person::setFields(int num, string last, string first) {
    idNum = num;
    lastName = last;
    firstName = first;

}

void Person::outputData()
{
    cout << "ID #" << idNum << " Name: " << firstName << " " << lastName << endl;
}
#endif

Upvotes: 3

Views: 1811

Answers (1)

Jabberwocky
Jabberwocky

Reputation: 50812

Function definitions should be in a .cpp file, not in a .h file.

You need this:

Customer.cpp

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

using namespace std;

void Customer::setBalDue(double bal) {
    balanceDue = bal;
}

void Customer::outputBalDue() {
    cout << "Balance due $ " << balanceDue << endl;
}

main.cpp

#include <iostream>
#include <string>
#include "Customer.h"
#include "Person.h"

using namespace std;

int main() {
    Customer cust;
    //cust.setFields(215, "Santini", "Linda");
    //cust.outputData();
    cust.setBalDue(147.95);
    cust.outputBalDue();

    return 0;    
}

Person.cpp

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

void Person::setFields(int num, string last, string first) {
    idNum = num;
    lastName = last;
    firstName = first;    
}

void Person::outputData()
{
    cout << "ID #" << idNum << " Name: " << firstName << " " << lastName << endl;
}

In the header files you need include guards.

Customer.h

#ifndef _customer_inc_h_
#define _customer_inc_h_  // Include guard. This makes sure that
                          // Customer.h is included actually only once
                          // to avoid "multiple definition" errors

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

using namespace std;

class Customer :public Person
{

private:
    double balanceDue;
public:
    void setBalDue(double);
    void outputBalDue();
};

#endif

Person.h

#ifndef _person_inc_h_
#define _person_inc_h_

#include <iostream>
#include <string>

using namespace std;

class Person {

private:
    int idNum;
    string lastName;
    string firstName;
public:
    void setFields(int, string, string);
    void outputData();
};
#endif

Upvotes: 3

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