/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package baitap;

import java.util.Scanner;

/**
 *
 * @author Admin
 */
public class SoDoiXung {

    int n;

    public void input() {
        Scanner kb = new Scanner(System.in);
        do {
            System.out.println("Nhap vao so nguyen n: ");
            n = kb.nextInt();
        } while (n <= 0);
    }
    public void ouput1(){
        System.out.println(" cac so doi  xung nho hon "+n);
        for (int i = 0; i < n; i++) {
            if(checkSDX(i)){
                System.out.print(i+" ");
            }
        }
}
    public void output2(){
        Scanner kb = new Scanner(System.in);
        int s =0,dem=0;
        for (int i = 0; i < n; i++) {
            System.out.println("Nhap vao so nguyen thu "+(i+1));
            int a = kb.nextInt();
            if(checkSDX(a)){
                s+=a;
                dem++;
            }
        }
        if(dem==0)System.out.println("TBC so doi xung la:"+0);
        System.out.println("TBC so doi xung la: "+s*1.0/dem);
    }
    private boolean checkSDX(int n) {
        int temp = n,s=0;
        while(temp!=0){
           s=s*10+temp%10;
           temp/=10;
        }
        return s==n;
    }
    public static void main(String[] args) {
        SoDoiXung p = new SoDoiXung();
        System.out.println("Thuc hien bai 1:");
        p.input();
        p.ouput1();
        System.out.println("\nThuc hien bai 2:");
        p.input();
        p.output2();
    }
}