//////////////////////////////////////////////////////////////////////////
//                                name.c                                //
//                                                                      //
// Purpose                                                              //
// =======                                                              //
// The program obtains a finite set of readings from the user           //
// and calculates the "running averages" (which is a set                //
// of values where each value is the average amonst the                 //
// readings read up to the current reading)                             //
// The readings are temporarily stored in an array.                     // 
// The averages are stored in an array.                                 //
// C++ built-in arrays are used.                                        //
//                                                                      //
// Author            Creation Date                                      //
// ======            =============                                      //
// AY                20 November 2003                                   //
//                                                                      //
// Input/Output                                                         //
// ============                                                         //
// The input is the number of readings (int) and the readings (double). //
// The input is expected to be from a file - the name of the file is    //
// entered by the user                                                  //
// The output is the set of averages (doubles) where the averages(i) is //
// equal to the average value among all readings                        //
// These averages are stored in another file, whose name is also        //
// entered by the user                                                  //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main()
{
  
 const int MAXSIZE=100; // absolute max size of the array 
 double readings[MAXSIZE]; // input data array declaration
 double averages[MAXSIZE];  // averages array declaration

 string fileName1,fileName2; // create storage for two file names (input out output files)
 int noOfReadings; // actual number of readings 

 int carryon = 1; // initialise flag to continue calculations
 while (carryon)
 {  
 
  // enter name of file with input data
  cout << "Enter the name of the file with readings data: ";
  cin >> fileName1;
  cin.ignore(80, '\n');

  ifstream myDataFile; // declare an input stream from a file

  myDataFile.open(fileName1.c_str()); // open the input stream from the file
  
  // input data from the file
  
  myDataFile >> noOfReadings;

   // input actual readings from file
  for (int i=0; i< noOfReadings; i++)
  {
      myDataFile >> readings[i]; 
  }  
   
   // find averages 
   // initialise running total
  double total = 0;
  for (int i = 0; i < noOfReadings; i++)
  {
   total = total +  readings[i];
   averages[i] = total/(i+1);
  }
  
  // output the results
  cout << "Enter the name of the file where to store the averages (output) data: ";
  cin >>  fileName2;
  cin.ignore(80, '\n');

  ofstream myResultsFile; // declare an output sream to a file

  myResultsFile.open(fileName2.c_str()); //open the output stream to the file

  myResultsFile << noOfReadings << endl;

  // input actual readings from file
  for (int i=0; i< noOfReadings; i++)
  {
      myResultsFile << averages[i] << endl; 
  }  

  cout << endl << "Do you want to continue? (type 1 if yes; 0 if not) ";
  cin >> carryon;

 // close the files
  myDataFile.close(); 
  myResultsFile.close();

 } // end of while()

  cout << "End of Readings" << endl;
  return 0;
} // end main()