//Inventory Control
#include<fstream> 
#include<iostream> 
#include<string>
using namespace std;
void getItem(string &prod, int &quan, double &price); //add one item from keyboard
void printList(string product[],int quantity[], double price[], int count);
void readFile(string product[],int quantity[], double price[], int &count); //read file
void main (void) //main has 3 arrays and count that are passed to other functions
{ string product[20]={"Widget","Dodad","Thingamajig", "Dohicky"};
  int quantity[20] = {20, 100, 12, 40};
  double price[20] = {12.95, 7.50, 1.25, 6.00};
  int count=4;
  readFile(product, quantity, price, count);
  printList(product,quantity,price,count);
} //main
       
void getFileItem(string &prod, int &quan, double &price, ifstream &input) 
{  //line of input will be: product; quantity; price\n
   input>>prod; 
   input>>quan;
   input>>price;
   input.ignore(100,'\n'); //ignore rest of line trailing blanks and \n
} //getFileItem
void readFile(string product[],int quantity[], double price[], int &count)
{ ifstream prod;  //input file stream
  prod.open("c:/products.txt");
  if (!prod.fail()) //always test for fail: file is missing, disk not there etc. 
  { while (!prod.eof())
    {  getFileItem(product[count],quantity[count],price[count], prod); //read 1 item
       count++; //add one to count, which was passed by reference.
	} //read file
	prod.close(); //close any file you open
  } //file opened and read
} //readFile
void getItem(string &prod, int &quan, double &price) //add one item from keyboard
{  cout<<"Enter name of product:";
   cin>>prod;
   cout<<"Enter quantity:";
   cin>>quan;
   cout<<"Enter price:";
   cin>>price;
  // cin.ignore(100,'\n');
} //getItem

void printList(string product[],int quantity[], double price[], int count)
//print list of all items
{  cout<<"PRODUCT        \tQUANTITY\tPRICE\n";
   for(int i=0;i<count;i++)
   {  cout<<product[i];
      for(int s=product[i].length(); s<15;s++)//print spaces to width of 25
		cout<<" ";
      cout<<"\t"<<quantity[i]<<"\t\t"<<price[i]<<"\n";
   } //line up columns and format decimal
} //printList