c# assignments

Assignment5_1.cs

// https://repl.it/@Gumball12/Windows-programming-c-sharp-assignment-5-1

using System;
using System.Linq;

class Problem_1
{
  static void Main(string[] args)
  {
    // tool
    Func<string, string[]> splitBySpace = s => s.Split(' ');

    Console.WriteLine("이름, 학번, 학년 입력");

    // insert data
    string[] input = splitBySpace(Console.ReadLine());

    // create student instance
    Student student = new Student(input[0], input[1], Convert.ToInt32(input[2]));

    Console.WriteLine("\n중간, 기말 점수 입력");

    // insert data
    int[] input2 = splitBySpace(Console.ReadLine()).Select(s => Convert.ToInt32(s)).ToArray();

    // set values
    student.setMidScore(input2[0]);
    student.setFinalScore(input2[1]);

    // calculate summation
    student.calcSum();
    student.calcAvg();

    // print Student instance
    Console.WriteLine($"\n{student}");
  }
}

// student class
class Student
{
  /* instance variables */

  private string name;
  private string id;

  private int grade;
  private int midScore = 0;
  private int finalScore = 0;

  private double sum = 0;
  private double avg = 0;

  /* methods */

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

  // set mid score
  public void setMidScore (int midScore)
  {
    this.midScore = midScore;
  }

  // set final score
  public void setFinalScore (int finalScore)
  {
    this.finalScore = finalScore;
  }

  // calculate sum
  public double calcSum ()
  {
    return sum = Convert.ToDouble(midScore + finalScore);
  }

  // calculate average
  public double calcAvg ()
  {
    return avg = sum / 2;
  }

  // override ToString method
  public override string ToString ()
  {
    return $"이름: {name}, 학번: {id}, 학년: {grade}\n총점:  {sum}, 평균: {avg}";
  }
}

Assignment5_2.cs

// https://repl.it/@Gumball12/Windows-programming-c-sharp-assignment-5-2

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

class Problem_2
{
  static void Main(string[] args)
  {
    // tool
    Func<string, string[]> splitBySpace = s => s.Split(' ');

    Console.Write("학생의 명 수를 입력하세요: ");

    // insert data
    int studentCnt = Convert.ToInt32(Console.ReadLine());

    // student list
    List<Student> students = new List<Student>();

    for (int i = 0; i < studentCnt; i++) {
      Console.WriteLine("\n=\n\n이름, 학번, 학년 입력");

      // insert data
      string[] input = splitBySpace(Console.ReadLine());

      // create student instance
      Student student = new Student(input[0], input[1], Convert.ToInt32(input[2]));

      Console.WriteLine("\n중간, 기말 점수 입력");

      // insert data (convert to integer)
      int[] input2 = splitBySpace(Console.ReadLine()).Select(s => Convert.ToInt32(s)).ToArray();

      // set values
      student.MidScore = input2[0];
      student.FinalScore = input2[1];

      // calculate summation
      student.calcSum();
      student.calcAvg();

      // print Student instance
      Console.WriteLine($"\n{student}");

      students.Add(student);
    }

    // calculate
    double avgMidScore = students.Aggregate(0.00, (acc, student) => acc + Convert.ToDouble(student.MidScore)) / studentCnt;
    double avgFinalScore = students.Aggregate(0.00, (acc, student) => acc + Convert.ToDouble(student.FinalScore)) / studentCnt;

    Console.WriteLine($"\n\n==\n\n총 학생수는 {studentCnt} 명이며, 평균 중간 점수는 {avgMidScore.ToString("#.##")}점, 평균 기말 점수는 {avgFinalScore.ToString("#.##")}점 입니다.\n");
  }
}

// student class
class Student
{
  /* instance variables */

  private string name;
  private string id;

  private int grade;
  private int midScore = 0;
  private int finalScore = 0;

  private double sum = 0;
  private double avg = 0;

  /* methods */

  // default constructor
  public Student () {
    // init instance variables
    name = "";
    id = "";
    grade = 0;
  }

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

  // using properties
  public int MidScore {
    get { return midScore; }
    set { midScore = value; }
  }

  public int FinalScore {
    get { return finalScore; }
    set { finalScore = value; }
  }

  // calculate sum
  public double calcSum ()
  {
    return sum = Convert.ToDouble(midScore + finalScore);
  }

  // calculate average
  public double calcAvg ()
  {
    return avg = sum / 2;
  }

