LNK2019 Error. Using classes and arrays to create a cash register database DUE IN A FEW HOURS :(

[Jrinkley1011]

I have an assignment to create a data base for a cash register. We are eventually supposed to use two classes but I was doing one at a time. I am just trying to have my main program initialize the database with little information. The InentoryItem.h and .cpp are both provided by the instructor. I can not figure out why I keep getting errors on my code. The errors are listed below but they all talk of an unresolved external error. Could someone please provide a bit of guidance to me?

//InentoryItem.h

  #ifndef INVENTORYITEM_H
#define INVENTORYITEM_H
#include <cstring>   // Needed for strlen and strcpy

// Constant for the description's default size
const int DEFAULT_SIZE = 51;

class InventoryItem
{
private:
   const char *description;  // The item description
   double cost;        // The item cost
   int units;          // Number of units on hand
   
   // Private member function.
   void createDescription(int size, char *value);


public:
   // Constructor #1
   InventoryItem();

   // Constructor #2
   InventoryItem(const char *desc);
 
   // Constructor #3
   InventoryItem(const char *desc, double c, int u);
        
   // Destructor
   ~InventoryItem();

   // Mutator functions
   void setDescription(const char *d);
   void setCost(double c);
   void setUnits(int u);

   // Accessor functions
   const char *getDescription() const; 
   double getCost() const;
   int getUnits() const;

};

#endif 

//InventoryItem.cpp

  #include "InventoryItem.h"

// Private member function.
void InventoryItem::createDescription(int size, char *value)
{ 
    // Allocate the default amount of memory for description.
    description = new char [size];

    // Store a value in the memory.
    strcpy(description, value); 
}

// Constructor #1
InventoryItem::InventoryItem()
{ 
    // Store an empty string in the description
    // attribute.
    createDescription(DEFAULT_SIZE, "");

    // Initialize cost and units.
    cost = 0.0;
    units = 0; 
}

// Constructor #2
InventoryItem::InventoryItem(const char *desc)
{ 
    // Allocate memory and store the description.
    createDescription(strlen(desc), desc); 

    // Initialize cost and units.
    cost = 0.0;
    units = 0;
}

// Constructor #3
InventoryItem::InventoryItem(const char *desc, double c, int u)
{ 
    // Allocate memory and store the description.
    createDescription(strlen(desc), desc); 

    // Assign values to cost and units.
    cost = c;
    units = u; 
}      

// Destructor
InventoryItem::~InventoryItem()
{
    delete [] description; 
}

// Mutator functions
void InventoryItem::setDescription(const char *d) 
{
    strcpy(description, d); 
}

void InventoryItem::setCost(double c)
{
    cost = c; 
}

void InventoryItem::setUnits(int u)
{
    units = u; 
}

// Accessor functions
const char *InventoryItem::getDescription() const
{
    return description; 
}

double InventoryItem::getCost() const
{
    return cost; 
}

int InventoryItem::getUnits() const
{
    return units; 
}

//Main.cpp

  #include"CashRegister.h"
#include "InventoryItem.h"

void main()
{
//use the inventory item class to create a database
	//use array to store the name, units on hand and cost
	//adjustable wrench, screwdriver, pliers, rachet, socket wrench (5 total)
	const int AMT = 5;
	InventoryItem tools[AMT] =
	{
		InventoryItem(),									//using default constructor
		InventoryItem("Screwdriver"),						//using constructor 2
		InventoryItem("Pliers", 3.75, 35),
		InventoryItem("Rachet", 5.40, 10),
		InventoryItem("Socket Wrench", 5.00, 7)
	};

	char toolA[DEFAULT_SIZE] = "Adjustable Wrench";			//using default constructor
	tools[0].setDescription(toolA);
	tools[0].setCost(4.75);
	tools[0].setUnits(10);

	tools[1].setCost(2.20);									//usinf constructor 2
	tools[1].setUnits(20);


//DISPLAY MENU
	cout << left << "#" << setw(5) << "Item" << setw(20) << "qty on Hand" << endl;
	cout << "----------------------------------------------------------------------";

	system("pause");
}

//ERROR CODES

1 2 3 4 5 6 7 8 9 10 11 12

1

1>Main.cpp 1>c:\users\jbrin\desktop\ciss-242\week 7 assignment 2 (cash register)\week 7 assignment 2 (cash register)\main.cpp(19): warning C4326: return type of 'main' should be 'int' instead of 'void' 1>Main.obj : error LNK2019: unresolved external symbol "public: __thiscall InventoryItem::InventoryItem(void)" (??0InventoryItem@@QAE@XZ) referenced in function _main 1>Main.obj : error LNK2019: unresolved external symbol "public: __thiscall InventoryItem::InventoryItem(char const *)" (??0InventoryItem@@QAE@PBD@Z) referenced in function _main 1>Main.obj : error LNK2019: unresolved external symbol "public: __thiscall InventoryItem::InventoryItem(char const *,double,int)" (??0InventoryItem@@QAE@PBDNH@Z) referenced in function _main 1>Main.obj : error LNK2019: unresolved external symbol "public: __thiscall InventoryItem::~InventoryItem(void)" (??1InventoryItem@@QAE@XZ) referenced in function _main 1>Main.obj : error LNK2019: unresolved external symbol "public: void __thiscall InventoryItem::setDescription(char const *)" (?setDescription@InventoryItem@@QAEXPBD@Z) referenced in function _main 1>Main.obj : error LNK2019: unresolved external symbol "public: void __thiscall InventoryItem::setCost(double)" (?setCost@InventoryItem@@QAEXN@Z) referenced in function _main 1>Main.obj : error LNK2019: unresolved external symbol "public: void __thiscall InventoryItem::setUnits(int)" (?setUnits@InventoryItem@@QAEXH@Z) referenced in function _main 1>C:\Users\Jbrin\Desktop\CISS-242\Week 7 Assignment 2 (Cash Register)\Debug\Week 7 Assignment 2 (Cash Register).exe : fatal error LNK1120: 7 unresolved externals 1>Done building project "Week 7 Assignment 2 (Cash Register).vcxproj" -- FAILED. ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

[Thomas1965]

Seems you didn't include InventoryItem.cpp in your project, so the linker can't find the functions.
Also change void main() to int main()

[coder777]

It looks like InventoryItem.cpp isn't propperly or at all added to your project.