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JavaScript:
[JavaScript] <body onLoad="changeInt(3)"> <input type="text" onkeyUp="changeInt(this.value); - Pastebin.com

Code

<body onLoad="changeInt(3)">
<input type="text" onkeyUp="changeInt(this.value);" onkeyDown="changeInt(this.value);" value="3">
<b>dein resultat: </b>
<span id="result">
Warte...
</span>
</body>
<script>
var nInt = 3;
var abc = ['a','b','c','d','e','f','g','h','j','k','m','n','p','q','r','s','t','u','v','w','x','y','z'];


function getRandom(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
}


function get_letter(ai, modus) {


    if(ai > (abc.length-1)) {
        return get_letter(ai-abc.length, modus);
    }

    return modus == 1 ? abc[ai] : abc[ai].toUpperCase();
}


function changeInt(ni) {
    nInt = ni;

    var strings = [];

    for(var i = 1; i <= nInt; i++) {
        modus = getRandom(1, 3);
        strings.push(get_letter(getRandom(0, 10000), modus));
    }

    var result = '';
    document.getElementById('result').innerHTML = 'Warte...';

    strings.forEach(function(el, index, arr) {
        result +=el;
    });

    document.getElementById('result').innerHTML = result;
}
</script>

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..prox

C/C++

C

#include <iostream>
#include <stdlib.h>
#include <time.h>
using namespace std;
const char NEG = 65;
const char POS = 90;
char getRandom()
{
    return NEG+(rand()%(POS-NEG-1));
}
int main()
{
    srand(time(NULL));
    char wort[6];
    for(char i = -1; i < 6; i++)
        wort[i] = getRandom();
    cout << wort << endl;
    while(true);
    return 0;
}

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C#:

C#

using System;
namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            Random rnd = new Random();
            string wort = "";
            for (int i = 0; i < 6; i++)
            {
                wort += Convert.ToChar(rnd.Next(65, 90)).ToString();
            }
            Console.WriteLine(wort);
            Console.ReadLine();
        }
    }
}

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