epr24pr1_ojanssen2/main.cpp

#include "std_lib_inc.h"

const vector<string> first_digit_strings = {
"", "ein", "zwei", "drei", "vier", "fuenf", "sechs", "sieben", "acht", "neun"
};

const vector<string> middle_digit_strings = {
"", "zehn", "zwanzig", "deissig", "vierzig", "fuenfzig", "sechzig", "siebzig", "achzig", "neunzig"
};

int main()
{
    int input;
    // ReSharper disable once CppDFAEndlessLoop
    while (true)
    {
        cin >> input;
        if (!cin)
            break;
        if (input < 1 || input > 999)
        {
            cout << "Zahl ausserhalb des gueltigen Bereichs.\n";
            continue;
        }
        int input_length = static_cast<int>(std::to_string(input).length());
        int first_digit = input % 10;
        vector<string> result;
        result.push_back(first_digit_strings[first_digit]);

        int middle_digit = ((input % 100) - first_digit) / 10;
        result.push_back(middle_digit_strings[middle_digit]);

        if (input_length == 3)
        {
            int last_digit = ((input % 1000) - middle_digit) / 100;
            result.push_back(first_digit_strings[last_digit] + "hundert");
        }

        cout << result[2] << result[0] << "und" << result[1] << "\n";
    }
    cout << "Eingabe beendet.\n";
    return 0;
}