//Inventory Control
#include<fstream.h> //iostream is a subset of fstream.
#include<string.h>  //to use strlen
#include <iomanip.h> //to use setw

void getItem2(char prod[], int &quan, double &price); //input as 1 line
void getItem(char prod[], int &quan, double &price); //add one item from keyboard
void printList(char product[][12],int quantity[], double price[], int count);
void spaces(int num);
void readFile(char product[][12],int quantity[], double price[], int &count);
void getFileItem(char prod[], int &quan, double &price, ifstream &input);
void main (void) //main has 3 arrays and count that are passed to other functions
{ char product[20][12]={"Widget","Dodad","Thingamajig", "Dohicky"};
  int quantity[20] = {20, 100, 12, 40};
  double price[20] = {12.95, 7.50, 1.25, 6.00};
  int count=0;
  readFile(product,quantity,price,count);
  printList(product,quantity,price,count);
} //main
       
void getItem2(char prod[], int &quan, double &price) //input as 1 line
{  //line of input will be: product; quantity; price\n
   cout<<"Enter name of product; quantity; price:";
   cin.getline(prod,12,';'); //stop at the ;
   if (strlen(prod)==11) //maximum letters read, get rid of extra letters and ;
      cin.ignore(40,';'); 
   cin>>quan;
   cin>>price;
   cin.ignore(100,'\n'); //ignore rest of line trailing blanks and \n
} //getItem

void getItem(char prod[], int &quan, double &price) //add one item from keyboard
{  cout<<"Enter name of product:";
   cin.getline(prod,11,'\n');
   if (strlen(prod)==11) //maximum letters read, get rid of \n
      cin.ignore(100,'\n');
   cout<<"Enter quantity:";
   cin>>quan;
   cout<<"Enter price:";
   cin>>price;
   cin.ignore(100,'\n');
} //getItem

void spaces(int num)
{ for(int i=0; i<num; i++)
    cout<<" ";
} //print num spaces

void printList(char product[][12],int quantity[], double price[], int count)
//print list of all items
{  cout<<"PRODUCT        QUANTITY\t PRICE\n"; //PRODUCT+8 spaces=15
   for(int i=0;i<count;i++)
   { cout<<product[i];
     spaces(15-strlen(product[i])); //15- length of name
     cout.precision(0);  
     cout.setf(ios::fixed);
     cout<<setw(4)<<quantity[i]; //xxxx = 4
     cout.precision(2); //2 decimal places
     cout<<"\t"<<setw(6)<<price[i]<<"\n"; //xxx.xx =6
   } //for i
} //printList
void readFile(char product[][12],int quantity[], double price[], int &count)
{ ifstream prod;  //input file stream
  prod.open("A:/products.txt");
  if (!prod.fail()) //always test for fail: file is missing, disk not there etc. 
  {  getFileItem(product[count],quantity[count],price[count], prod); //read 1 item
     while(!prod.eof() && count<20)
     {  count++; //add one to count, which was passed by reference.
        getFileItem(product[count],quantity[count],price[count], prod); //try to read
     } //while not end of file
     prod.close(); //close any file you open
  } //file opened and read
} //readFile
void getFileItem(char prod[], int &quan, double &price, ifstream &input) 
{  //line of input will be: product; quantity; price\n
   input.getline(prod,12,';'); //stop at the ;
   if (strlen(prod)==11) //maximum letters read, get rid of extra letters and ;
      input.ignore(40,';'); 
   input>>quan;
   input>>price;
   input.ignore(100,'\n'); //ignore rest of line trailing blanks and \n
} //getFileItem