//////////////////////////////////////////////////////////////////////////
//                                name.c                                //
//                                                                      //
// Purpose                                                              //
// =======                                                              //
// The program obtains a finite set of readings from the user           //
// and calculates the largest and smallest reading.                     //
// The readings are temporarily stored in an array.                     // 
// A C++ built-in array is used                                         //
//                                                                      //
// Author            Creation Date                                      //
// ======            =============                                      //
// AY                16 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 largest (double) and smallest reading (double)     //
// and their corresponding reading numbers                              //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

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


int main()
{
  
 const int MAXSIZE=100; // absolute max size of the array 	
 double readings[MAXSIZE]; // array declaration
 double maxRead;
 double minRead;
 int maxNum;
 int minNum;

 string fileName; // create a filename storage for a string of characters 
 
 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 >> fileName;

  cout << fileName << endl;

  ifstream myDataFile;
  myDataFile.open(fileName.c_str());
  
  // input data from the file
  
  myDataFile >> noOfReadings;

   // input actual readings from file
  for (int i=0; i< noOfReadings; i++)
  {
      myDataFile >> readings[i]; 
  }  
   
   // find max and min
   //initialise current max and min
  maxRead = readings[0];
  minRead = readings[0]; 
  maxNum = 0;
  minNum = 0;
  
  for (int i = 1; i < noOfReadings; i++)
  {
  
     if (maxRead < readings[i])
     {
        maxRead = readings[i];
        maxNum = i;
     }
     
     if (minRead > readings[i])
     {
         minRead = readings[i];
         minNum = i;
     }    
   
  }
  
  // output the results
   
  cout << "The largest reading was " << maxRead << " - it was " <<
          " reading no. " << maxNum+1 << endl;
  cout << "The smallest reading was " << minRead << " - it was " <<
          " reading no. " << minNum+1 << endl;         

  cout << endl << "Do you want to continue? (type 1 if yes; 0 if not) ";
  cin >> carryon;
 }
  cout << "End of Readings" << endl;
  return 0;
} // end main()