Mon. May 29th, 2023

Main.dart

import 'package:flutter/material.dart';


void main() {
  runApp(myApp());
}
class myApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.deepOrange,
      ),
      home: HomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}
class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Calculator'),
      ),
      body: Container(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: <Widget>[
            Expanded(
              child: Container(
                padding: EdgeInsets.all(10.0),
                alignment: Alignment.bottomRight,
                child: Text(
                  text,
                  style: TextStyle(
                      fontSize: 60.0,
                      fontWeight: FontWeight.w500,
                      color: Colors.deepOrange),
                ),
              ),
            ),
            Row(
              children: <Widget>[
                customOutlineButton("9"),
                customOutlineButton("8"),
                customOutlineButton("7"),
                customOutlineButton("+"),
              ],
            ),
            Row(
              children: <Widget>[
                customOutlineButton("6"),
                customOutlineButton("5"),
                customOutlineButton("4"),
                customOutlineButton("-"),
              ],
            ),
            Row(
              children: <Widget>[
                customOutlineButton("3"),
                customOutlineButton("2"),
                customOutlineButton("1"),
                customOutlineButton("x"),
              ],
            ),
            Row(
              children: <Widget>[
                customOutlineButton("C"),
                customOutlineButton("0"),
                customOutlineButton("="),
                customOutlineButton("/"),
              ],
            ),
          ],
        ),
      ),
    );
  }
  Widget customOutlineButton(String val) {
    return Expanded(
      child: OutlinedButton(
        // padding: EdgeInsets.all(25.0),
        onPressed: () => btnClicked(val),
        child: Text(
          val,
          style: TextStyle(fontSize: 35.0, color: Colors.deepOrange),
        ),
      ),
    );
  }
  late int first, second;
  late String res, text = "";
  late String opp;
  void btnClicked(String btnText) {
    if (btnText == "C") {
      res = "";
      text = "";
      first = 0;
      second = 0;
    } else if (btnText == "+" ||
        btnText == "-" ||
        btnText == "x" ||
        btnText == "/") {
      first = int.parse(text);
      res = "";
      opp = btnText;
    } else if (btnText == "=") {
      second = int.parse(text);
      if (opp == "+") {
        res = (first + second).toString();
      }
      if (opp == "-") {
        res = (first - second).toString();
      }
      if (opp == "x") {
        res = (first * second).toString();
      }
      if (opp == "/") {
        res = (first ~/ second).toString();
      }
    } else {
      res = int.parse(text + btnText).toString();
    }
    setState(() {
      text = res;
    });
  }
}

Output

By Rajashekar

Iā€™m (Rajashekar) a core Android developer with complimenting skills as a web developer from India. I cherish taking up complex problems and turning them into beautiful interfaces. My love for decrypting the logic and structure of coding keeps me pushing towards writing elegant and proficient code, whether it is Android, PHP, Flutter or any other platforms. You would find me involved in cuisines, reading, travelling during my leisure hours.

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