#include <iostream>

using namespace std;

void hex() {
    int i,k,n,m;

    cout << "Podaj liczbe dziesietna: ";
    cin >> n;
    int *a = new int[n];
    
    m=n;

    i = 1;
    while(m>=1) {
        a[i] = m % 16;
        m = m / 16;
        i++;
    }

    k = i - 1;

    cout << endl;

    for(i = 1; i <= k; i++) {
        if(i % 4 == 0) {
            cout << " ";
        }
        if(a[i] > 9) {
            if(a[i] == 10) {
                cout << "A";
            }
            if(a[i] == 11) {
                cout << "B";
            }
            if(a[i] == 12) {
                cout << "C";
            }
            if(a[i] == 13) {
                cout << "D";
            }
            if(a[i] == 14) {
                cout << "E";
            }
            if(a[i] == 15) {
                cout << "F";
            }
        } 
        else {
            cout << a[i];
        }

    }

    cout << endl;

    delete [] a;
}

void octal() {
        int i,k,n,m;

    cout << "Podaj liczbe dziesietna: ";
    cin >> n;
    int *a = new int[n];
    
    m=n;

    i = 1;
    while(m>=1) {
        a[i] = m % 8;
        cout << a[i] << " ";
        m = m / 8;
        i++;
    }

    k = i - 1;

    cout << endl << "K = " << k << endl;

    for(i = 1; i <= k; i++) {
        if(i % 3 == 0) {
            cout << " " << a[i];
        }
        else {
            cout << a[i];
        }
    }

    cout << endl;

    delete [] a;
}

int main() {
    char choice;

    cout << "Wybierz system :" << endl;
    cout << "1. Binarny" << endl;
    cout << "2. Oktalny" << endl;
    cout << "3. Decymanalny" << endl;
    cout << "4. Hexadecimalny" << endl;
    cout << "Podaj swoj wybor: ";

    cin >> choice;

    switch(choice) {
        case '1':
            cout << "Wybierasz system binarny." << endl;
            break;
        case '2':
            system("cls");
            cout << "Wybierasz system oktalny." << endl;
            octal(); 
        case '3':
            cout << "Wybierasz system dziesietny." << endl;
            break;
        case '4':
            system("cls");
            cout << "Wybierasz system szesnastkowy." << endl;
            hex();
        default:
            break;
    }

    system("pause");
    return 0;
}