Getting Values from a baseclass into the method of a derived class

[Sandz]

Please help thank you.

Work is the baseclass

Work::Work(void)
{
}

void Work::setWork(int num, double hour, double rates)
{
	worknum = num;
	workhour = hour;
	rate = rates;
}

WorkBid = derived class

WorkBid::WorkBid(void)
{
}

void WorkBid::setWorkBid(int bidid, Work bid, double quote)
{
	bidnum = bidid;
	bidwork = bid;
	quotation = quote;
}

[o3hC5Di1]

Hi there,

I'm afraid we will need a little bit more information than what you are giving in the subject line. Please share your code and specifically tell us what you are trying to do.

All the best,
NwN

[MiiNiPaa]

Please elaborate.
Do you want to create array inside of class which size will be known at compile time?
And how cin relates to your question?

[Sandz]

Hi,

I have no idea how to start.
I was tasked to set an array to a class.
The number of arrays however is user defined which means that it is not a constant and I cant use the normal method to array the class as it is not a constant.

Please guide me. Thank you so much

[MiiNiPaa]

You should use dynamic allocated array initializated in constructor:

class Test
{
  public:
    int* array;
    int size;    

    Test() : size(1)//Default constructor, creating one element array
    {
         array = new int[size];
    }
    
    Test(int n) : size(n) //parametrized constructor, creating array of size n
    {
        array = new int[size];
    }

    ~Test() //destructor: deleting array to prevent memory leak
    {
        delete[] array;
    }
};

//usage:
Test var(6);
for(int i = 0; i < var.size; ++i)
    std::cin >> var.array[i]; //Fill internal array from cin 

[Sandz]

Hello MiiNiPaa,

I dun quite understand.

I changed my code from your example.
This is a portion of my code in the test driver.

I wanted to assign an array into a class. (RollBid)
but it still state numbits as a non-constant, so I cant assign.

	cout << "Enter number of Bids: ";
		cin >> numbids;
		int* array = new int[numbits];
		RollBid bid[numbits];

[o3hC5Di1]

Hi there,

Seems you have a typo in here:

cin >> numbids;  //this says numbiDs
int* array = new int[numbits];  //these say numbiTs
RollBid bid[numbits];

I thinkyou will have to share more of your code if you want us to help you more specifically.

All the best,
NwN

[nvrmnd]

I'm not really sure what you want

In My Opinion ... I think the proper question is how to create an array of objects.

If you want to create an array of objects, you should do it as follows:

cout << "Enter number of Bids: ";
cin >> numbids;

RollBid* pointer_name = new RollBid [numbids];


/* and somewhere in your main: */
delete [] pointer_name;

note: It would be better to us if you show your class declaration and constructor definition

[MiiNiPaa]

	cout << "Enter number of Bids: ";
		cin >> numbids;
		int* array = new int[numbits];
		RollBid bid[numbits];

Why are you creating an array of ints if you need an array of RollBids?

change third line to RollBid* bid = new RollBid[numbids]; and delete fourth line

[Sandz]

Thank you! It worked. Now I have another problem.

I have to get data from a class into another class. But I cant do it correctly.
Please see below for my code. line 33 in int main().
My operator is also not working. Please help thank you.

#pragma once
#include <iostream>
using namespace std;

class Work
{
private:
	int worknum;
	double workhour;
	double rate;

public:
	Work();
	void setWork (int, double, double);
	double getbaseprice();
	void display();
};

#pragma once
#include "work.h"

class WorkBid :
	public Work
{
private:
	int bidnum;
	Work bidwork;
	double quotation;

public:
	WorkBid();
	void setWorkBid(int, Work, double);
	void displayWorkBid();
	int operator<(WorkBid&);
};

#include "Work.h"


Work::Work(void)
{
}

void Work::setWork(int num, double hour, double rates)
{
	worknum = num;
	workhour = hour;
	rate = rates;
}

double Work::getbaseprice()
{
	double baseprice = workhour * rate;

	return baseprice;
}

void Work::display()
{
	cout << "Work number " << worknum << endl;
	cout << "Work hour " << workhour << endl;
	cout << "Rate " << rate << endl;
	cout << "The baseprice is: $" << getbaseprice() << endl;
}

#include "WorkBid.h"


WorkBid::WorkBid(void)
{
}

void WorkBid::setWorkBid(int bidid, Work bid, double quote)
{
	bidnum = bidid;
	bidwork = bid;
	quotation = quote;
}

void WorkBid::displayWorkBid()
{
	cout << "Bid number " << bidnum << endl;
	cout << "Quotation " << quotation << endl;
	display();
	cout << endl;
}

int WorkBid::operator < (WorkBid& quote)
{
	if (quotation < getbaseprice())
	{return 1;}

	else
	return 0;
}

#include "Work.h"
#include "WorkBid.h"

int main()
{
	WorkBid work2;
	Work work1;
	int n, bids, i;
	double h, r, quote, baseprice;
	char stop = 'A';

	while (toupper(stop)!='S')
	{

		cout << "Enter Work number ";
		cin >> n;
		cout << "Enter Work hour ";
		cin >> h;
		cout << "Enter Rate ";
		cin >> r;

		work1.setWork(n, h, r);
		baseprice = work1.getbaseprice();
	
		cout << "Enter number of Bids ";
		cin >> bids;
		WorkBid* work2 = new WorkBid[bids];

		for (i=1; i < bids+1; i++)
		{
			cout << "Enter Quotation " ;
			cin >> quote;
			work2[i].setWorkBid(i, work1, quote); 
			work2[i].displayWorkBid();
		}

		cout << "S to stop ";
		cin >> stop;

	}
}

[MiiNiPaa]

Make work bid to not inherit from work and change line 19 in WorkBid.cpp:
display(); → bidwork.display();

[Sandz]

WOW!!! it worked!

What about line 33? Am I setting in the values correctly?

How about my operator part?
Is it correct? How should I call out the operator in the int main()?

Thank you so much MiiNiPaa!

[MiiNiPaa]

What should that operator do?

[Sandz]

What about line 33? Am I setting in the values correctly?

The operator will determine the quote.
If quote is more than the baseprice, it returns a 1, else 0.
Located in WorkBid.cpp last part

[MiiNiPaa]

You do not need an operator for that. Operator< should compare two different variable by specific parameter. You should make this another member function like display and setBid.

And probably it should return bool, not int.