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C-/C++-Quelltext

std::rand() % 25 + 'A'

C-/C++-Quelltext

static const char* lut = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
// ...

... : lut[ std::rand() % 25 ]

C-/C++-Quelltext

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>
#include <fstream>

void generate_password(const std::string&, std::size_t, std::string&);

int main ()
{
    std::srand(std::time(0));
    bool close = false;
    while (close == false)
    {
        std::cout   << "Password Generator V1.0BETA\n"
                    << "Copyright (c) 2007 Devil Entertainment\n"
                    << "--------------------------------------\n"
                    << "\t(0) Password generieren\n"
                    << "\t(1) Beenden" << std::endl;

        while (!(std::cin >> close)) { std::cin.clear(); std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); }
        if (close == false)
        {
            std::cout << "Laenge: ";
            std::size_t len = 0;
            while (!(std::cin >> len)) { std::cin.clear(); std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); }
            std::string password;
            generate_password("config.dat", len, password);
            std::cout << "Passwort: " << password << std::endl;
        }
    }
} 

void generate_password(const std::string& config_file, std::size_t len, std::string& pass)
{
    pass = "";
    std::ifstream file_stream(config_file.c_str(), std::ios::in);
    if (!file_stream)
        throw std::runtime_error(std::string("File does not exist! => ") + config_file);

    std::vector<char> static_values;
    char val = 0;
    while ((file_stream >> val))
        static_values.push_back(val);

    for (std::size_t i = 0; i < len; ++i)
        pass[i] = (i % 2 ? static_values[i % static_values.size()] : std::rand() % 25 + 'A' /* 65 - 90 == Großbuchstaben! */);
}

C-/C++-Quelltext

void generate_password(const std::string& config_file, std::size_t len, std::string& pass)
{
    pass = std::string('*', len);
    std::vector<char> static_values;
    std::ifstream file_stream(config_file.c_str(), std::ios::in);
    if (file_stream)
    {
        char val = 0;
        while ((file_stream >> val))
            static_values.push_back(val);
    }
    if (static_values.size() != 0)
        for (std::size_t i = 0; i < len; ++i)
            pass[i] = (i % 2 ? static_values[i % static_values.size()] : std::rand() % 25 + 'A');
    else
        for (std::size_t i = 0; i < len; ++i)
            pass[i] = (i % 2 ? std::rand() % 10 + '0' : std::rand() % 25 + 'A');
}

Quellcode

aeiouAEIOU1368

C-/C++-Quelltext

while (!(std::cin >> close)) { std::cin.clear(); std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); }