Mad With Flutter lab

import 'package:flutter/material.dart';

void main() => runApp(QuizApp());

class QuizApp extends StatefulWidget {
  @override
  _QuizAppState createState() => _QuizAppState();
}

class _QuizAppState extends State {
  final List> _questions = [
    {
      'question': 'What is the capital of India?',
      'answers': [
        {'text': 'Mumbai', 'score': 0},
        {'text': 'Delhi', 'score': 1},
        {'text': 'Kolkata', 'score': 0},
      ],
    },
    {
      'question': '2 + 2 = ?',
      'answers': [
        {'text': '3', 'score': 0},
        {'text': '4', 'score': 1},
        {'text': '5', 'score': 0},
      ],
    },
    
  ];

  int _currentIndex = 0;
  int _totalScore = 0;

  void _answerQuestion(int score) {
    setState(() {
      _totalScore += score;
      _currentIndex++;
    });
  }

  void _resetQuiz() {
    setState(() {
      _currentIndex = 0;
      _totalScore = 0;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Quiz App',
      home: Scaffold(
        appBar: AppBar(title: Text('Quiz App')),
        body: _currentIndex < _questions.length
            ? Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text(
                    _questions[_currentIndex]['question'] as String,
                    style: TextStyle(fontSize: 22),
                    textAlign: TextAlign.center,
                  ),
                  SizedBox(height: 20),
                  ...(_questions[_currentIndex]['answers'] as List>).map((answer) {
                    return Padding(
                      padding: const EdgeInsets.symmetric(vertical: 5),
                      child: ElevatedButton(
                        onPressed: () => _answerQuestion(answer['score'] as int),
                        child: Text(answer['text'] as String),
                      ),
                    );
                  }),
                ],
              )
            : Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Text('Your Score: $_totalScore',
                        style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold)),
                    SizedBox(height: 20),
                    ElevatedButton(
                      onPressed: _resetQuiz,
                      child: Text('Restart Quiz'),
                    ),
                  ],
                ),
              ),
      ),
    );
  }
}