// This program reads in student names plus 5 exam scores from a file.
// It loads this data into an array of structures, computes final grades,
// and then prints out the information.

#include <string.h>
#include <iomanip.h>
#include <fstream.h>

#define N_SCORES 5

struct student {
    char last_name[50];
    int score[5];
    char final_grade;
};

char assign_grade(double mean_score);
bool read_student_data(ifstream &score_file, student &s);
double compute_mean(int students_scores[]);

int main()
{
    student cs1300[200];  // array of students in cs1300
    student perfect = {"PERFECT",{100,100,100,100,100},'A'};
			  // "perfect" is a student with perfect scores
    int cur, i, j;
    ifstream score_file;
 
    // read student name and scores from file
 
    score_file.open("scores");
 
    for (cur=0; read_student_data(score_file,cs1300[cur]); ++cur)
	
        // determine letter grade
        cs1300[cur].final_grade = assign_grade(compute_mean(cs1300[cur].score));

    // create a final student with a perfect score
    // (note:  "i" indexes the cs1300 array past the last student)
    
    cs1300[cur] = perfect;
 
    // print out students and scores and final grade
    
    for (i=0;i<=cur; ++i) 
    {
	cout << "student " << i << setw(20) << cs1300[i].last_name
	     << "   scores: ";
	for (j=0;j<N_SCORES;++j)
	    cout << setw(4) << cs1300[i].score[j];
        cout << "  final grade " << cs1300[i].final_grade << endl;
    }
}


///////////////////////////// read_student_data ////////////////////////////////

bool read_student_data(ifstream &score_file, student &s)
{
    int i;

    score_file >> s.last_name;
    if (score_file.eof())
	return false;

    for (i=0;i<N_SCORES;++i)
	score_file >> s.score[i];

    return true;
}
 

///////////////////////////// compute_mean /////////////////////////////////////

double compute_mean(int students_scores[])
{
   int i, total=0;

   for (i=0;i<N_SCORES;++i)
      total += students_scores[i];

   return double(total)/N_SCORES;     // return mean score
}


///////////////////////////// assign_grade /////////////////////////////////////

char assign_grade(double mean_score)
{

   if (mean_score > 90)
      return 'A';
   else if (mean_score > 80)
      return 'B';
   else if (mean_score > 70)
      return 'C';
   else if (mean_score > 60)
      return 'D';
   else 
      return 'F';
}