Question

I’ve been instructed to create two Classes: Customer and Barber,
Barber should have a function : cutHair() that can change the value of private member hairLength in Customer.

Customer.h

#ifndef CUSTOMER_H
#define CUSTOMER_H
#include "barber.h"
#include <iostream>
#include <string>
using namespace std;  

class Customer{
    public:
        friend void Barber::cutHair(Customer &someGuy);
        Customer(string name, double hairLength);
        string getName();
        double getHair();
        void setHair(double newHair);
    private:
        string name;
        double hairLength;
};
#endif

Barber.h

#ifndef BARBER_H
#define BARBER_H
#include <iostream>
#include <string>
#include "customer.h"
using namespace std;
class Customer;
class Barber{
    public:
        Barber(string barberName);
        void cutHair(Customer &someGuy);
    private:
        string name;
        double takings;
};
#endif

barber.cpp EDIT: I changed the implementation of cutHair() to take advantage of the friend declaration instead of accessing the private members of class Customer through it’s public accessor methods

#include "barber.h"
#include <string>

Barber::Barber(string barberName){
        name = barberName;
        takings = 0;
}
void Barber::cutHair(Customer &someGuy){
        takings += 18;
        someGuy.hairLength = someGuy.hairLength * 80 / 100; 
}

customer.cpp

#include "customer.h"
#include <string>

Customer::Customer(string customerName, double custHairLength){
        name = customerName;
        hairLength = custHairLength;
}
double Customer::getHair(){
        return hairLength;
}
void Customer::setHair(double newLength){
        hairLength = newLength;
}

when attemping to build i get the error message

customer.h(10): error C2653: 'Barber' : is not a class or namespace name

been doing research and canceling out issues one after another for a few days now.
hope someone can come to my rescue 🙂

Answer 1

In Barber.h you are forward declaring Customer (class Customer;) AND including #include Customer.h". Try removing the include. Of course you will have to add the include in your Barber.cpp