Given an integer number n, return the difference between the product of its digits and the sum of its digits. code example

Example: Given an integer number n, return the difference between the product of its digits and the sum of its digits.

class Solution {
    public int subtractProductAndSum(int n) {
        int res=0;
        int p=1;
        int sum=0;
        while(n!=0){
            int r=n%10;
            n=n/10;
             p=p*r;
             sum+=r;
        }
        res=p-sum;
        return res;
    }
}