Question

How to select random two digits from anywhere in a number with C#

Answer 1

using System;

class RandomTwoDigitsProgram
{
    // Function to select random two distinct digits from a number
    public static string GetRandomTwoDigits(long number) {
        string numStr = number.ToString();

        if (numStr.Length < 2) {
            return "Error: number must have at least 2 digits";
        }

        Random rand = new Random();

        int i = rand.Next(numStr.Length);
        int j;
        do {
            j = rand.Next(numStr.Length);
        } while (j == i);  // ensure different positions

        // Form the two-digit string
        return $"{numStr[i]}{numStr[j]}";
    }

    static void Main()
    {
        long num = 1234567;
        string randomTwo = GetRandomTwoDigits(num);

        Console.WriteLine("Random two digits: " + randomTwo);
    }
}



/*
run:

Random two digits: 72

*/

 

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