//
// scores.cpp
// CSC 215
// John Rogers
//
// This program reads a file where each line contains
// a student's last name and a test score.  It prints
// out the student's name and the score.
// At the end of the report, it prints out the number
// of students processed and the average of all the
// test scores.
//

#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>

void openFile(ifstream& studentfile);
void closeFile(ifstream& studentfile);
void printLine(char *lastname, int score);
void printSummary(int studentcount, int totalscore);

int main()
{
  char lastname[16]; 
  int score, totalscore = 0, studentcount = 0;
  ifstream studentfile;

  openFile(studentfile);
  while (studentfile >> lastname >> score) {
    studentcount++;
    totalscore += score;
    printLine(lastname, score);
  }
  closeFile(studentfile);
  printSummary(studentcount, totalscore);
  return 0;
}

  
// 
// Connect the input file stream object studentfile
// to the file whose name is given by the user.  
// Exit the program if the open failed more than 3 times.
//
void openFile(ifstream& studentfile)
{
  char studentfileName[51]; // Assume that the name is 50 chars or less.
  int errorcount = 0;

  do {
    cout << "Enter the pathname of the file containing the " 
         << "student data: ";
    cin >> studentfileName;
    studentfile.open(studentfileName);
    if (studentfile.fail()) {
      cout << "Unable to open the file " << studentfileName << endl;
      errorcount++;
      if (errorcount > 3) {
        exit(1);
      }
    }
  } while (studentfile.fail());
  return;
}
 

// 
// Print a report line containing the last name and
// the scores.
//
void printLine(char *lastname, int score)
{
  cout.setf(ios::left);
  cout.width(15);
  cout << lastname << " ";  

  cout.setf(ios::right);
  cout.width(3);
  cout << score << endl;

  return;
}

// 
// Print the summary at the end of the report.
//
void printSummary(int studentcount, int totalscore)
{ 

  cout << endl << endl; 
  cout << "Total number of students: "
       << studentcount << endl;

  cout.precision(2);
  cout.setf(ios::fixed);
  cout.setf(ios::showpoint);
  cout << "Combined average: "
       << double(totalscore) / studentcount
       << endl << endl;

  return;
}

//
// Close the student file.
//
void closeFile(ifstream& studentfile)
{
  studentfile.close();
  return;
}