using System;

using static System.Console;

using System.Globalization;

class StudentGradeDemo

{

    static void Main()

    {

        try {ReportCard c1 = new ReportCard("Derek", 64, 76);}

        catch(ArgumentException e) {WriteLine($"{"c1"} {e.Message}");}

​

        try {ReportCard c2 = new ReportCard("Andre", 98, 90);}

        catch(ArgumentException e) {WriteLine($"{"c2"} {e.Message}");}

​

        try {ReportCard c3 = new ReportCard("Cooper", -25, 54);}

        catch(ArgumentException e) {WriteLine($"{"c3"} {e.Message}");}

​

        try {ReportCard c4 = new ReportCard("Jane", 120, 100);}

        catch(ArgumentException e) {WriteLine($"{"c4"} {e.Message}");}

    }

}

​

class ReportCard

{

    private string name;

    private int midterm;

    private int final;

    private double average;

    private char grade = 'F';

    private const int LOWCAP = 0;

    private const int HIGHCAP = 100;

    public int[] scores = {90, 80, 70, 60};

    public char[] grades = {'A', 'B', 'C', 'D'};

​

    public ReportCard(string student, int mid, int fin)

    {

        name = student;

        midterm = mid;

        final = fin;

​

        if(mid < LOWCAP || mid > HIGHCAP)

            throw(new ArgumentException());

        else if(fin < LOWCAP || fin > HIGHCAP)

            throw(new ArgumentException());

        average = (mid + fin) / 2;

​

        for(int x = scores.Length - 1; x >= 0; --x)

        {

            if(average > scores[x])

                grade = grades[x];

        }

​

        WriteLine($"{name}'s report card:");

        WriteLine($"   Midterm: {mid}  Final: {fin}");

        WriteLine($"   Average: {average}  Grade: {grade}");

    }

}