Most occuring digit

#include <iostream>
#include <string>

using namespace std;

int max_occurrences(int [], size_t);
int digitOccurence(long int number, int digit);

int main() {

    int array[] = { 1, 2, 3, 4, 5, 6, 6 };

    cout << endl << max_occurrences(array, 7) << endl;

    return 0;
}

int max_occurrences(int array[], size_t array_size) {
    string str;
    string::size_type sz;

    size_t max_count = 1, result = 0;

    for (size_t i = 0; i < array_size; i++) {
        str += to_string(array[i]);
    }

    long number = stol(str, &sz);

    cout << number << endl;

    for (size_t i = 0; i < 10; i++) {
        int count = digitOccurence(number, i);

        if (count >= max_count) {
            max_count = count;
            result = i;
        }
    }

    return result;
}

int digitOccurence(long int number, int digit) {
    int count = 0;
    while (number) {
        if (number % 10 == digit)
            count++;

        number /= 10;
    }

    return count;
}