multi file project error part 2

[dantestwin]

I am now dissecting each file piece by piece. The project consists of 2 header files and 2 definition files plus a main program utilizing both classes. One of the definition files (sales.cpp) compiles fine, the other one (register.cpp) is the one that produces 2 errors. I am going to provide the 2 header files that are needed to be included in the register.cpp, as well as the register.cpp file. Any help that can be given I will appreciate immensely.

sale.h

    enum ItemType {BOOK, DVD, SOFTWARE, CREDIT};

class Sale
{
public:
   Sale();			// default constructor, 
				// sets numerical member data to 0

   void MakeSale(ItemType x, double amt);	

	// the MakeSale function loads data into the Sale object.  The
	// item and price are passed in.  Compute tax and total.
	// (For store credits, tax is 0).

   ItemType Item();		// Returns the type of item in the sale
   double Price();		// Returns the price of the sale
   double Tax();		// Returns the amount of tax on the sale
   double Total();		// Returns the total price of the sale
   void Display();		// outputs sale info (described below)

  // for the Display function, output the sale item, the price, the tax,
  // and the total (all on one line).  For store credit, the amounts
  // should be enclosed in < > symbols, to indicate a negative charge.  
  // All monetary output should be in dollars and cents format, to two
  // decimal places. 
  // Examples:	Book         $ 20.00    Tax:  $ 1.40   Total:  $ 21.40
  //		Credit	    <$ 15.00>   Tax:  $ 0.00   Total: <$ 15.00>

private:
   double price;	// price of item or amount of credit
   double tax;		// amount of sales tax (does not apply to credit)
   double total;	// final price once tax is added in.
   ItemType item;	// transaction type
};

register.h

   //register header file

#include "sale.h"

class Register
{
public:
   Register(int i, double amt);//allows ID number and starting amount
                              //in register to be initialized when
                              //object is created

   int GetID();//returns current ID number in the register to the
               //caller, accessor function

   double GetAmount();//return current amount in the register to
               //caller, accessor function


   void RingUpSale(ItemType c, double amt);//stores sale in sale list
                                          //also updates money amount
                                          //in register.
                                          //allows item type and sale
                                          //base price to be passed in

   void ShowLast();//displays only the info about last sale made

   void ShowAll();//Shows all of sales currently in sale list, one per line

   void Cancel();//cancels last sale in list

   double SalesTax(int n);//calculates and returns total amount of sales tax
                           //for last n sales (i.e. most recent ones)

   private:
     int ID;
     double Amount;
     double sales_taxxx;
     double base_price;
	 int numsales;

	 Sale *sales;
};

register.cpp

    //definitions for register class

#include <iomanip>
#include <iostream>

#include "Register.h"
#include "sale.h"



using namespace std;

//Register definitions

Register::Register(int i, double amt)
{
    ID=i;
    Amount=amt;
	numsales=0;
    //parameters in register are intialized to 0
}

int Register::GetID()
{
    return ID;//returning current ID in register
}

double Register::GetAmount()
{
    return Amount;//returning current amount in refrigerator
}

void Register::RingUpSale(ItemType c, double amt)
{
	Sale *s;

	//create a new array
	//memcpy the old array into the new array byte by byte
	//set the old array to the new array.
	

	numsales++;
	s = new Sale[numsales];
	memcpy(s, sales, sizeof(Sale)*(numsales-1));	
	s[numsales-1].MakeSale(c, amt);
	sales=s;

	if (c==CREDIT) {
		Amount-=amt;
	               } 
    else {
		Amount+=amt;
	     }

}


void Register::ShowAll(void) {

	if (numsales==0) { 
      cout<<"No Sales Have Been Made Silly...."; 
      return;   
                     }

	for (int i=0;i<numsales;i++) {
		sales[i].Display();
		

	                              }





                              }

void Register::ShowLast(void) {
	if (numsales==0) { 
    cout<<"No Sales Have Been Made Silly...."; 
    return; 
                      }
	
	sales[numsales-1].Display();


                               }


void Register::Cancel(void) {
{
	Sale *s;

	if (numsales==0) { 
    cout<<"No Sales Have Been Made Silly...."; 
    return; 
                     }

	//create a new array
	//memcpy the old array into the new array byte by byte
	//set the old array to the new array.
	
	if (s[numsales].Item()==CREDIT) {
		Amount+=s[numsales].Price();
	                                } 
        else {
		Amount-=s[numsales].Price();
	         }


	numsales--;

	s = new Sale[numsales];
	memcpy(s, sales, sizeof(Sale)*(numsales));	

	sales=s;


}


 
                     }



double Register::SalesTax(int n) {
int t_n=0;
double tax_total=0;


if (n<0) {
    cout<<"Invalid Number..."<<endl; 
    return 0;
         }


//figure out how many to count
if (n > numsales) {
	t_n=numsales;
                  } 
   else {
	t_n=n;
        }


//count t_n recent items
for (int i=(numsales-1);i>=(numsales-t_n);i--)
	tax_total+=sales[i].Tax();	


return tax_total;
                                  }

Compiler errors:

    sale.h(14) : error C2011: 'ItemType' : 'enum' type redefinition
    sale.h(17) : error C2011: 'Sale' : 'class' type redefinition