inheritance problems

I have to use provided parent classes to create a class called inventory. When i try to compile I get

error C2352: 'Lumber::getlumber' : illegal call of non-static member function

Im really ranking my brain on this one. I am not allowed to make any changes to the parents. How can i call a memberfunction without having to be static?

Code:

The provided class definitions
//  program_id       LUMBER.H
//  written_by       Hi Lo Jo
//  company          The Woods of Colorado Springs, CO
//
//  description      This header file contains the class definitions 
//                   needed for the program: STORELUMBER.CPP. 
//                   The method definitions are in the file LUMBER.CPP
//

#ifndef LUMBER
#define LUMBER

const short LEN = 40;       // maximum length of strings 

class Type                // type of lumber
{
   private:
      char dimensions[LEN];
      char grade[LEN];
   public:
      Type();                     // constructor (no args)
	
      Type(char di[], char gr[]);  // constructor (two args)
	
      void gettype();              // get type from user

      void showtype();             // display type

      char * show_grade();         // displays the grade

      char * show_dimensions();    // displays the dimensions
};

class Distance                    // English Distance class
{
   private:
      short feet;
      double inches;
   public:
      Distance();                  // constructor (no args)
	
      Distance(short ft, double in);  // constructor (two args)

      void getdist();              // get length from user

      int show_feet();             // shows the feet

      double show_inches();        // shows the inches

      void showdist();             // display distance	
};

class Lumber : public Type, public Distance
{
   private:
      short quantity;                      // number of pieces
      double price;                       // price of each piece
   public:
      Lumber(); // constructor (no args)  
						 // constructor (6 args)
      Lumber( char di[], char gr[],      // args for Type
	      short ft, double in,          // args for Distance
		  short qu, double prc ); 

      void getlumber();                    // gets from the keyboard the lumber values
	
      void showlumber();                   // displays on the screen the values

      int show_quantity();                 // diplays on the screen the quantity

      double show_price();                 // diplays on the screen the  price
};


#endif


}

Code:

The provided class method definitions, i cut out a lot to save some space
//  program_id       LUMBER.CPP
//  written_by       Hi Lo Jo
//  company          The Woods of Colorado Springs, CO
//
//  description      This file contains the class method definitions 
//                   needed for the program: STORELUMBER.CPP. 
//                   The class definitions are in the file LUMBER.H


#include<iostream>
#include<string>

using namespace std;

#include"lumber.h"


// type of lumber function definitions

Type::Type()                      // constructor (no args)
{ 
    strcpy(dimensions, "N/A"); strcpy(grade, "N/A"); 
}

Type::Type(char di[], char gr[])  // constructor (two args)
{ 
    strcpy(dimensions, di); strcpy(grade, gr); 
}
     
void Type::gettype()              // get type from user
{
    cout << "   Enter nominal dimensions (2x4 etc.): ";
    cin >> dimensions;
    cout << "   Enter grade (rough, const, etc.): ";
    cin >> grade;
}

void Type::showtype()             // display type
{
    cout << "\n   Dimensions: " << dimensions;
    cout << "\n   Grade: " << grade;
}

char * Type::show_grade()
{
    return grade;
}

char * Type::show_dimensions()
{
    return dimensions;
}

// Distance class function definitions

Distance::Distance()                  // constructor (no args)
{ 
    feet = 0; inches = 0.0; 
}

Distance::Distance(short ft, double in)  // constructor (two args)
{
    feet = ft; inches = in; 
}

void Distance::getdist()              // get length from user
{
    cout << "   Enter feet: ";  cin >> feet;
    cout << "   Enter inches: ";  cin >> inches;
}

void Distance::showdist()             // display distance
{ 
    cout  << feet << "\'-" << inches << '\"'; 
}

int Distance::show_feet()
{
    return feet;
}

double Distance::show_inches()
{
    return inches;
}

// Lumber class function definitions

Lumber::Lumber() : Type(), Distance()      // constructor (no args)
{ 
    quantity = 0; price = 0.0; 
}
					 // constructor (6 args)
Lumber::Lumber( char di[], char gr[],      // args for Type
	      short ft, double in,          // args for Distance
	      short qu, double prc ) :      // our own args
	      Type(di, gr),              // call Type constructor
	      Distance(ft, in)           // call Distance constr
{
    quantity = qu; price = prc;     // use our own args
}

void Lumber::getlumber()
{
    Type::gettype();
    Distance::getdist();
    cout << "   Enter quantity: "; cin >> quantity;
    cout << "   Enter price per piece: "; cin >> price;
}

Code:

class i wrote that uses the parents lumber and date, i did not attach date
//newLumber.h
#include "lumber.h"
#include "date.cpp"

#ifndef INVENTORY
#define INVENTORY

//Derived class from parents lumber and date
class inventory : public LUMBER DATE
{
private:
	long inventoryNumber;

protected:



public:
	inventory();
	void	enterSku();
};

#endif

Code:

Class member functions
//newLumber.cpp
#include <iostream>
#include "newLumber.h"

using namespace std;


 //member function that will create a new sku
void  inventory::enterSku() 
{ 
	cout << "What is the SKU number?" << endl;
	cin >> inventoryNumber;
	Lumber::getlumber();
}

So... you are getting an error with the date class and that is the one thing you don't show us?

Oh... you should not include source files. If you really have a multi-file project, the accepted way to generate the program is to compile all the source files into object files and then link those object files into an executable. How you do that depends on if you are using an IDE of some sort or a command line tool.

Originally Posted by hk_mp5kpdw

So... you are getting an error with the date class and that is the one thing you don't show us?

Oh... you should not include source files. If you really have a multi-file project, the accepted way to generate the program is to compile all the source files into object files and then link those object files into an executable. How you do that depends on if you are using an IDE of some sort or a command line tool.

hah, oops, it doesn't matter which function i call, i still get the same error. I was just goofing around and forgot to change it looks like. Ill worry about including the source files later heh

How about:

Code:

Lumber mylumber;
mylumber.getlumber();

That works.. But i still have some questions. What we did there was create another class of the type lumber right? So wouldn't i have a class inventory that contains lumber, type, distance, and date AND another class of lumber than contains type and distance as well?


What i want to be able to do is create an array[100] of the class inventory and be able to add items.

Ah my bad, I see what you are doing now. It seems like doing it that way should work (although It's been awhile since I used inheritance much). I don't think you need to disambiguate the call to getlumber, try just:

Code:

void  inventory::enterSku() 
{ 
	cout << "What is the SKU number?" << endl;
	cin >> inventoryNumber;
	getlumber();
}

I hope this line is just a typo:

Code:

class inventory : public LUMBER DATE
//should be
class inventory: public Lumber,public Date