Elysian Shadows

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/**
/**
Marcel Girgis
11/24/10
1:57pm

PROGRAM ASSIGNMENT 3

Problem:
   Write a program to
     - Store test grades for all students in a CS class
     - Store data in a 2d array
     - 50 rows by 5 columns
Input Formatting:
    <# telling how many students>
    <grade1><space><grade2><space><grade3><space><grade4><space><grade 5>
Output:
    Via console
Additional Notes:
     - Adjust constants and recompile to change settings
**/

#include <fstream>
#include <iostream>
#include <iomanip>
#include <string>

const unsigned short int MAX_STUDENT_SIZE=50, PADDING_WIDTH=8;

using namespace std;

void   InitializeArray (int sudentRecords[][5]);
int    ReadStudentData (string file_name, int sudentRecords[][5]);
void   ShowStudentRecords(int sudentRecords [][5], int num);
void   ShowResults(int sudentRecords [][5], int num);

int main() {
    int sudentRecords[MAX_STUDENT_SIZE][5];
    int student_counter=0;

    InitializeArray(sudentRecords);

    //Prompt for file names
    string file_name;
    cout << "Enter the file name you would like to read data from: ";
    cin>>file_name;

    //read student data and fetch # read
    student_counter = ReadStudentData(file_name, sudentRecords);
    if(student_counter==-1) return -1; //signifies no students to be read, so exit.


    //echo records
    ShowStudentRecords(sudentRecords, student_counter);


    //do all requested processing and output
    cout << "\nProcessing data...\n"<<endl;
    ShowResults(sudentRecords, student_counter);

    cout << "\nProgram terminating. \n\nSo long, and thanks for the fish! =)"
         <<endl;
    system("pause");
}
/*
Simply initializes our all student data to default values.
This function is part of the program requirements. 

Pre:Takes a 2d array of size MAX_STUDENT_SIZE x 5
Post:  Array values have been set to zero
*/
void InitializeArray(int studetRecords[][5]) {
     for(int i=0;i<MAX_STUDENT_SIZE;i++) { 
          for(int j=0;j<5;j++) {
               studetRecords[i][j]=0;
          }

     }
}

/*
This function uses fstream to read from a file with argument 1's name
and populate our student's data based on the results.
      
pre: constant MAX_STUDENT_SIZE has been properly set
post: array student records now contain all student records.
*/
int ReadStudentData(string file_name, int studentRecords[][5]) {
    fstream file_in;
    int student_counter=0;
    //double total_salary=0;

    file_in.open(file_name.data());
    if(!file_in) {
         cout << "There was an error opening your file!"<<endl;
         return -1; //to signify an error
    }
    cout << "Successfully opened file."<<endl;

    //parse file
    while(!file_in.eof()) {
         //read amount first
         file_in>>student_counter;                 
         
         for(int i=0;i<student_counter&&i<MAX_STUDENT_SIZE;i++) {
              for(int j=0;j<5;j++) {
                   file_in>>studentRecords[i][j];
                   file_in.ignore(); 
                   //file_in.put('\n');
                   if(!file_in)return -1; //there aren't as many available 
                                          //grades as there should be.
              }
         }  
         //ignore the extra newline read after the ID
         file_in.ignore();
    }
    cout << "\nSuccessfully read " << student_counter <<
         " students."<<endl;
    file_in.close();

    return student_counter;
}

//pre: sudent records row size > num
//post: displays all requested results
void ShowResults(int sudentRecords [][5], int num) {
       cout  << setw(PADDING_WIDTH)<<"STUDENT #"
             << setw(PADDING_WIDTH)<<"Average"
             << setw(PADDING_WIDTH)<<"Grade\n";

      double average;
      int averageCounter[5]={0,0,0,0,0}; //index 1 corresponds to A, 2 corresponds to B, etc;
      double highestAverage=0;
      int highestAverageIndex=-1;
      
      for(int i=0;i<num;i++) {
           average=0;
           cout << endl;
           cout << setw(PADDING_WIDTH)<< i;
           
           //count each grade for the current student (j)
           for(int j=0;j<5;j++) {
                average+=sudentRecords[i][j];
           }
           average/=5; //5 grades
           
           //check if we have a new high average
           if(average > highestAverage) {
               highestAverage=average;
               highestAverageIndex=i;
           }
           
           
           cout << setw(PADDING_WIDTH)<<fixed << setprecision(1)<< average;

           //determine where they fall in average
           char letter =  ((average >= 90 && average<= 100 ) ? 'A' :
                          ( average >= 80 && average< 90   ) ? 'B' :
                          ( average >= 70 && average< 80   ) ? 'C' :
                          ( average >= 60 && average< 70   ) ? 'D' :
                          ( average <  60                  ) ? 'F' : 'X') ;
                          
          cout << setw(PADDING_WIDTH)<< letter;  
         
          //increment out counter
          averageCounter[letter-(letter !='F' ? 'A' : 'B' )]++; 
           
      }
      //display averages
      for(int i =0;i<5;i++) 
           cout << endl << "Number of " << char( (i==4? 5 : i)+'A')<<"'s: " << averageCounter[i];
       
      cout << endl << "Highest Average: Student # : " << highestAverageIndex << ", " << highestAverage;
      
          
}
//pre: array studentRecords contains grades for rows j to num
//post: displays to console the contents of student records
void ShowStudentRecords(int sudentRecords [][5], int num) {
      cout   << setw(PADDING_WIDTH)<<"STUDENT #"
             << setw(PADDING_WIDTH)<<"TEST1"
             << setw(PADDING_WIDTH)<<"TEST2"
             << setw(PADDING_WIDTH)<<"TEST3"
             << setw(PADDING_WIDTH)<<"TEST4"
             << setw(PADDING_WIDTH)<<"TEST5\n";
      for(int i=0;i<num;i++) {
           cout << endl;
           cout << setw(PADDING_WIDTH)<< i;
           for(int j=0;j<5;j++) {
               // cout  << setw(PADDING_WIDTH)<< i;
                cout  << setw(PADDING_WIDTH)<<sudentRecords[i][j];
           }
      }
} 

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char grade(char val)
{
	return val < 60 ? 'F' : 74-(val/10);
}

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          averageCounter[letter-(letter !='F' ? 'A' : 'B' )]++; 

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      for(int i =0;i<5;i++)
           cout << endl << "Number of " << char( (i==4? 5 : i)+'A')<<"'s: " << averageCounter[i];

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           char letter =  ((average >= 90 && average<= 100 ) ? 'A' :
                          ( average >= 80 && average< 90   ) ? 'B' :
                          ( average >= 70 && average< 80   ) ? 'C' :
                          ( average >= 60 && average< 70   ) ? 'D' :
                          ( average <  60                  ) ? 'F' : 'X') ;