Question

How to generate 20 digits random number in C#

Answer 1

using System;

class Generate20DigitsRandomNumber_CSharp
{
    static decimal Generate20DigitsRandomNumber() {
        Random rand = new Random(); 
     
        string s = string.Empty;
        
        for (int i = 0; i < 20; i++) {
            s = String.Concat(s, rand.Next(1, 9).ToString());
        } 
        
        decimal dec;
        if (!Decimal.TryParse(s, out dec)) {
            Console.WriteLine("Error: Decimal.TryParse(s, out dec)");
            return -1;
        }
        
        return dec;
    }

    static void Main()
    {
       Console.WriteLine(Generate20DigitsRandomNumber());
    }
}
  
  
  
/*
run:
  
81145816162142451782
 
*/

 

70+ SQL courses for beginners and professionals