dart

问题 What is the correct way to perform this operation? 399.9 / 100 What I would expect to see is 3.999 but the result is 3.9989999999999997 回答1: The result you see is correct , it's just not what you want. Doubles are not precise values. The double you get by writing 399.9 is actually the precise value. 399.8999999999999772626324556767940521240234375 That's the closest available double to the exact value 399.9. Any other double is at least as far away from 399.9 as that. Then you divide by 100.

问题 What is the correct way to perform this operation? 399.9 / 100 What I would expect to see is 3.999 but the result is 3.9989999999999997 回答1: The result you see is correct , it's just not what you want. Doubles are not precise values. The double you get by writing 399.9 is actually the precise value. 399.8999999999999772626324556767940521240234375 That's the closest available double to the exact value 399.9. Any other double is at least as far away from 399.9 as that. Then you divide by 100.

问题 What is the correct way to perform this operation? 399.9 / 100 What I would expect to see is 3.999 but the result is 3.9989999999999997 回答1: The result you see is correct , it's just not what you want. Doubles are not precise values. The double you get by writing 399.9 is actually the precise value. 399.8999999999999772626324556767940521240234375 That's the closest available double to the exact value 399.9. Any other double is at least as far away from 399.9 as that. Then you divide by 100.

问题 What is the correct way to perform this operation? 399.9 / 100 What I would expect to see is 3.999 but the result is 3.9989999999999997 回答1: The result you see is correct , it's just not what you want. Doubles are not precise values. The double you get by writing 399.9 is actually the precise value. 399.8999999999999772626324556767940521240234375 That's the closest available double to the exact value 399.9. Any other double is at least as far away from 399.9 as that. Then you divide by 100.

问题 How could I achieve this layout in Flutter? 回答1: I published package drop_cap_text to achive DropCapText, you can also put an image as custom widget inside DropCap. 回答2: its Pretty basic just simple Row with the data inside it Row( mainAxisAlignment: MainAxisAlignment.start, children: <Widget>[ Image.asset('Your image link here'), Text('you paragraph here') ],) 回答3: You can use Stack(): https://flutter.io/docs/development/ui/layout#stack class _MyHomePageState extends State<MyHomePage> {

问题 How could I achieve this layout in Flutter? 回答1: I published package drop_cap_text to achive DropCapText, you can also put an image as custom widget inside DropCap. 回答2: its Pretty basic just simple Row with the data inside it Row( mainAxisAlignment: MainAxisAlignment.start, children: <Widget>[ Image.asset('Your image link here'), Text('you paragraph here') ],) 回答3: You can use Stack(): https://flutter.io/docs/development/ui/layout#stack class _MyHomePageState extends State<MyHomePage> {

问题 How could I achieve this layout in Flutter? 回答1: I published package drop_cap_text to achive DropCapText, you can also put an image as custom widget inside DropCap. 回答2: its Pretty basic just simple Row with the data inside it Row( mainAxisAlignment: MainAxisAlignment.start, children: <Widget>[ Image.asset('Your image link here'), Text('you paragraph here') ],) 回答3: You can use Stack(): https://flutter.io/docs/development/ui/layout#stack class _MyHomePageState extends State<MyHomePage> {

问题 How could I achieve this layout in Flutter? 回答1: I published package drop_cap_text to achive DropCapText, you can also put an image as custom widget inside DropCap. 回答2: its Pretty basic just simple Row with the data inside it Row( mainAxisAlignment: MainAxisAlignment.start, children: <Widget>[ Image.asset('Your image link here'), Text('you paragraph here') ],) 回答3: You can use Stack(): https://flutter.io/docs/development/ui/layout#stack class _MyHomePageState extends State<MyHomePage> {

问题 On the system: Dart VM version: 2.9.0-14.0.dev.flutter-2b917f5b6a (be) (Wed Jun 10 15:46:47 2020 +0000) on "windows_x64" It is OK when run "aqueduct db generate" to create 00000001_initial.migration.dart But, after edit models and rerun "aqueduct db generate", I get the message as below. After delete 00000001_initial.migration.dart and rerun, it is OK. The message: -- Aqueduct CLI Version: 3.3.0+1 -- Aqueduct project version: 3.2.0 *** Uncaught error Bad state: NoSuchMethodError: The getter

问题 I have double value double myNum = 110700.00; I want to modify it's format using NumberFormat 110 700 How it can be done? 回答1: You can't do it without changing locale because GROUP_SEP is final. However, if you don't mind changing locale, which you can do on any particular instance, for example with new NumberFormat('###,000', 'fr') then pick any locale (e.g. French) which uses non-breaking space as the GROUP_SEP. Of course, you then end up with , as your decimal separator but if you don't