Flutter数学运算插件flutter_math_operations的使用

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Flutter数学运算插件flutter_math_operations的使用

本库用于在Flutter中进行基本的算术计算，包括加法、减法、乘法和除法。

使用

要使用此包，请在pubspec.yaml文件中添加flutter_math_operations作为依赖项。

dependencies:
  flutter:
    sdk: flutter
  flutter_math_operations: ^0.0.2

以下是一个完整的示例演示如何使用该插件：

import 'package:flutter/material.dart';
import 'package:flutter_math_operations/flutter_math_operations.dart';

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Math Operations Example'),
        ),
        body: Center(
          child: MathOperationsDemo(),
        ),
      ),
    );
  }
}

class MathOperationsDemo extends StatefulWidget {
  [@override](/user/override)
  _MathOperationsDemoState createState() => _MathOperationsDemoState();
}

class _MathOperationsDemoState extends State<MathOperationsDemo> {
  double result = 0;
  String operation = '';

  void performOperation(String op, double num1, double num2) async {
    switch (op) {
      case '+':
        result = await FlutterMathOperations.add(num1, num2);
        break;
      case '-':
        result = await FlutterMathOperations.subtract(num1, num2);
        break;
      case '*':
        result = await FlutterMathOperations.multiply(num1, num2);
        break;
      case '/':
        result = await FlutterMathOperations.divide(num1, num2);
        break;
    }
    setState(() {
      operation = '$num1 $op $num2 = $result';
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Text(operation),
        SizedBox(height: 20),
        ElevatedButton(
          onPressed: () => performOperation('+', 5, 3),
          child: Text('+'),
        ),
        ElevatedButton(
          onPressed: () => performOperation('-', 5, 3),
          child: Text('-'),
        ),
        ElevatedButton(
          onPressed: () => performOperation('*', 5, 3),
          child: Text('*'),
        ),
        ElevatedButton(
          onPressed: () => performOperation('/', 5, 3),
          child: Text('/'),
        ),
      ],
    );
  }
}