任意整数的反序数---java代码

package xuxiaofei.java.invertedOrder ;

import java.util.Scanner;

public class InvertedOrder {
    public static void main(String[] args) {
        Scanner number = new Scanner(System.in);
        int num;
        System.out.println("必须输入一个正整数：");
        while (true) {
            num = number.nextInt();
            if (num <= 0) {
                System.out.println("必须输入一个正整数：");
            } else {
                System.out.println("您输入的数字是:" + num);
                String b = "";
                while (num != 0) {
                    int nun = num % 10;
                    b = b + nun;
                    num = num / 10;
                }
                int c = Integer.parseInt(b);
                System.out.println("倒序以后为:" + c);
                System.out.println("是否还继续？否请按0；是请按任意数字键");
                Scanner src = new Scanner(System.in);
                int mun = src.nextInt();
                if (0 == mun) {
                    System.out.println("您按啦数字:" + mun + ";程序已经结束任务。");
                    System.exit(0);
                } else {
                    System.out.println("必须输入一个正整数：");
                        }
            }
        }
    }
}