java - 这个相反的顺序我错过了什么？

Question

这是我到目前为止所拥有的:

   import java.util.Scanner;

   public class ReverseNumber {

      public static void main(String args[])
      {
         int n, reverse = 0;

         System.out.println("Enter an integer: ");
         Scanner in = new Scanner(System.in);
         n = in.nextInt();

         while( n != 0 )
         {
             reverse = reverse * 10;
             reverse = reverse + n%10;
             n = n/10;
         }

         System.out.println(" in reverse order is "+reverse);
      }
   }

如果用户输入的是 123，那么它打印出来的内容(现在的样子)是这样的:

输入一个整数:

倒序是321

我需要知道要输入什么才能让它在“按相反顺序是 321”语句前面打印 123。

Answer 1

当您更改输入的值时，您需要将其存储在不同的变量中并更改 Sys out 语句以添加实际值，例如:

public static void main(String[] args) throws FileNotFoundException {

    int input, n, reverse = 0;

    System.out.println("Enter an integer: ");
    Scanner in = new Scanner(System.in);
    n = in.nextInt();
    input = n;
    while( n != 0 )
    {
        reverse = reverse * 10;
        reverse = reverse + n%10;
        n = n/10;
    }

    System.out.println(input + " in reverse order is "+reverse);
}