// basic file operations
#include <iostream>
#include <fstream>
using namespace std;
int read_file_in_array(double exam[100][3]);
double calculate_total(double exam1[], double exam2[], double exam3[]); // function that calcualates grades to see how many 90,80,70,60
//void display_totals();
double exam[100][3];
int main()
{
    double go,go2,go3;
    double exam[100][3],exam1[100],exam2[100],exam3[100];
    go=read_file_in_array(exam);
    go2=calculate_total(exam1,exam2,exam3);
    //go3=display_totals();
    cout << go,go2,go3;
    return 0;
}
/*
int display_totals()
{

    int grade_total;
    grade_total=calculate_total(exam1,exam2,exam3);
    return 0;
}   */
double calculate_total(double exam1[],double exam2[],double exam3[])
{
    int calc_tot,above90=0, above80=0, above70=0, above60=0,i,j, fail=0;
    double exam[100][3];
    calc_tot=read_file_in_array(exam);
    for(i=0;i<100;i++)
        {
        for (j=0; j<3; j++)
            {
            exam1[i]=exam[100][0];
            exam2[i]=exam[100][1];
            exam3[i]=exam[100][2];
            if(exam[i][j] <=90 && exam[i][j] >=100)
                {
                above90++;
                    {
                    if(exam[i][j] <=80 && exam[i][j] >=89)
                        {
                        above80++;
                            {
                            if(exam[i][j] <=70 && exam[i][j] >=79)
                                {
                                above70++;
                                    {
                                    if(exam[i][j] <=60 && exam[i][j] >=69)
                                        {
                                        above60++;
                                            {
                                            if(exam[i][j] >=59)
                                                {
                                                fail++;
                                            }
                                            }
                                    }
                                    }
                            }
                            }
                    }
                    }
            }
        }
    }
    return 0;
}

int read_file_in_array(double exam[100][3])
{
    ifstream infile;  
    int exam1[100];
    int exam2[100];
    int exam3[100];
  infile.open("grades.txt");// file containing numbers in 3 columns
    if(infile.fail()) // checks to see if file opended
        {
        cout << "error" << endl;
        }
    int num, i=0,j=0;
    while(!infile.eof()) // reads file to end of line
      {
          for(i=0;i<100;i++) // array numbers less than 100
          {
            for(j=0;j<3;j++) // while reading get 1st array or element
            infile >> exam[i][j];
            infile >> exam[i][j];
            infile >> exam[i][j];
            cout << exam[i][j] << endl;
                {
                    if (! (infile >> exam[i][j]) )
                    cout << exam[i][j] << endl;
                }
          exam[i][j]=exam1[i];
          exam[i][j]=exam2[i];
          exam[i][j]=exam3[i];
          }     
    infile.close();
  }
return 0;
}