Podzborovi so dolzhina "k"

// Da se najdat site razlichni podzborovi so dolzhina "k" vo nekoj zbor.

#include <iostream>

using namespace std;

int main()
{
    char word[500];
    int k, length = 0;

    cout << "Vnesi zbor: ";
    cin >> word;
    cout << "Vnesi dolzhina na podzbor: ";
    cin >> k;
    cout << endl;

    do
    {
        length++;
    } while (word[length] != '\0');

    if (k > length)
    {
        cout << "Dolzhinata na podzborot ne mozhe da bide pogolema od samiot zbor!" << endl;
        return 1;
    }

    for (int i = 0; i <= length - k; ++i)
    {
        char subword[k + 1];

        for (int j = 0; j < k; ++j)
        {
            subword[j] = word[i + j];
        }

        subword[k] = '\0';

        cout << subword << endl;
    }

    return 0;
}