samar.dart

import 'package:flutter/material.dart';
void main() {
  runApp(new HelloWorld());
}
class HelloWorld extends StatefulWidget {
  @override
  _HelloWorldState createState() => _HelloWorldState();
}
class _HelloWorldState extends State<HelloWorld> {

  String message = "Guess The Number";
   
  
  void calculateResult (int guessNumber)
  {
    setState((){
    this.message = "my number is higher";
    });
    
  }
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Hello World Example'),
        ),
        body:Center (
        child:Column (
        children:[
           Text (
         ""
          ),
          Text (
      "$message"
          ),
          FlatButton(
                        color: Colors.black,
                        textColor:Colors.lightGreenAccent,
                        onPressed: () {
                      calculateResult(1);
                        },
                        child: Text(
                          "1",
                          style: TextStyle(fontSize: 22.0),
                        ),
                      ),
                 FlatButton(
                        color: Colors.black,
                        textColor:Colors.lightGreenAccent,
                        onPressed: () {
                          calculateResult(2);
                        },
                        child: Text(
                          "2",
                          style: TextStyle(fontSize: 22.0),
                        ),
                      ),
                       FlatButton(
                        color: Colors.black,
                        textColor:Colors.lightGreenAccent,
                        onPressed: () {
                        calculateResult(3);
                        },
                        child: Text(
                          "3",
                          style: TextStyle(fontSize: 22.0),
                        ),
                      ),
          
        ]
        ),
          ),
          
      ),
    );
  }
}