牛牛的身高错在哪里了？

代码：

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int t = sc.nextInt();
    int[] arr = new int[t];
    for (int i = 0; i < t; i++) {
        arr[i] = Integer.parseInt(sc.next());
        int ch = 10;
        while (arr[i] / ch > 0) {
            int y = arr[i] % ch;
            if (y >= ch /2) {
                arr[i] = arr[i] + (ch - y);
            }
            ch *= 10;
        }
        System.out.println(arr[i]);
    }
}

}