  // override ToString method
  public override string ToString ()
  {
    return $"이름: {name}, 학번: {id}, 학년: {grade}\n총점:  {sum}, 평균: {avg}";
  }

  // destructor
  ~Student () {
    Console.WriteLine("Destructor...");
  }
}

Assignment5_3.cs

// https://repl.it/@Gumball12/Windows-programming-c-sharp-assignment-5-3

using System;
using System.Linq;
using System.Text.RegularExpressions;

class Problem_3
{
  static void Main(string[] args)
  {
    Console.Write("수식을 입력하세요: ");

    // insert expression
    // separate operator and operands using 'Regex.Split()' method
    string[] input = Regex.Split(Console.ReadLine(), "[\\s]").Select(s => s.Trim()).ToArray();

    Console.WriteLine($">> 답 = {new Calc(input[0], input[2], input[1]).Result()}");
  }
}

class Calc {
  // store field
  private double result;

  public Calc (string a, string b, string operand) {
    int ia = Convert.ToInt32(a);
    int ib = Convert.ToInt32(b);

    // switch
    switch (operand) {
      case "+":
        result = ia + ib;
        break;

      case "-":
        result = ia - ib;
        break;

      case "*":
        result = ia * ib;
        break;
      
      case "/":
        result = ia / ib;
        break;
    }
  }

  public double Result () {
    return result;
  }
}

Assignment5_4.cs

// https://repl.it/@Gumball12/Windows-programming-c-sharp-assignment-5-4

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

class Problem_4
{
  static void Main(string[] args)
  {
    Parking parking = new Parking();
    string command;

    while (true) {
      Console.Write("\nenter number (0: car in, 1: car out): ");
      command = Console.ReadLine();

      if (!(command == "0" || command == "1")) {
        break;
      }

      parking.command(command);
    }
  }
}

class Parking {
  List<List<string>> db = new List<List<string>>();

  public void command (string command) {
    if (command == "0") {
      car_in();
    }

    if (command == "1") {
      car_out();
    }
  }

  private void car_in () {
    if (db.ToArray().Length > 9) {
      Console.WriteLine("db is full!");
      return;
    }

    Console.Write("enter car information (5885,k5,1): ");
    db.Add(Console.ReadLine().Split(',').OfType<string>().ToList()); // add car info
  }

  private void car_out () {
    List<string> car;
    string num, exit;

    Console.Write("enter car number: ");
    num = Console.ReadLine();

    Console.Write("enter exit time: ");
    exit = Console.ReadLine();

    if ((car = db.Find(data => data[0] == num)) == null) {
      Console.WriteLine("fail to find the car.. :(");
      return;
    }

    Console.WriteLine($"car has benn out. parking fee = {(Convert.ToInt32(exit) - Convert.ToInt32(car[2])) * 3}$");

    db.Remove(car);
  }
}

Assignment5_5.cs

using System;

class Problem_5 {
  static void Main(string[] args) {
    Stack stack = new Stack();

    stack.push("a");
    stack.push("b");
    stack.push("c");

    Console.WriteLine(stack.pop()); // c

    stack.push("d");

    Console.WriteLine(stack.pop()); // d
    Console.WriteLine(stack.pop()); // b
    Console.WriteLine(stack.pop()); // a

    Console.WriteLine(stack.pop()); // stack underflow
    Console.WriteLine(stack.peek()); // stack underflow

    Console.WriteLine(stack.isEmpty()); // true

    Console.WriteLine(stack.size()); // 0
  }
}

class Stack {
  /* instance variables */

  static readonly int MAX = 100;

  private int top;
  private object[] data = new object[MAX];

  /* methods */

  // constructor
  public Stack () {
    top = -1; // init top
  }

  // push object
  public bool push (object value) {
    if (MAX <= top) {
      Console.WriteLine("Stack overflow :(");
    } else {
      data[++top] = value;
    }

    return MAX <= top;
  }

  // pop object with remove element
  public object pop () {
    if (top == -1) {
      Console.WriteLine("Stack underflow :(");
      return null;
    } else {
      return data[top--];
    }
  }

  // tests if this stack is empty?
  public bool isEmpty () {
    return top == -1;
  }

  // get object without remove element
  public object peek () {
    if (top == -1) {
      Console.WriteLine("Stack underflow :(");
      return null;
    } else {
      return data[top];
    }
  }

  // get size
  public int size () {
    return top + 1;
  }
}