Creating a BMI app in flutter

 import 'package:flutter/material.dart';

import 'package:flutter/rendering.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';

import 'package:intl/intl.dart';
import 'package:waris/IntroPage.dart';
import 'package:waris/ProfileScreen.dart';
//import 'package:waris/splash_screen.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        textTheme: TextTheme(
            headline1: TextStyle(
                fontWeight: FontWeight.bold, fontSize: 25, color: Colors.black),
            subtitle1: TextStyle(
                fontSize: 15,
                fontWeight: FontWeight.bold,
                color: Colors.green)),
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget{

  @override
  State<StatefulWidget> createState() {
return MyHomeState();
  }

}

class MyHomeState extends State<MyHomePage>{

  var wtController =TextEditingController();
  var fttController =TextEditingController();
  var inchController =TextEditingController();
  var result = "";
  var bgColor=Colors.yellow;

  var count = 0;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Stateful widget'),
      ),

      body:Center(
        child: Container(
          color: bgColor,
        width: 400,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center ,

            children: [
              Text('BMI Calculator',style: TextStyle(fontSize: 34,fontWeight: FontWeight.bold),),
              TextField(
                controller: wtController,
                decoration: InputDecoration(
                  label: Text('Enter your weight (in Kgs) '),
                  prefixIcon: Icon(Icons.line_weight)
                ),
                keyboardType: TextInputType.number,
              ),
              TextField(
                controller: fttController,
                decoration: InputDecoration(
                    label: Text('Enter you Height (in Feet) '),
                    prefixIcon: Icon(Icons.height)
                ),
                keyboardType: TextInputType.number,
              ),
              TextField(
                controller: inchController,
                decoration: InputDecoration(
                    label: Text('Enter your Height (in Inches)  '),
                    prefixIcon: Icon(Icons.height)
                ),
                keyboardType: TextInputType.number,
              ),
              ElevatedButton(onPressed: (){
                var wt = wtController.text.toString();
                var ftt = fttController.text.toString();
                var inch = inchController.text.toString();





                if(wt != "" && ftt !="" && inch !=""){

                  var iwt = int.parse(wt);
                  var iftt = int.parse(ftt);
                  var iinch = int.parse(inch);

                  var tinch = (iftt*12) + iinch;
                  var tCm = tinch*2.54;
                  var tM = tCm/100;
                  var bmi = iwt/(tM*tM);

                  var message= "";

                  if(bmi>25){
                    message="You are overweight";
                    bgColor = Colors.orange;

                  } else if(bmi<18){
                    message = 'You are underWeight';
                    bgColor= Colors.red;

                  }else{
                    message= 'You are healthy';
                    bgColor = Colors.green;

                  }

                 setState(() {
                   result = "$message \nYour BMI is :${bmi.toStringAsFixed(4)}";
                 });

                }else{
                  setState(() {
                    result = "plz fill all required fields!!";
                  });

                }

              }, child: Text('Calculate')),
              Text(result,style: TextStyle(
                fontSize: 16
              ),)
            ],
          ),
        ),
      )
    );
  }

}