/*
 * 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>
#include <fstream>
#include <string>
using namespace std;

void openInput( string & infile, ifstream & fin );
void processFile( istream & fin );

int main( )
{
    string 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( string & infile, ifstream & fin )
{
    for( ; ; )                              // Loop until a break
    {
        cout << "Enter the input file name: ";
        cin >> infile;

        fin.open( infile.c_str( ) );
        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;
    string name;
    string 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;
}