// Program will student and grade data from a file, and fill two string arrays
// and one two dimensional float array.  The array will be processed to produce
// the course average for each student and the test average for each test.
// Input: Text file will student and grade data 
// Output: Table display with student name, test grades, class average and test
// average.


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

typedef float grade_array[50];
typedef float table_array[50][4];
typedef float test_array[4];
typedef string string_array[50];

void process_file(ifstream&, string_array, string_array, table_array, int&);
void int_grades(table_array, int);
void row_avg(table_array, grade_array, int);
void col_avg(table_array, test_array, int);
void display_results(string_array, string_array, table_array, grade_array, test_array, int);


int main()
{
    
    ifstream textin;
    string_array f_name;
    string_array l_name;
	table_array grades;
	grade_array course_avg;
    test_array test_avg;
	
	int rowcount = 0;
                
    textin.open ("grades.txt");
      
    if (!textin)
    {
      cout << endl << endl;
      cout << "File was not found!" << endl;
      cout << "Please check for existance of the file and run the program again." << endl;
      cout << endl;
      system ("Pause");
    } 
    else
    {
      int_grades(grades,rowcount);
      process_file(textin,f_name,l_name,grades,rowcount);
      row_avg(grades,course_avg,rowcount);
      col_avg(grades,test_avg,rowcount);
      display_results(f_name,l_name,grades,course_avg,test_avg,rowcount);
    }
      
    textin.close();
    return 0;	

}


//******************************************************************************
void display_results(string_array f_name,
                     string_array l_name,
                     table_array grades,
                     grade_array course_avg,
                     test_array test_avg,
                     int rowcount)
{
     int row;
     int col;

     cout << endl;
     cout << fixed << setprecision(2);
     cout << setw(20) << left << "Student Name";
     cout << setw(10) << right << "Test 1";
     cout << setw(10) << right << "Test 2";
     cout << setw(10) << right << "Test 3";
     cout << setw(10) << right << "Test 4";
     cout << setw(15) << right << "Course Avg";
     cout << endl;
     for (row = 0; row < rowcount; row++)
     {
       cout << setw(10) << left << f_name[row] << setw(10) << left << l_name[row];
       for (col = 0; col < 4; col++)
         cout << setw(10) << right << grades[row][col];
       cout << setw(15) << right << course_avg[row];  
       cout << endl;  
     }
     cout << endl;
     cout << setw(20) << left << "Test Averages";
     for (col = 0; col < 4; col++)
     {
       cout << setw(10) << right << test_avg[col];
     }
     cout << endl; 
     cout << endl;
     system("Pause");
     
} 

//******************************************************************************
void int_grades(table_array grades, int rowcount)
{
     
     int row;
     int col;
     
     for (row = 0; row < 50; row++)
       for (col = 0; col < 4; col++)
         grades[row][col] = 0.0;
         
}


//******************************************************************************
void col_avg(table_array grades, test_array test_avg, int rowcount)

{
    int row;
    int col;
    float total; 

	for (col = 0; col < 4; col++)
    {
      total = 0.0;  
      for (row = 0; row < rowcount; row++)
        total = total + grades[row][col];
      test_avg[col] = total / row;
    }
   
}


//******************************************************************************
void row_avg(table_array grades, grade_array course_avg, int rowcount)

{
    int row;
    int col;
    float total; 

	for (row = 0; row < rowcount; row++)
    {
      total = 0.0;  
      for (col = 0; col < 4; col++)
        total = total + grades[row][col];
      course_avg[row] = total / 4;
    }
   
}


//******************************************************************************
void process_file(ifstream& textin,
                  string_array f_name,
                  string_array l_name,
                  table_array grades,
                  int& rowcount)

{
    int col; 

	while (!textin.eof())
	{
       textin >> f_name[rowcount] >> l_name[rowcount];
       for(col = 0; col < 4; col++)
         textin >> grades[rowcount][col];      
	   rowcount++;      
    }
   
}