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/**
 * Erzeuge einige zufällige Web-Codes
 * Vorgabe: Kleinbuchstaben und Ziffern, ohne 1 (eins) und ohne l (kleines Ell), ebenso ohne Oh(O).
 * @author Philipp Gressly (phi@gressly.ch)
 */
/*
 * History: first Implementation: May 25, 2010
 * Bugs   :
 */
public class WebCode {
  public static void main(String[] args) {
    new WebCode().top();
  }
 
  
  char [] GUELTIGE_ZEICHEN = {'2', '3', '4', '5', '6', '7', '8', '9',
                              'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
                              'j', 'k', 'm', 'n', 'o', 'p', 'q', 'r', 's',
                              't', 'u', 'v', 'w', 'x', 'y', 'z'};
  int CODE_LAENGE = 8;
  
  void top() {
      int anz = 5; // Einige Codes erzeugen
      while(anz > 0) {
          String code = erzeugeWebCode();
          System.out.println("Code = " + code);
          anz = anz - 1;
      }
  }
  
  String erzeugeWebCode() {
      String code = "";
      int zeichenPosition = 1;
      while(zeichenPosition <= CODE_LAENGE) {
          int zufallsPosition = (int) (Math.random() * GUELTIGE_ZEICHEN.length);
          char zufallsZeichen = GUELTIGE_ZEICHEN[zufallsPosition];
          code = code + zufallsZeichen;
          zeichenPosition = zeichenPosition + 1;
      }
      return code;
  }
  
}  // end of class WebCode
                

/**
 * Erzeuge einige zufällige Web-Codes
 * Vorgabe: Kleinbuchstaben und Ziffern, ohne 1 (eins) und ohne l (kleines Ell).
 * @author Stefan Dürrenberger (sd@pm7.ch)
 */
for ($i = 0; $i < 5; $i++)
{
    echo generateWebCode() . "\n";
}

function generateWebCode($length = 8)
{
    $characters = "23456789abcdefghijkmnopqrstuvwxyz";
    for ($i = 0; $i < $length; $i++)
    {
        $webCode .= $characters[mt_rand(0, strlen($characters) - 1)];
    }
    return $webCode;
}
                

import random
def webcode():
    zeichen = ['2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c',
               'd', 'e', 'f', 'g', 'h', 'i','j', 'k', 'm', 'n', 'o',
               'p', 'q', 'r', 's','t', 'u', 'v', 'w', 'x', 'y', 'z']
    webcode = ''
    for i in range(8):
        random.shuffle(zeichen)
        webcode = webcode + zeichen[0]
    return webcode

print webcode()
                

#include "stdafx.h"
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main()
{
	char strErlaubt[] = { '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i','j', 'k', 'm', 'n', 'o', 'p', 'q', 'r', 's','t', 'u', 'v', 'w', 'x', 'y', 'z' };
	char strText[8];
	int iZufall = 0;
	int iLänge = 0;

	srand(time(NULL));

	for(int i = 0; i < 8; i += 1) {
		iZufall = rand() % 33 + 1;
		strText[i] = strErlaubt[iZufall];
	}

	printf("Web-Code: ");

	for(int i = 0; i < 8; i += 1) {
		printf("%c", strText[i]);

		if(i == 3) {
			printf(" ");
		}
	}

	getchar();
	return 0;
}
                

Lösung von: Elias Zech (Optics Balzers)

function randomWebCode() {
  let digits = '23456789abcdefghjkmnopqrstuvwxyz'.split(''),
  code = '';
  while (code.length < 8)
    code += digits[Math.floor(Math.random() * digits.length)];
  return code;
}

for (let i = 1; i <= 5; i++) console.log(randomWebCode());   // lissalanda@gmx.at

                

Lösung von: Lisa Salander (Heidi-Klum-Gymnasium Bottrop)

// NET 6.x | C# 10.x | VS-2022

// Variante 1 (komfortable Kurzschreibweise [pattern], aber deutlich ineffizienter bei der Ausführung)
var allowedChars1 = "2-9a-hj-z";
var arrChars1 = new System.Text.RegularExpressions.Regex(@"[" + allowedChars1 + "]").Matches(new string(Enumerable.Range(0, 256).Select(x => (char)x).ToArray())).ToArray();
PrintWebCode(arrChars1, 8, 5);

// Variante 2 
var allowedChars2 = "23456789abcdefghjkmnopqrstuvwxyz";
var arrChars2 = allowedChars2.ToCharArray();
PrintWebCode(arrChars2);

// Variante 3
var arrChars3 = new List<char>();
for (int i = '2'; i <= 'z'; i++)
    if (char.IsDigit((char)i) || char.IsLower((char)i) && (char)i != 'l')
        arrChars3.Add((char)i);
PrintWebCode2(arrChars3.ToArray(), 8);

// Ausgabe Variante 1 (LINQ + Lambda)
void PrintWebCode<T>(T[] arr, int l = 8, int n = 1) => Enumerable.Range(0, n).ToList().ForEach(x => Console.WriteLine(string.Join("", arr.OrderBy(x => Guid.NewGuid()).Take(l))));

// Ausgabe Variante 2 (klassisch)
void PrintWebCode2<T>(T[] arr, int l = 8, int n = 1) {
    for (int i = 0; i < n; i++) {
        for (int k = 0; k < l; k++)
            Console.Write(arr[new Random().Next(0, arr.Length)]);
        Console.WriteLine();
    }
}
                

Lösung von: Jens Kelm (@JKooP)

// C++ 14 | VS-2022

#include <iostream>

std::string get_webCode(const std::string allowedChars = "23456789abcdefghjkmnopqrstuvwxyz") {
	std::string webCode{};
	for (auto i{ 0 }; i < 8; i++)
		webCode.push_back(allowedChars[rand() % allowedChars.size()]);
	return webCode;
}

int main() {
	srand((int)time(nullptr));
	for (auto i{ 0 }; i < 5; i++)
		std::cout << get_webCode() << std::endl;
}
                

Lösung von: Jens Kelm (@JKooP)

' als VBA-Funktion
Function GetWebCode(Optional allowedChars As String = "23456789abcdefghjkmnopqrstuvwxyz") As String
    Randomize
    Dim webCode As String, i As Integer
    For i = 1 To 9
        webCode = webCode + IIf(i = 5, "-", Mid(allowedChars, Int(Rnd * Len(allowedChars)) + 1, 1))
    Next
    GetWebCode = webCode
End Function
                

Lösung von: Jens Kelm (@JKooP)