c# assignment - week7

Problem_1.cs

// import modules
using System;
using System.Collections.Generic;
using System.Linq;

class Problem_1
{
    static void Main(string[] args)
    {
        // define Student list
        List<Student> students = new List<Student>();

        // insert student counts
        Console.Write("학생의 수를 입력하시오: ");

        for(int i = 0, j = Convert.ToInt32(Console.ReadLine()); i < j; i++)
        {
            Console.Write("학생의 정보를 입력하시오 (학번 이름 성별 생년월일): ");
            string[] inputs = Console.ReadLine().Split(" ");

            students.Add(new Student(inputs)); // create Student instance
        }

        // print students
        Console.WriteLine("\n");
        students.ForEach(Console.WriteLine);

        Console.Write("\n\n 수정할 학생의 학번을 입력하시오: ");
        string id = Console.ReadLine();

        // find student
        foreach (Student s in students)
        {
            if (s.Id == id)
            {
                // insert new data
                Console.Write($"수정 전 정보:\n{s}\n\n학생의 이름을 입력하시오: ");
                s.Name = Console.ReadLine();

                Console.Write("\n학생의 성별을 입력하시오: ");
                s.Gender = Console.ReadLine();

                Console.Write("\n 학생의 생년월일을 입력하시오: ");
                s.Birth = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine($"수정 후 정보:\n{s}");

                break; // break foreach statement
            }
        }
    }
}

class Student
{
    // instance variables (private)
    private string name;
    private string id; // 00000000
    private string gender;
    private int birth; // yymmdd

    // default constructor
    public Student ()
    {
        // init vatiables
        name = null;
        id = null;
        gender = null;
        birth = 0;
    }

    // constructor
    public Student (string name, string id, string gender, int birth)
    {
        this.name = name;
        this.id = id;
        this.gender = gender;
        this.birth = birth;
    }

    // constructor (using array argument)
    public Student (string[] args)
    {
        this.id = args[0];
        this.name = args[1];
        this.gender = args[2];
        this.birth = Convert.ToInt32(args[3]);
    }

    // properties
    public string Name
    {
        get { return name; }
        set { name = value; }
    }

    public string Id
    {
        get { return id; }
        set { id = value; }
    }

    public string Gender
    {
        get { return gender; }
        set { gender = value; }
    }

    public int Birth
    {
        get { return birth; }
        set { birth = value; }
    }

    // print method
    public void print()
    {
        Console.WriteLine(ToString());
    }

    // override ToString() method
    public override string ToString()
    {
        return $"{id}\t{name}\t{gender}\t{birth}";
    }
}

Problem_2.cs

using System;
using System.Collections.Generic;
using System.Linq;

class Problem_2
{
    static void Main (string[] args)
    {
        int i = 50;

        // print numbers
        Console.WriteLine("Odd numbers... to " + i);
        new Odd()[i].ForEach(Console.WriteLine);

        Console.WriteLine("\nEven numbers... to " + i);
        new Even()[i].ForEach(Console.WriteLine);
        
        Console.WriteLine("\nPrime numbers... to " + i);
        new Prime()[i].ForEach(Console.WriteLine);
    }
}

// parent class
class Number
{
    // define result list
    protected List<int> result = new List<int>();

    // tool
    protected int safeNumber (int n)
    {
        if (n > 99)
        {
            n = 99;
        }

        if (n < 0)
        {
            n = 0;
        }

        return n;
    }
}

// Odd number class
class Odd: Number
{
    // using indexer
    public List<int> this[int n]
    {
        get
        {
            n = safeNumber(n);

            // calcaulte odd numbers
            for (int i = 1; i < n; i += 2)
            {
                result.Add(i);
            }

            return result;
        }
    }
}

// Even number class
class Even: Number
{
    // using indexer
    public List<int> this[int n]
    {
        get
        {
            n = safeNumber(n);

            // calculate even numbers
            for (int i = 0; i < n; i += 2)
            {
                result.Add(i);
            }

            return result;
        }
    }
}

// Prime number class
class Prime: Number
{
    public List<int> this[int n]
    {
        get
        {
            n = safeNumber(n);
            
            result.Add(2);
            result.Add(3);

