Zad7

#include "pch.h"
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <stdlib.h>
#include <sstream>

using namespace std;

const int n = 3, precision = 2, width = 20;

int main()

{
    // Tworzę rekord
    struct Student
    {
        string name;
        double grade = 0;
    };

    ifstream file;
    string fileName;

    cout << "Enter file name or path: ";
    cin >> fileName;

    // Otwieram plik i sprawdzam czy dany plik istnieje
    file.open(fileName, ios::in | ios::out);

    if (!file.good())
    {
        cout << "Error! File not found. Please use correct file name or path." << endl;
        return 404;
    }

    cout << endl;

    Student A[n][n];
    string line;

    // Wypełniam tablicę A danymi z pliku
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if (getline(file, line)) {

                string name;
                double grade = 0;

                stringstream stream(line);
                stream >> name;
                stream >> grade;

                Student newStudent;

                newStudent.name = name;
                newStudent.grade = grade;

                A[i][j] = newStudent;
            }
        }
    }

    // Drukuje tablice
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cout << setw(width) << setprecision(precision) << fixed << A[i][j].name << " - " << A[i][j].grade;
        }

        cout << endl;
    }

    cout << endl;

    int gradeCounter = 0;
    double sumOfGrades = 0;

    // Sprawdzam liczby >= 3 dla imion kończących się na 'a' lub 'k' pod główną przekątną tablicy
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if (i > j)
            {
                Student currentStudent;
                currentStudent = A[i][j];
                int lastLetter = currentStudent.name.length() - 1;

                if ((currentStudent.grade >= 3.0) && (currentStudent.name[lastLetter] == 'a' || currentStudent.name[lastLetter] == 'k'))
                {
                    gradeCounter++;
                    sumOfGrades += currentStudent.grade;
                }
            }
        }
    }

    // Obliczam średnią ocen, które spełniły warunki. Jeżeli nie było takich ocen, średnia wynosi 0
    double averageFromGradesThatPassedTheTest = 0;

    averageFromGradesThatPassedTheTest = gradeCounter == 0 ? 0 : sumOfGrades / (double)gradeCounter;

    cout << "Average from grades that are above 3.0, for students that name ends with 'a' or 'k' and were placed under main diagonal: " << averageFromGradesThatPassedTheTest;
    cout << endl;

    // Sprawdzam ile jest kolumn, w których średnia ocen przekracza wartość zmiennej averageFromGradesThatPassedTheTest
    int columnCounter = 0;
    double columnGradeSum = 0;
    double averageInColumn = 0;

    for (int j = 0; j < n; j++)
    {
        for (int i = 0; i < n; i++)
        {
            columnGradeSum += A[i][j].grade;
        }

        if (columnGradeSum / (double)n > averageFromGradesThatPassedTheTest) {
            columnCounter++;
        }
    }

    cout << "Number of columns where grades average is bigger than average printed above: " << columnCounter << endl;

    file.close();

    return 0;
}