【CCF计算机资格认证】201912-1报数C++

#include "iostream"

using namespace std;

int main()
{
    int num, n;
    cin >> n;
    int index = 0, i;
    int people[4] = {0};
    for (i = 1; i <= n; i++)
    {
        num = i;

        if (num % 7 == 0)
        {
            people[index] += 1;
            n++;
        }
        else
        {
            while (num != 0)
            {
                if (num % 10 == 7)
                {
                    people[index] += 1;
                    n++;
                    break;
                }
                num = num / 10;
            }
        }

        index = index == 3 ? 0 : index + 1;
    }
    for (int c : people)
    {
        cout << c << endl;
    }
}