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

void readfile(string,char[], int,int,int[]);
void convert(string);
void output(string,ifstream&,char[],double,double,double,int, int,int,int[],char,int&);
void calcstats(int,double, double,double,int, int,int,int[],char,int&);

int main()
{
  string fname;
        int nums[60];
        int size = 0;
        int sum=0;
        int pmax=0;
        int pmin=0;
        double avg=0;
        char letter;
        char studname[60];
        ifstream outname;
        double variation=0;
        double stddev=0;
        string name;
        int sizep, sizec;
        int comps[60];
        int len;
        int count[0];
        int count2;
        int letterc;
 cout << " Enter file name for input? "<< endl;
        cin >> fname;
        cout << " Enter file name for output?" << endl;
        cin >> name;
        readfile(fname,studname,count2,len,nums); // reads the file
        calcstats(len,variation,stddev,avg,sum,pmax,pmin,count,letter,size); // main numbers
        output(fname,outname,studname, variation,stddev,avg,len,pmax,pmin, nums,letter,letterc);

        return 0;
}

void  calcstats(int len,double variation, double stddev,double avg, int sum, int pmax, int pmin,int count[], char lettergrade,int& j)

{
  pmin=0;
avg=0;
pmax = 0;
for (int  i = 0; i < len; i++)
  {
    if (i < pmin)
      pmin = i;
    if (pmax=i <  i)
      pmax = i;

    for ( j=1; j <=count[i]; j++)
if ( i  >= 90 &&  i <= 100 )

    lettergrade = 'A';


 else
   if  (i  >= 80 &&  i <= 89 )


       lettergrade = 'B';


   else
     if  ( i >= 70 &&  i <= 79 )

         lettergrade= 'C';


    if  ( i >= 60 &&  i <= 69 )

      lettergrade='D';

    else
      if (i <= 60)
          lettergrade='F';


  }

    avg = (double)sum/(double)len;
    sum = 0;
    for (int k = 0; k < len; k++)
      sum += (k - avg)*(k - avg);
           variation = sum;
           stddev = sqrt(variation);


}


void convert(char firstname[])
{
  for (int j=0;j<60; j++)

    {
      firstname[0]=toupper(firstname[0]);
      firstname[j]=tolower(firstname [j]);
    }
void readfile(string fname,char name[], int count,int len, int numz[])
{
        ifstream in;
        count=0;
        name[60];
        len = 0;
        int val;

        in.open(fname.c_str());

        in >> val;
        in >> name[len];
        numz[len]=val;
        ++len;

        while(!in.eof())
        {
          in >> val>> name[len];
                numz[len] = val;
                ++len;
                count++;

        }

        in.close();
}






void output(string fname,ifstream& name,char sname[], double variation,double stddev ,double avg,int max,int min, int len, int nums[], char lettergrade,int& letter) // output function to display everything from the readfile function
{
        ofstream out;
        string studname;
        out.open(fname.c_str());

        out << "Thomas Castro section#1001 assignment11\n";
        out << " " << endl;
        out<< " name of inputfile" << name << endl;
        for (int i = 0; i < len; ++i)
          out << nums[i] << "\t"<< endl;
        int lettercount=nums[letter];
        convert(sname);
        out << "the high score of" << max << "was earned by"<< sname <<  endl;
        out << "The low score of  "<<min << " was earned by" << sname <<  endl;
        out << "average: " << avg << endl;
        out << "variation: " << variation << endl;
        out << "stddev: " << stddev << endl;

        out << "Grade Distribution" << endl;
        out << " A" << " | " << lettercount  << endl;
        out << " B" <<" | " <<lettercount  << endl;
        out << " C" <<" | " << lettercount << endl;
        out << " D" <<" | " <<lettercount  << endl;
        out << " F" << " | " <<lettercount  << endl;

out.close();
}