#include <stdio.h>
#include <stdlib.h>

long int ZahlBinaer(int num)
{
    int sum = 0;
    for (int mult = 1, mod = 2; num > 0; mult *= 10, mod *= 2)
    {
        if (num % mod)
        {
            sum += mult;
            num -= mod / 2;
        }
    }
    return sum;
}
int ZahlOktal(int num)
{
    int sum = 0;
    for (int mult = 1, mod = 8, div = 1; num > 0; mult *= 10, mod *= 8, div *= 8)
    {
        if (num % mod)
        {
            sum += (num % mod / div) * mult;
            num -= num % mod;
        }
    }
    return sum;
}
int main(int argc, char *argv[])
{
    int doBin = 0;
    int doHex = 0;
    int doOct = 0;
    int num = 0;

    for (int i = 1; i < argc; i++)
    {
        if (argv[i][0] != '-')
        {
            if (num == 0)
            {
                num = atoi(argv[i]);
                printf("Dezimal: %d\n", num);
                if (argc == 2)
                {
                    doBin = 1, doHex = 1, doOct = 1;
                }
            }
            else
            {
                printf("Nur eine Zahl ist erlaubt!\n\n");
                printf("Nur folgende Parameter sind erlaubt:\n--b Binaersystem\n--o Oktalsystem\n--h Hexadezimalsystem");
                return 0;
            }
        }
        else
        {
            int j = 2;
            while (argv[i][j] != '\0')
            {
                if (argv[i][j] == 'b')
                {
                    doBin = 1;
                }
                else if (argv[i][j] == 'o')
                {
                    doOct = 1;
                }
                else if (argv[i][j] == 'h')
                {
                    doHex = 1;
                }
                else
                {
                    printf("Unerlaubte Option: --%c\n", argv[i][j]);
                    return 0;
                }
                j++;
            }
        }
    }
    if (doBin)
    {
        printf("Binär: %ld\n", ZahlBinaer(num));
    }
    if (doHex)
    {
        printf("Hexadezimal: %X\n", num);
    }
    if (doOct)
    {
        printf("Oktal: %d\n", ZahlOktal(num));
    }
    return 1;
}