issue with c# Random

Question

using System;

namespace arrays
{
    class Program
    {
        static void Main(string[] args)
        {
            Random rand = new Random();
            int items = 10;
            int[] test = new int[items];


            //write items random int
            for (int i = 0; i < items; i++)
            {
                test[i] = rand.Next(0,2); 
// should make test[i] range between 0 and 2 NOT 0 and 1?
// rand.Next(0,1); should include 1?
// dont get the logic in Random, could someone explain why this is not so

            }

            // output items arrays
            Console.WriteLine(test.Length);
            for (int t = 0; t < items; t++)
            {
                Console.Write("  t=" + t + "  test=");
                Console.WriteLine(test[t]);
            }
            Console.ReadLine();


        }

    }
}

Answer 1

@r ht , if you want to make the member of the array between 0 and 2, please use test[i] = rand.Next(0,3);

As the Microsoft doc said:

The Next(Int32, Int32) overload returns random integers that range from minValue to maxValue - 1. However, if maxValue equals minValue, the method returns minValue.

You can find the sentence from the doc Random.Next Method.

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Answer 2

Hi, rand.Next doesn't work that way.

If you want to get a number in the range of 0 to N, then use the following:

rand.Next(N + 1)

In your case, you want number from 0 to 2, so use the following
//Get random number.
Random rand = new Random();

//2 + 1 = 3
int iRnd = rand.Next(3).ToString();

I should mention that .Next(3) is equivalent to .Next(0, 3) only when you want the minimum to be 0.

Good luck! Saga