need help with using f'riend' to design this program. also, overloading.

[simplyscottif]

Design a PhoneCall class that holds a phone number to which a call is placed, the length of the call in minutes, and the rate charged per minute. Overload extraction and insertion operations for the class.

Overload the == operator to compare two PhoneCalls. Consider one PhoneCall to be equal to another if both calls are placed to the same number.

Create a main() function that allows you to enter 10 PhoneCalls into an array. If a PhoneCall is already been placed to a number, do not allow a second PhoneCall to the same number

I'm pretty good at logic so i think i can figure that part out, its the syntax and the declarations that i cant wrap my head around

please help!
thank you.

[simplyscottif]

i guess the main thing for now is i need help starting this program... what should the declarations at the top look like?
what should the class look like?
stuff like that

[simplyscottif]

#include "stdafx.h"


class PhoneCall
{
	friend ostream& operator<<(ostream&, const PhoneCall&);
private:
	double callRate;
	int callLength, phoneNumber;
public:
	PhoneCall(int, double, int);
	void setLength(int const *length);
    void setRate(double const *rate);
    void setPhoneNumber(int const *num);
	int operator==(const PhoneCall& aPhone);

};

void PhoneCall::setLength(int const *length)
    {
        delete length;
        //length = strdupnew(length);
    }

void PhoneCall::setRate(double const *rate)
{
	delete rate;
	//rate=strdupnew(rate);
}

void PhoneCall::setPhoneNumber(int const *num)
{
	delete num;
	//num=strdupnew(num);
}


PhoneCall::PhoneCall(int length, double rate, int num)
{
	callLength=length;
	callRate=rate;
	phoneNumber=num;
}



	ostream &operator<<(ostream& out, const PhoneCall& aPhone)
		{
        return
            out <<
                "Call Length:    " << aPhone.callLength() <<
                "Call Rate: " << aPhone.callRate() <<
                "Phone Number:   " << aPhone.phoneNumber();
    }

	int PhoneCall::operator==(const PhoneCall& aPhone)
	{
		int truth=0;
		if(phoneNumber=aPhone.phoneNumber)
			truth=1;
		return truth;
	}




	
	int main()
	{
		PhoneCall aPhone(10, 5.25, 1234567);
		cout<< aPhone;
		return 0;
		system("pause");
	
	}

[simplyscottif]

#include "stdafx.h"


class PhoneCall
{
	friend ostream& operator<<(ostream&, const PhoneCall&);
private:
	double callRate;
	int callLength, phoneNumber;
public:
	PhoneCall(int, double, int);
	void setLength(int const *length);
    void setRate(double const *rate);
    void setPhoneNumber(int const *num);
	int operator==(const PhoneCall& aPhone);
	ostream& operator<<(const PhoneCall& aPhone);

};

void PhoneCall::setLength(int const *length)
    {
        delete length;
        //length = strdupnew(length);
    }

void PhoneCall::setRate(double const *rate)
{
	delete rate;
	//rate=strdupnew(rate);
}

void PhoneCall::setPhoneNumber(int const *num)
{
	delete num;
	//num=strdupnew(num);
}


PhoneCall::PhoneCall(int length, double rate, int num)
{
	callLength=length;
	callRate=rate;
	phoneNumber=num;
}



	ostream &operator<<(ostream& out, const PhoneCall& aPhone)
		{
        return
            out <<
                "Call Length:    " << aPhone.callLength() <<
                "Call Rate: " << aPhone.callRate() <<
                "Phone Number:   " << aPhone.phoneNumber();
    }

	int PhoneCall::operator==(const PhoneCall& aPhone)
	{
		int truth=0;
		if(phoneNumber=aPhone.phoneNumber)
			truth=1;
		return truth;
	}




	
	int main()
	{
		PhoneCall aPhone(10, 5.25, 1234567);
		cout<< aPhone;
		return 0;
		system("pause");
	
	}

[simplyscottif]

#include "stdafx.h"
#include<conio.h>


class PhoneCall
{
	friend ostream& operator<<(ostream&, const PhoneCall&);
	friend istream& operator>>(istream&, PhoneCall&);
private:
	double callRate;
	int callLength, phoneNumber;
public:
	PhoneCall(int, double, int);
	void setLength(int);
	void setNumber(int);
	void setRate(double);
	//void setLength(int const *length);
   // void setRate(double const *rate);
    //void setPhoneNumber(int const *num);
	int operator==(const PhoneCall& aPhone);
	//ostream& operator<<(const PhoneCall& aPhone);

