2520. Count the Digits That Divide a Number

Given an integer num, return the number of digits in num that divide num.

An integer val divides nums if nums % val == 0.

class Solution {
public:
    int countDigits(int num) {
        int res = 0;
        int n = num;
        while(n) {
            int d = n % 10;
            if(d != 0) {
                if(num % d == 0) res += 1;
            }
            n /= 10;
        }
        return res;
    }
};