1281. Subtract the Product and Sum of Digits of an Integer

class Solution {
public:
    int subtractProductAndSum(int n) {
        long sum = 0, product = 1;
        while(n)
        {
            int r = n%10;
            sum += r;
            product *= r;
            n = n/10;
        }

        return (product - sum);
    }
};