/* Filename:  makeform.cpp

   Author:  Br. David Carlson

   Date:  February 1, 1998

   Last Modified:  February 21, 2013

   This program prompts the user for the name of a file to create.  Then
   it asks the user to repeatedly enter the name of a product and its 
   price.  This data is written to a text file having the name that the
   user specified.  CTRL z is used to stop data entry.  (Substitute CTRL
   d in Linux.)

   Tested with:
      Microsoft Visual C++ 2008
      g++ under Linux
*/

#include <iostream>
#include <fstream>   // needed for files
using namespace std;

const int MaxString = 120;
typedef char StringType[MaxString];

void WriteToFile(fstream & OutFile);


int main(void)
   {
   StringType FileName;
   fstream OutFile;

   cout << "Enter the name of the text file to be created: ";
   cin.getline(FileName, MaxString);

   OutFile.open(FileName, ios::out);
   if (OutFile.fail())
      {
      cerr << "Could not create file " << FileName << endl;
      exit(1);
      }

   WriteToFile(OutFile);
   OutFile.close();   // very important to close an output file
   return 0;
   }


/* Given:  OutFile   A file stream already opened for output.
   Task:   To repeatedly get a product name and price from the user and write them to OutFile.
   Return: OutFile   The modified file stream.
*/
void WriteToFile(fstream & OutFile)
   {
   StringType ProductName;
   float Price;

   // change to CTRL d for Linux:
   cout << "Enter a product name (or press CTRL z to quit):" << endl;
   cin.getline(ProductName, MaxString);

   while (! cin.fail())
      {
      cout << "Enter the price of this product:" << endl;
      cin >> Price;
      cin.get(); // read in the newline and discard it
      OutFile << ProductName << ' ' << Price << endl;
      // change to CTRL d for Linux:
      cout << "Enter the product name (or press CTRL z to quit):" << endl;
      cin.getline(ProductName, MaxString);
      }
   }