//Kyu Bae
//Program 13B
//3-28-00
//Purpose:
//This program provides the opportunity to :
//1) Use file operators to fill an array.
//2) Reinforce objectives of previous lab projects.



#include <iomanip.h>
#include <fstream.h>
void CheckNum (int *iProductIdPtr,int *iQuantityPtr);
void PrintInvoice(int *iProductIdPtr, int *iQuantityPtr);
void ReportFirst(int *iNumCode, int *iNumVolume);

//input: none
//call check function and print function
//output : return o

int main (void)
{
	int iProductIdArr[8];
	int iQuantityArr[8] = {0};
	char cAnswer;
	int i=0;

	ifstream InputFile;
	InputFile.open("A:\\DataFile.txt",ios::nocreate);
	if (InputFile.fail())
	{
		cout<<"File open error!" <<endl;
		return 0;
	}
	cout <<"File successfully opened"<<endl;
	cout <<"Now reading informations from the file."<<endl;
	while(!InputFile.eof())
	{
		InputFile >> iProductIdArr[i];
		i++;
	}
	InputFile.close();


	do
	{
		cout<<"Do you have a order to place? "<<endl;
		cin>>cAnswer;
	
	if(cAnswer=='n' || cAnswer=='N')
		break;
	else
		CheckNum( iProductIdArr, iQuantityArr);
	}
	while (cAnswer=='Y'|| cAnswer=='y');
	
	PrintInvoice( iProductIdArr, iQuantityArr);

	return 0;

}
//input: iProductIdArr
//enter product number and number of order they place 
//output: none

void CheckNum (int *iProductIdPtr,int *iQuantityPtr)
{
	
	int iItemNum;
	int iHowMany;
	int i;
		cout<<"Enter the product Number: "<<endl;
		cin>>iItemNum;
	  
	for (i=0; i<8 && iItemNum != *iProductIdPtr; i++)
		  ; //null loop
		
	if (i<8)
		{ cout<<"How many do you want to order? "<<endl;
		cin>>iHowMany;
		 *iQuantityPtr=*iQuantityPtr+ iHowMany;
	
		}
	else

	cout<<"You entered invalid product number!!!"<<endl;

	
}
//input: product number and quantity of product.
//print the total list of product and quantity of product.
//output: none.

void PrintInvoice(int *iProductIdPtr, int *iQuantityPtr)
{
	int i;
	
	cout<<setw(10)<<"**********"<<setw(20)<<"**********"<<endl;
	cout<<setw(10)<<"ProductNum"<<setw(20)<<" Quantity "<<endl;
	cout<<setw(10)<<"**********"<<setw(20)<<"**********"<<endl;

	for (i=0;i<8;i++,*iProductIdPtr++, *iQuantityPtr++)
		cout<<setw(10)<<*iProductIdPtr<<setw(20)<<*iQuantityPtr<<endl;


}
void ReportFirst(int *iNumCode, int *iNumVolume)
{
	int c;
	for (c=0; c<8; c++)
		 cout<< *iNumCode++<<"   "<<*iNumVolume++<<endl;

}