/*
 * Read a file that contains lines of the form
 * Name salary
 * Output the number of lines read the average salary,
 * and the highest-salaried person.
 * This program is deliberately missing comments.
 */

#include <iostream.h>
#include <fstream.h>
#include "apstring.h"

void OpenInput( apstring & infile, ifstream & fin );
void ProcessFile( istream & fin );

int main( )
{
    apstring infile;  // Input file name
    ifstream fin;     // Input file stream

    OpenInput( infile, fin );
    ProcessFile( fin );

    return 0;
}


/**
 * Prompt the user for an input file and open it.
 * (Differs from the day class version in that it informs
 *   the user of the name of the file that was opened.
 *   This is used in sample #2.)
 * Pre: None.
 * Post: fin is open and ready for reading.
 *       infile is the name of the file that was opened.
 */
void OpenInput( apstring & infile, ifstream & fin )
{
    for( ; ; )                              // Loop until a break
    {
        cout << "Enter the input file name: ";
        cin >> infile;

        fin.open( infile.c_str( ), ios::in | ios::nocreate );
        if( !fin )                          // !fin true if open fails
        {
           cout << "Bad file." << endl;     // Print message
           fin.clear( );                    // Reset the error state
        }
        else
           break;
    }
}


/**
 * Process the file. Print the number of people read,
 * the average salary, and the person with the high salary.
 * pre: fin is open and ready for reading.
 *      lines contain a name and salary.
 * post: the required info is output, and fin has been read completely.
 */
void ProcessFile( istream & fin )
{
    int ItemsRead = 0;
    double Sum = 0.0;
    apstring Name;
    apstring RichBoy;
    double Salary;
    double MaxSalary = 0.0;

    while( fin >> Name >> Salary )
    {
        ItemsRead++;
        Sum += Salary;
        if( Salary > MaxSalary )
        {
            MaxSalary = Salary;
            RichBoy = Name;
        }
    }

    cout << "Read " << ItemsRead << " records." << endl;
    cout << "The average salary is " << (Sum / ItemsRead) << endl;
    cout << "The highest paid person is " << RichBoy << "; ";
    cout << "(s)he makes " <<  MaxSalary << endl;
}