moozi

//null safety double? a=null; a=10.05; a=null; print(a?.toInt()); // a가 null이면 null리턴. 아니면 toInt()실행 // if(a!=null) // return a.toInt(); // else // return null; double b; // non nullable a=10; b=a!; // nullable to non nullable print(b); double c; a=7; c=a??100; //a가 null이면 100을 대입. 아니면 a값을 대입 print(c);

http://naver.me/Gguvfe6z

https://drive.google.com/file/d/1mfKKLSArzzLAxfncaoDB39vWYTgUVX-e/view?usp=sharing kakaomap_test.zip drive.google.com

import 'package:flutter/material.dart'; import 'package:flutter/services.dart'; import 'dart:async'; class HomeScreen extends StatefulWidget { const HomeScreen({Key? key}) : super(key: key); @override State createState() => _HomeScreenState(); } // ❷ State 정의 class _HomeScreenState extends State { final PageController pageController = PageController(); @override void initState() { super.initStat..

https://drive.google.com/file/d/1zfxBmS5v7ef2Kw_DgTYbAtAbnKVNGp6t/view?usp=sharing

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