How to make flutter calculator [closed]

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Title: Flutter Calculator Layout Issue - Buttons Not Displaying Correctly

Description:

I'm building a calculator app in Flutter and facing layout problems with the button grid. The calculator interface consists of a display area and a keyboard grid, but the buttons are not rendering properly.

• Tangentially Perpendicular: There's nothing in your question that we can answer. It's not clear whether the code in the answer you've posted is intended to be part if this question, or represents some sort of answer.

Answer 1

import 'package:flutter/material.dart';
void main() => runApp(MaterialApp(home: Calc()));
class Calc extends StatefulWidget {
 @override
 _CalcState createState() => _CalcState();
}
class _CalcState extends State<Calc> {
 String d = '0', o = '';
 double n1 = 0, n2 = 0;
 void p(String v) {
 setState(() {
 if (v == 'C') {
 d = '0'; o = ''; n1 = 0; n2 = 0;
 } else if (v == '=') {
 n2 = double.parse(d);
 if (o == '+') d = (n1 + n2).toString();
 if (o == '-') d = (n1 - n2).toString();
 if (o == ×ばつ') d = (n1 * n2).toString();
 if (o == '÷') d = (n1 / n2).toString();
 o = '';
 } else if (['+', '-', ×ばつ', '÷'].contains(v)) {
 n1 = double.parse(d);
 o = v;
 d = '0';
 } else {
 d = d == '0' ? v : d + v;
 }
 });
 }
 Widget b(String t) => Expanded(
 child: Padding(
 padding: EdgeInsets.all(4),
 child: ElevatedButton(
 onPressed: () => p(t),
 child: Text(t, style: TextStyle(fontSize: 24)),
 style: ElevatedButton.styleFrom(padding: EdgeInsets.all(20)),
 ),
 ),
 );
 @override
 Widget build(BuildContext context) => Scaffold(
 appBar: AppBar(title: Text('Калькулятор')),
 body: Column(
 children: [
 Expanded(
 child: Container(
 alignment: Alignment.bottomRight,
 padding: EdgeInsets.all(24),
 child: Text(d, style: TextStyle(fontSize: 48)),
 ),
 ),
 Row(children: ['7', '8', '9', '÷'].map(b).toList()),
 Row(children: ['4', '5', '6', ×ばつ'].map(b).toList()),
 Row(children: ['1', '2', '3', '-'].map(b).toList()),
 Row(children: ['C', '0', '=', '+'].map(b).toList()),
 ],
 ),
 );
}

• Md. Yeasin Sheikh: is this your question part that causing the issue?if so you can add this into the question & if not you can add trouble snippet into the question section