1295. Find Numbers with Even Num

附leetcode链接：https://leetcode.com/problems/find-numbers-with-even-number-of-digits/
1295. Find Numbers with Even Number of Digits
Given an array nums of integers, return how many of them contain an even number of digits.

public int numbersWithEvenNumDig(int[] nums) {
     int num = 0;
      for(int i = 0;i<nums.length;i++) {
            int n = 0;
            while(nums[i]>0){
                  nums[i] /= 10; 
                  n++;
            }
            if(n%2==0)
                  num++;
      }
      return num;
}

小结：对于数组，明确循环次数，用for；对于数字，有多少位是未知的，因此用while；判断数字的位数，常对10求商、求余；