Keuntungan Mengikuti Pelatihan dan Sertifikasi BNSP bagi Junior Mobile Programmer

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Kalkulator Sederhana')),
        body: Calculator(),
      ),
    );
  }
}

class Calculator extends StatefulWidget {
  @override
  _CalculatorState createState() => _CalculatorState();
}

class _CalculatorState extends State<Calculator> {
  final TextEditingController _number1Controller = TextEditingController();
  final TextEditingController _number2Controller = TextEditingController();
  String _result = '';

  void _calculate(String operation) {
    double number1 = double.parse(_number1Controller.text);
    double number2 = double.parse(_number2Controller.text);
    double calculationResult;

    if (operation == 'add') {
      calculationResult = number1 + number2;
    } else {
      calculationResult = number1 - number2;
    }

    setState(() {
      _result = 'Hasil: $calculationResult';
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        TextField(
          controller: _number1Controller,
          decoration: InputDecoration(labelText: 'Masukkan Angka Pertama'),
          keyboardType: TextInputType.number,
        ),
        TextField(
          controller: _number2Controller,
          decoration: InputDecoration(labelText: 'Masukkan Angka Kedua'),
          keyboardType: TextInputType.number,
        ),
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: [
            ElevatedButton(
              onPressed: () => _calculate('add'),
              child: Text('Tambah'),
            ),
            ElevatedButton(
              onPressed: () => _calculate('subtract'),
              child: Text('Kurang'),
            ),
          ],
        ),
        Text(_result),
      ],
    );
  }
}