};


void PhoneCall::setLength(int l)
{
	
	cout<<"enter the length of the phone call";
	cin>>l;
	return;
}

void PhoneCall::setRate(double r)
{
	
	cout<<"enter rate per minute";
	cin>>r;
	return;
}

void PhoneCall::setNumber(int n)
{
	
	cout<<endl<<"enter phone number in format xxxxxxx";
	cin>>n;
	return;
}


/*void PhoneCall::setLength(int const *length)
    {
        delete length;
        //length = strdupnew(length);
    }

void PhoneCall::setRate(double const *rate)
{
	delete rate;
	//rate=strdupnew(rate);
}

void PhoneCall::setPhoneNumber(int const *num)
{
	delete num;
	//num=strdupnew(num);
}
*/

PhoneCall::PhoneCall(int length, double rate, int num)
{
	callLength=length;
	callRate=rate;
	phoneNumber=num;
}



	ostream &operator<<(ostream& out, const PhoneCall& aPhone)
		{
        return
            out <<
                "Call Length:    " << aPhone.callLength <<endl<<
                "Call Rate: " << aPhone.callRate <<endl<<
                "Phone Number:   " << aPhone.phoneNumber<<endl;
    }

	istream& operator>>(istream& in, PhoneCall& aPhone)
	{
		cout<<endl;
		cout<<"enter call length in minutes, round to the nearest minute";
		in>>aPhone.callLength;
		cout<<endl<<"enter rate per minute in dollars and cents";
		in>>aPhone.callRate;
		cout<<endl<<"enter phone number in form xxxxxxx";
		in>>aPhone.phoneNumber;
		return in;
	}



	int PhoneCall::operator==(const PhoneCall& aPhone)
	{
		int truth=0;
		if(phoneNumber=aPhone.phoneNumber)
			truth=1;
		return truth;
	}




	
	int main()
	{
		
		
		PhoneCall aPhone(0, 0, 0);
		cin>>aPhone;
		cout<< aPhone;

		//return 0;
		//system("pause");
		getche();
	
	}

[simplyscottif]

i think i did part a and b
so now i need to somehow let a user enter 10 PhoneCalls into an array and compare them so the same phone number isnt entered twice....whats the syntax on that kind of array?
and i overloaded == to compare phone numbers so how do i use that in the main() to stop from repeating the same phone number twice?

please help!!! i am trying, just failing hardcor3

[sfuo]

This is what I would do for your main() function.

int main()
{
	bool numberUsed;
	PhoneCall calls[10];
	for( int i = 0; i < 10; i++ )
	{
		do
		{
			numberUsed = false;
			cin >> calls[i];
			for( int c = 0; c < 10; c++ ) //go through all phone calls
				if( c != i ) //if is not the same phone call
					if( calls[i].phoneNumber == calls[c].phoneNumber ) //if the numbers match
						numberTaken = true; //number is taken
			
		}while(numberUsed); //do while numberTaken is true
	}
	
	for( int i = 0; i < 10; i++ )
	{
		cout << calls[i];
	}
	
	system("pause");
	return 0;

}

Change the constructor for your PhoneCall class to PhoneCall(int length = 0, double rate = 0, int num = 0); This way when you make the PhoneCalls and do not specifiy a value for each variable it just defaults them to zero.

[sfuo]

OK my above post works but there are a few things that you have to do that I missed out.
-First change line 14 to numberUsed (not sure why I put numberTaken)
-Either create a getPhoneNumber() function that returns the phoneNumber or make it public (up to you)
-Add an error message saying that the phone number is taken and I would also output something showing what PhoneCall you are entering for (could use the i counter +1)

[simplyscottif]

thank you so much, im very close now...however i am getting error c4430... did i set up what you suggested correctly?

#include "stdafx.h"
#include<conio.h>


class PhoneCall
{
	friend ostream& operator<<(ostream&, const PhoneCall&);
	friend istream& operator>>(istream&, PhoneCall&);
private:
	double callRate;
	int callLength;
public:
	PhoneCall(int, double, int);
	int phoneNumber;
	int getPhoneNumber(int);
	void setLength(int);
	void setNumber(int);
	void setRate(double);
	//void setLength(int const *length);
   // void setRate(double const *rate);
    //void setPhoneNumber(int const *num);
	int operator==(const PhoneCall& aPhone);
	//ostream& operator<<(const PhoneCall& aPhone);

};


void PhoneCall::setLength(int l)
{
	
	cout<<"enter the length of the phone call";
	cin>>l;
	return;
}

void PhoneCall::setRate(double r)
{
	
	cout<<"enter rate per minute";
	cin>>r;
	return;
}

void PhoneCall::setNumber(int n)
{
	
	cout<<endl<<"enter phone number in format xxxxxxx";
	cin>>n;
	return;
}


/*void PhoneCall::setLength(int const *length)
    {
        delete length;
        //length = strdupnew(length);
    }

void PhoneCall::setRate(double const *rate)
{
	delete rate;
	//rate=strdupnew(rate);
}

void PhoneCall::setPhoneNumber(int const *num)
{
	delete num;
	//num=strdupnew(num);
}
*/

