大佬教程收集整理的这篇文章主要介绍了如何在计算器应用程序中添加基本功能?比如加法减法,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
有人可以帮我向我的计算器应用程序添加功能吗?好吧,我已经完成了其中的所有事情,唯一剩下的就是添加计算操作。当用户输入某些内容时,我对如何使计算操作工作感到有些困惑,请帮助我!这将是我的第一个应用程序...代码如下
import 'package:calculator/constants/constants.dart';
import 'package:Flutter/material.dart';
import 'package:Flutter/services.dart';
voID main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This Widget is the root of your application.
@overrIDe
Widget build(BuildContext context) {
return MaterialApp(
title: 'Calculator',theme: themeData(
priMarySwatch: colors.blue,),home: MyHomePage(),deBUGShowcheckedModeBAnner: false,);
}
}
class MyHomePage extends StatefulWidget {
@overrIDe
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var question = "0";
var answer1 = "0";
var result = "";
/* String _privateOutput = "0"; */
/* double num1 = 0.0;
double num2 = 0.0;
String task = ""; */
Widget calculatorbutton(String numberText) {
return Expanded(
child: Materialbutton(
onpressed: () {
setState(() {
if (question == "0") {
question = numberText;
} else {
question += numberText;
}
});
},padding: EdgeInsets.all(24),child: Text(
numberText,style: kCalculatorStyle,);
}
Widget calculatorbuttonSymbols(String text) {
return Expanded(
child: Materialbutton(
onpressed: () {
setState(() {
if (text == "÷" || text == "×" || text == "+" || text == "-") {
} else if (text == "=") {}
});
},child: Text(
text,style: kCalculatorStyleSymbols,);
}
Widget calculatorbuttontopSymbols(String text) {
return Expanded(
child: Materialbutton(
onpressed: () {
setState(() {
if (text == "AC") {
question = "0";
} else if (text == "±" || text == "%") {
question += text;
}
});
},style: kCalculatorStyleSymbols1,);
}
Widget calculatorresetbutton(IconData icon) {
return Expanded(
child: Materialbutton(
onpressed: () {
setState(() {
if (icon == Icons.arrow_BACk) {
question = question.subString(0,question.length - 1);
}
if (question == "") {
question = "0";
}
});
},child: Icon(
icon,size: 30,);
}
@overrIDe
Widget build(BuildContext context) {
SystemChrome.setsystemUIOverlayStyle(
systemUIOverlayStyle(
statusbarcolor: colors.transparent,systemNavigationbarcolor: colors.transparent,statusbarIconBrightness: Brightness.dark,systemNavigationbarIconBrightness: Brightness.dark,);
return Scaffold(
BACkgroundcolor: colors.white,body: Container(
child: column(
children: [
SafeArea(
child: Container(
alignment: Alignment.centerRight,padding: EdgeInsets.all(20),child: Text(
question,Expanded(child: divIDer()),column(
children: [
Row(
children: [
calculatorbuttontopSymbols('AC'),calculatorbuttontopSymbols('±'),calculatorbuttontopSymbols('%'),calculatorbuttonSymbols('÷'),],Row(
children: [
calculatorbutton('7'),calculatorbutton('8'),calculatorbutton('9'),calculatorbuttonSymbols('×'),Row(
children: [
calculatorbutton('4'),calculatorbutton('5'),calculatorbutton('6'),calculatorbuttonSymbols('-'),Row(
children: [
calculatorbutton('1'),calculatorbutton('2'),calculatorbutton('3'),calculatorbuttonSymbols('+'),Row(
children: [
calculatorresetbutton(Icons.arrow_BACk),calculatorbutton('0'),calculatorbutton('.'),calculatorbuttonSymbols('='),);
}
}
看看这个Convert several YAML files to CSV。你可以从这里得到想法。
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