java输入数字，输出倒序

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);
		}
	}
}

控制台效果显示：