24 给一个不多于5位的正整数

题目:

• 给一个不多于5位的正整数.
  • 要求一:求它是几位数
  • 要求二:逆序打印出各位数字

 1    public class _024PrintAFigure {
 2 
 3     public static void main(String[] args) {
 4         while (true) {
 5             printAFigure();
 6         }
 7     }
 8 
 9     private static void printAFigure() {
10         Scanner scanner = new Scanner(System.in);
11         System.out.println("请输入不多于五位的正整数:");
12         long a = scanner.nextLong();
13         String string = Long.toString(a);
14         char[] c = string.toCharArray();
15         int j = c.length;
16         if (j <= 5) {
17             System.out.println(a + "是一个" + j + "位数.");
18             System.out.println("按逆序输出是:");
19             for (int i = j - 1; i >= 0; i--) {
20                 System.out.print(c[i] + "  ");
21             }
22             System.out.println();
23         } else {
24             System.out.println("超出了5位数");
25         }
26     }
27 
28 }