bmi calculater in dart language

[hiteshkumar2004]

import 'package:flutter/material.dart';

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

class BMICalculator extends StatefulWidget {
@OverRide
_BMICalculatorState createState() => _BMICalculatorState();
}

class _BMICalculatorState extends State {
// Variables to hold user input
double weight = 0.0;
double height = 0.0;
String selectedGender = 'Boy';

// Variable to hold the BMI result
String bmiResult = '';

@OverRide
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('BMI Calculator'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
// User input fields
TextField(
keyboardType: TextInputType.number,
onChanged: (value) {
setState(() {
weight = double.tryParse(value) ?? 0.0;
});
},
decoration: InputDecoration(labelText: 'Weight (kg)'),
),
TextField(
keyboardType: TextInputType.number,
onChanged: (value) {
setState(() {
height = double.tryParse(value) ?? 0.0;
});
},
decoration: InputDecoration(labelText: 'Height (cm)'),
),

          // Gender selection
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Radio(
                value: 'Boy',
                groupValue: selectedGender,
                onChanged: (value) {
                  setState(() {
                    selectedGender = value!;
                  });
                },
              ),
              Text('Boy'),
              Radio(
                value: 'Girl',
                groupValue: selectedGender,
                onChanged: (value) {
                  setState(() {
                    selectedGender = value!;
                  });
                },
              ),
              Text('Girl'),
            ],
          ),

          ElevatedButton(
            onPressed: calculateBMI,
            child: Text('Calculate BMI'),
          ),

          // BMI result display
          Text(
            bmiResult,
            style: TextStyle(fontSize: 18.0, fontWeight: FontWeight.bold),
            textAlign: TextAlign.center,
          ),
        ],
      ),
    ),
  ),
);

}

// Calculate BMI function
void calculateBMI() {
if (height == 0.0) {
setState(() {
bmiResult = 'Please enter a valid height.';
});
return;
}

// Convert height from cm to meters
double heightMeters = height / 100.0;

// Calculate BMI differently based on gender
double bmi;
if (selectedGender == 'Boy') {
  bmi = weight / (heightMeters * heightMeters);
} else {
  // Adjust the formula for girls (you can use different constants)
  bmi = weight / (heightMeters * heightMeters);
}

// Determine the BMI category for interpretation
String bmiCategory;
if (bmi < 18.5) {
  bmiCategory = 'Underweight';
} else if (bmi >= 18.5 && bmi < 24.9) {
  bmiCategory = 'Normal Weight';
} else if (bmi >= 24.9 && bmi < 29.9) {
  bmiCategory = 'Overweight';
} else {
  bmiCategory = 'Obese';
}

// Set the BMI result
setState(() {
  bmiResult = 'Your BMI: ${bmi.toStringAsFixed(2)}\nCategory: $bmiCategory';
});

}
}