java - 一个 Java 程序，获取一个整数，分隔各个数字并给出数字之和

Question

下面是我的代码，我已经能够获得数字之和，但我不知道如何干净地分离和打印整数的各个数字。它可以在我的“do”循环中完成吗？

import java.util.*;

public class Ch5PgEx1 {

  static Scanner console = new Scanner(System.in);

  public static void main(String[] args) {

    int num;
    int sum;
    int remainder;
    int count;

    System.out.print("Please enter an integer: ");
    num = console.nextInt();
    System.out.println();

    sum = 0;
    count = 0;

    do {
        remainder = num % 10;
        sum = sum + remainder;
        num = num / 10;
        count++;
    }
    while (num > 0);


    System.out.print("There are " + count + " digits in your number. \nThe sum of the individual digits is:" + sum);
    System.out.println();
  } 
}

Answer 1

1. 要打印它们，只需添加打印行

   do {
       remainder = num % 10;
       sum = sum + remainder;
       num = num / 10;
       count++;
       System.out.println(remainder);
   } while (num > 0);
   
   /*
   Please enter an integer: 123456789
   
   9
   8
   7
   6
   5
   ...
   

2. 将它们存储在数组中

   int[] res = new int[Integer.toString(num).length()];
   do {
       remainder = num % 10;
       sum = sum + remainder;
       num = num / 10;
       res[count++] = remainder;  // LINE 1
   } while (num > 0);
   
   /*
   Please enter an integer: 123456789
   
   [9, 8, 7, 6, 5, 4, 3, 2, 1]
   ...
   

   以[1, 2, 3, 4, 5, 6, 7, 8, 9]方式获取数组:

   • 将 LINE 1 更改为 res[res.length -++count] = approximation;