java输入数字,输出倒序的实例

package c10; 
import java.util.Scanner; 
public class zhengzhengshu {
 
 public static void main(String[] args) {
 Scanner input = new Scanner(System.in);
 System.out.println("输入一个正整数:");
 int num = input.nextInt();
 while (num != 0) {
  int b = num % 10;
  num = num / 10;
  System.out.print(b);
 }
 }
}

import java.util.Scanner; 
class Cycle01
{
 public static void main(String[] args)
 {
 Scanner input = new Scanner(System.in);
 System.out.print("输入一个整数：");
 int num = input.nextInt();
 while (num!=0)
 {
  System.out.print(num % 10);
  num /= 10;
 }
 }
}

class Cycle02
{
 public static void main(String[] args)
 {
 //注意：num >=0 
 Scanner input = new Scanner(System.in);
 System.out.print("请输入一个整数：");
 int num = input.nextInt();
 String reverse = "";
 
 while (num != 0)
 {
  reverse += num % 10;
  num /= 10;
 }
 
 System.out.println(reverse); 
 }
}

class Cycle03
{
 public static void main(String[] args)
 {
 Scanner input = new Scanner(System.in);
 System.out.print("请输入一个整数：");
 int num = input.nextInt();
 int result = 0;
 
 while(num!=0)
 {
  int x = num % 10;
  result = result * 10 + x; 
  num /= 10;
 }
 
 System.out.println(result);
 }
}