            // calculate prime numbers
            for (int i = 4; i < n; i++)
            {
                bool isPrime = true;
                
                for (int j = 2; j <= i / 2; j++)
                {
                    if (i % j == 0)
                    {
                        isPrime = false;
                        break;
                    }
                }
                
                if (isPrime == true)
                {
                    result.Add(i);
                }
            }
            
            return result;
        }
    }
}

Problem_3.cs

using System;
using System.Linq;

class Problem_3
{
    static void Main(string[] args)
    {
        // Insert size and Create instances
        Console.Write("삼각형의 크기를 입력하시오: ");
        Triangle t = new Triangle(Convert.ToInt32(Console.ReadLine()));

        Console.Write("사각형의 가로, 세로 크기를 입력하시오: ");
        int[] inputs = Console.ReadLine().Split(',').Select(s => Convert.ToInt32(s.Trim())).ToArray();
        Rectangle r = new Rectangle(inputs[0], inputs[1]);

        // draw
        t.Draw();

        Console.WriteLine("\n");

        r.Draw();
    }
}

abstract class Shape
{
    // instance variable
    private int width = 0;
    private int height = 0;
    
    // constructor
    public Shape (int size)
    {
        this.width = size;
        this.height = size;
    }

    public Shape (int width, int height)
    {
        this.width = width;
        this.height = height;

    }

    // properties
    protected int Size
    {
        get { return (width + height) / 2; }
        set {
            width = value;
            height = value;
        }
    }

    protected int Width
    {
        get { return width; }
        set { width = value; }
    }

    protected int Height
    {
        get { return height; }
        set { height = value; }
    }

    // declaration abstact Draw() method
    public abstract void Draw();

    // tools
    public static Func<char, int, string> getChar = (c, length) => new string(c, length);
    public static Func<int, string> getSpace = length => getChar(' ', length);
    public static Func<int, string> getAsterisk = length => getChar('*', length);
}

class Triangle: Shape
{
    // constructor
    public Triangle (int size): base(size) // base: parent constructor
    {
        // nothing
    }

    // override Draw() method
    public override void Draw ()
    {
        for (int i = 0; i < Size; i++)
        {
            Console.WriteLine($"{Shape.getSpace(Size - i)}{Shape.getAsterisk(1 + i * 2)}");
        }
    }
}

class Rectangle: Shape
{
    // constructor
    public Rectangle (int width, int height): base(width, height)
    {
        // nothing
    }

    // override Draw() method
    public override void Draw()
    {
        for (int i = 0; i < Height; i++)
        {
            Console.WriteLine(Shape.getAsterisk(Width));
        }
    }
}

Problem_4.cs

using System;

class Problem_4
{
    static void Main(string[] args)
    {
        Console.WriteLine($"사각형 {new Rectangle()}");
        Console.WriteLine($"사각형 {new Rectangle(5, 7)}");

        Console.WriteLine($"원 {new Circle()}");
        Console.WriteLine($"원 {new Circle(5)}");

        Console.WriteLine($"삼각형 {new Triangle()}");
        Console.WriteLine($"삼각형 {new Triangle(5, 7)}");
    }
}

abstract class Shape
{
    // instance variables
    protected double width, length, radius, a, b, c;

    public abstract double area();
    public abstract double perimeter();

    public override string ToString()
    {
        return $"넓이: {area()}, 둘레: {perimeter()}";
    }
}

class Rectangle: Shape
{
    // default constructor
    public Rectangle ()
    {
        width = 1;
        length = 1;
    }

    // constructor
    public Rectangle (int width, int length)
    {
        this.width = width;
        this.length = length;
    }

    public override double area()
    {
        return width * length;
    }

    public override double perimeter()
    {
        return width * 2 + length * 2;
    }
}

class Circle: Shape
{
    // default constructor
    public Circle ()
    {
        radius = 1;
    }

    // constructor
    public Circle (int radius)
    {
        this.radius = radius;
    }

    public override double area()
    {
        return Math.PI * radius * radius;
    }

    public override double perimeter()
    {
        return 2 * Math.PI * radius;
    }
}

class Triangle: Shape
{
    // default constructor
    public Triangle ()
    {
        this.width = 1;
        this.length = 1;
    }

    // constructor
    public Triangle (int width, int length)
    {
        this.width = width;
        this.length = length;
    }

    public override double area()
    {
        return width * length / 2;
    }

    public override double perimeter()
    {
        return width + Math.Sqrt(Math.Pow(width / 2, 2) + Math.Pow(length, 2)) * 2;
    }
}