Subtract the Product and Sum of Digits of an Integer

class Solution {
public:
    int subtractProductAndSum(int n) {
        int product = 1 ;
        int sum = 0 ;
        while(n != 0){
            int digit = n%10 ;
            product = product*digit;
            sum = sum + digit ;
            n = n/10;
            int ans = product - sum ;
        }
         int ans = product - sum ;
         return ans ;
        
    }
};