PhoneCall::PhoneCall(int length=0, double rate=0, int num=0)
{
	callLength=length;
	callRate=rate;
	phoneNumber=num;
}

PhoneCall::getPhoneNumber(int n=0)
{
	phoneNumber=n;

	
}



	ostream &operator<<(ostream& out, const PhoneCall& aPhone)
		{
        return
            out <<
                "Call Length:    " << aPhone.callLength <<endl<<
                "Call Rate: " << aPhone.callRate <<endl<<
                "Phone Number:   " << aPhone.phoneNumber<<endl;
    }

	istream& operator>>(istream& in, PhoneCall& aPhone)
	{
		cout<<endl;
		cout<<"enter call length in minutes, round to the nearest minute";
		in>>aPhone.callLength;
		cout<<endl<<"enter rate per minute in dollars and cents";
		in>>aPhone.callRate;
		cout<<endl<<"enter phone number in form xxxxxxx";
		in>>aPhone.phoneNumber;
		return in;
	}



	int PhoneCall::operator==(const PhoneCall& aPhone)
	{
		int truth=0;
		if(phoneNumber=aPhone.phoneNumber)
			truth=1;
		return truth;
	}




	
	int main()
	{
		
		
		PhoneCall aPhone(0, 0, 0);
		cin>>aPhone;
		cout<< aPhone;

		//return 0;
		//system("pause");
		//getche();
	
	
   
      

      bool numberUsed;

      PhoneCall calls[10];
   
      for( int i = 0; i < 10; i++ )
   
      {
 
      do

      {
   
      numberUsed = false;
  
      cin >> calls[i];

      for( int c = 0; c < 10; c++ ) //go through all phone calls

      if( c != i ) //if is not the same phone call
 
      if( calls[i].phoneNumber == calls[c].phoneNumber ) //if the numbers match
  
      numberUsed = true; //number is taken
  
       
  
      }
	  while(numberUsed); //do while numberTaken is true
  
      }

       

      for( int i = 0; i < 10; i++ )
  
      {
 
      cout << calls[i];
 
      }
 
      system("pause");

      return 0;
 
      }

[sfuo]

Close but here are the changes that stuck out for me

class PhoneCall
{
	//private stuff
	public:
	PhoneCall(int length = 0, double rate = 0, int num = 0); //set values on prototype
	//rest of public stuff
	
};

PhoneCall::PhoneCall(int length, double rate, int num) //do not set the values on this one
{
	callLength = length;
	callRate = rate;
	phoneNumber = num;
}

[simplyscottif]

Close but here are the changes that stuck out for me

class PhoneCall
{
	//private stuff
	public:
	PhoneCall(int length = 0, double rate = 0, int num = 0); //set values on prototype
	//rest of public stuff
	
};

PhoneCall::PhoneCall(int length, double rate, int num) //do not set the values on this one
{
	callLength = length;
	callRate = rate;
	phoneNumber = num;
}

ohhh, i see what you mean
ok, i changed that
i still have error c4430 on line 80 tho...not really sure why

[sfuo]

Because you made the same mistake as your constructor you only assign values to parameters in prototypes or if there is no prototype.

So you have int n = 0 when you want that to just be int n and then inside your prototype (the function definition within the class) you put int n = 0

[simplyscottif]

Because you made the same mistake as your constructor you only assign values to parameters in prototypes or if there is no prototype.

So you have int n = 0 when you want that to just be int n and then inside your prototype (the function definition within the class) you put >int n = 0

if im understanding you correctly and i hope i am, up in the class definition in public i put:

int getPhoneNumber(int n=0);

and then in the declaration i have:

PhoneCall::getPhoneNumber(int n)
{
    phoneNumber=n;
}

im still getting error c4430 in the same spot.

[sfuo]

The problem is that you have no return type on this.

PhoneCall::getPhoneNumber(int n)
{
	phoneNumber=n;	
}

Your phone number is an int so you want

int PhoneCall::getPhoneNumber(int n)
{
	phoneNumber=n;	
}

[simplyscottif]

The problem is that you have no return type on this.

PhoneCall::getPhoneNumber(int n)
{
	phoneNumber=n;	
}

Your phone number is an int so you want

int PhoneCall::getPhoneNumber(int n)
{
	phoneNumber=n;	
}

it works!!!!
EUREKA!
you are the man
thank you