c#:jaggedArray(가변 길이 배열)

using System;
namespace Hello_World
{
	public class EmptyClass
	{
            static void Main(string[] args)
			{
                //declare jaggedAraay
                int[][] jaggedArray = new int[3][];

                jaggedArray[0] = new int[5];
                jaggedArray[1] = new int[3];
                jaggedArray[2] = new int[2];

                jaggedArray[0] = new int[] { 2, 3, 5, 7, 11 };
                jaggedArray[1] = new int[] { 1, 2, 3 };
                jaggedArray[2] = new int[] { 13, 21 };

                //alternative way
                int[][] jaggedArray2 = new int[][]
                {
                new int[]{ 2, 3, 5, 7, 11 },
                new int[] { 1, 2, 3 }
                };
                Console.WriteLine("The Value in the middle of the first entry is {0}", jaggedArray2[0][2]);
            for (int i = 0; i < jaggedArray2.Length; i++)
            {
                Console.WriteLine("Element {0}", i);
                for (int j = 0; j < jaggedArray2[i].Length; j++)
                    Console.WriteLine("{0} ", jaggedArray2[i][j]);
            }
                Console.ReadKey();
            }
            
	}
}

 

 

 

가변길이배열 이용해서 가족 소개하기

using System;
namespace Hello_World
{
	public class EmptyClass
	{
        static void Main(string[] args)
        {
            string[] joesFamily = new string[] { "Martha", "Robert" };

            string[][] friendsAndFamily = new string[][]
            {
                new string[]{"michael", "Sandy"},
                new string[]{"Frank", "Claudia"},
                new string[]{"Andrew", "Michelle"},
                joesFamily
            };
            Console.WriteLine("Hi {0}, I would like to introduce {1} to you.", friendsAndFamily[0][0], friendsAndFamily[1][0]);
            Console.WriteLine("Hi {0}, I would like to introduce {1} to you.", friendsAndFamily[0][1], friendsAndFamily[2][0]);
            Console.WriteLine("Hi {0}, I would like to introduce {1} to you.", friendsAndFamily[0][1], friendsAndFamily[2][1]);
            Console.WriteLine("Hi {0}, I would like to introduce {1} to you.", friendsAndFamily[3][1], friendsAndFamily[2][1]);
            Console.ReadKey();
         }
            
	}
}

 

 

 

using System;
namespace Hello_World
{
	public class EmptyClass
	{
        static void Main(string[] args)
        {
            int price = 50;
            float pi = 3.14f;
            char at = '@';
            string book = "The Hobbit";

            ParamsMethod2(price, pi, at, book);
            ParamsMethod2("Hello", 5.13, '$');
            ParamsMethod("this", "is", "a", "long", "string", "...");
        }
        public static void ParamsMethod(params string[] sentence)
        {
            for (int i = 0; i < sentence.Length; i++)
            {
                Console.Write(sentence[i] + " ");
            }
        }

        public static void ParamsMethod2(params object[] stuff) // 
        {
            foreach (object obj in stuff)
            {
                Console.Write(obj + " ");
            }
        }

    }
}

 

 

배열로 foreach 이용해서 최소값 구하기

using System;
namespace Hello_World
{
	public class EmptyClass
	{
        static void Main(string[] args)
        {
            int min = MinV2(6, 4, 3, 8, -1, 1, 5);
            Console.WriteLine("The minimum is : {0} ", min);
        }
        public static int MinV2(params int[] numbers)
        {
            int min = int.MaxValue;

            foreach (int number in numbers)
            {
                if (number < min)
                    min = number;
            }
            return min;
        }

    }
}

 

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Hello_World
{
	public class EmptyClass
	{
        static void Main(string[] args)
        {
            //declaring an ArrayList with undefined amount of object
            ArrayList myArrayList = new ArrayList();
            //declaring an ArrayList with undefined amount of object
            ArrayList myArrayList2 = new ArrayList(100); //100 means "how many 'objects' will be in there"

            myArrayList.Add(25);
            myArrayList.Add("Hello");
            myArrayList.Add(13.37);
            myArrayList.Add(13);
            myArrayList.Add(128);
            myArrayList.Add(25.3);
            myArrayList.Add(13);

            //delete element with specific value from the arraylist
            myArrayList.Remove(13); //you need to define what you want to remove
            myArrayList.Remove(13); //you need to define what you want to remove
            myArrayList.Remove(13); //you need to define what you want to remove

            //delete element at specific position
            myArrayList.RemoveAt(0);

            Console.WriteLine(myArrayList.Count);

            double sum = 0;

            foreach (object obj in myArrayList)
            {
               if(obj is int)
                {
                    sum += Convert.ToDouble(obj);
                }else if(obj is double)
                {
                    sum += (double)obj;
                }
               else if(obj is string)
                {
                    Console.WriteLine(obj);
                }
            }
            Console.WriteLine(sum);
            Console.ReadKey();
           
        }
        
    }
}