Flutter: AppBar and FloatingActionButton in main function

import 'package:flutter/material.dart';

void main(){
  
  var app = MaterialApp(
    
    home: Scaffold(

      appBar: AppBar(
        title: Text("Let's see Image"),
      ),

      floatingActionButton: FloatingActionButton(

        child: Icon(Icons.add),

        onPressed: (){
          print('Hi Floating Action Button');
        },

      ),


    )

  );



  runApp(app);

}