class를 이용한 간단 예제 2개

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;

namespace ConsoleApp1
{
    class Man
    {
        public string name;
        public int age;
        public Man(string name_in = "", int age_in = 0)
        {
            name = name_in;
            age = age_in;
        }
        public void AddAge(int addValue)
        {
            age += addValue;
        }
        public void MinusAge(int minusValue)
        {
            if (age - minusValue > 0)
                age -= minusValue;
            else
                Console.WriteLine("유효하지 않은 입력 : age가 -가 됩니다.");
        }
        public void SetName(string name_in)
        {
            name = name_in;
        }
        public void SetAge(int age_in)
        {
            age = age_in;
        }
        public void print()
        {
            Console.WriteLine("이름 : {0}, 나이 : {1}", name, age);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Man maaan = new Man();
            maaan.SetName("건우");
            maaan.SetAge(26);
            maaan.print();
        }
    }
}

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;

namespace ConsoleApp1
{
    class Student
    {
        private string name;
        private int number;
        public Student()
        { }
        public Student(int number_in, string name_in)
        {
            number = number_in;
            name = name_in;
        }

        public void AppendStudent(int number_in, string name_in)
        {
            number = number_in;
            name = name_in;
        }
        public void print()
        {
            Console.WriteLine("{0}번 : {1}", number, name);
        }
    }
    class Info
    {
        List<Student> students = new List<Student>();

        public void AppendStudent(Student student)
        {
            students.Add(student);
        }
        public void print()
        {
            foreach (var student in students)
                student.print();
        }
    }
    //enum names { 건우, 민수, 철수, 영희, 자두};
    class Program
    {
        static void Main(string[] args)
        {
            Info info = new Info();
            info.AppendStudent(new Student(1, "건우"));
            info.AppendStudent(new Student(2, "민수"));
            info.AppendStudent(new Student(3, "철수"));
            info.AppendStudent(new Student(4, "영희"));
            info.AppendStudent(new Student(5, "자두"));
            info.print();
            Console.WriteLine();
            
            Student[] students = new Student[5];
            students[0] = new Student(1, "건우");
            students[1] = new Student(2, "민수");
            students[2] = new Student(3, "철수");
            students[3] = new Student(4, "영희");
            students[4] = new Student(5, "자두");

            for (int i = 0; i < 5; i++)
                students[i].print();

            Console.Write("출력하고 싶은 출석번호 쓰슈 : ");
            int number = int.Parse(Console.ReadLine());

            if ((number >= 1 && number <= 5) == false)
                Console.WriteLine("유효하지 않은 입력입니다");
            else
                students[number - 1].print();
        }
    }
}