Random Numbers - CSharp System

CSharp examples for System:Random

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Description

Random Numbers

Demo Code


using System.IO;/*from   w ww  .  j a  v  a2  s  .  c om*/
using System.Collections;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;

public class Main{
        public static ArrayList RandomNumbers(int max)
        {
            // Create an ArrayList object that will hold the numbers
            ArrayList lstNumbers = new ArrayList();
            // The Random class will be used to generate numbers
            Random rndNumber = new Random();

            // Generate a random number between 1 and the Max
            int number = rndNumber.Next(1, max + 1);
            // Add this first random number to the list
            lstNumbers.Add(number);
            // Set a count of numbers to 0 to start
            int count = 0;

            do // Repeatedly...
            {
                // ... generate a random number between 1 and the Max
                number = rndNumber.Next(1, max + 1);

                // If the newly generated number in not yet in the list...
                if (!lstNumbers.Contains(number))
                {
                    // ... add it
                    lstNumbers.Add(number);
                }

                // Increase the count
                count++;
            } while (count <= 10 * max); // Do that again

            /////Casting from ArrayList to List<string>
            //List<int> randomNoList = new List<int>();
            //int[] tempArr = (int[])lstNumbers.ToArray();
            //randomNoList = tempArr.ToList();

            // Once the list is built, return it
            return lstNumbers;
        }
}

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