Subtract the Product and Sum of Digits of an Integer

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

Example 1:

Input: n = 234
Output: 15 
Explanation: 
Product of digits = 2 * 3 * 4 = 24 
Sum of digits = 2 + 3 + 4 = 9 
Result = 24 - 9 = 15

思路：取最后一位 % 10;

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

 

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