Kirat[ad_1] You do not set next when you create your Nodes, so next is always null. This Node(final Object element, Node prevNode) { this.element = element; prevNode = this; } should be Node(final Object element, Node prevNode) { this.element = element; prevNode.next = this; } [ad_2] solved Erorr with the nullpointer
[ad_1] You should not use external files for this purpose, as they are not secure. Android recommends Shared Preferences for this purpose. Shared Preferences store data in the your app package in an xml file which is only accessible through your app. Data is stored in Key-Value pairs. To save data: SharedPreferences prefs = this.getSharedPreferences( … Read more
[ad_1] I want to compare coming get variable with nursery But then you are comparing with Nursery if ($results==”Nursery”) Are you aware that that comparison is case-sensitive? Also that code is poor. It should simply be $results=isset($_GET[‘results’]) ? $_GET[‘results’] : NULL; Do not use error suppression when you are learning something new. And Oh, How … Read more
[ad_1] Why here the output is only “hie” and “hola”? Order of precedence of Logical AND (&&) is greater than Logical OR (||). Agreed. But, it doesn’t mean that a program has to evaluate in that order. It just says to group together the expressions. Hence, if(printf(“hie”)|| printf(“hello”)&& printf(“nice to see you”)) is equivalent to, … Read more
[ad_1] You should remove the line-height:170%; and it should work. 1 [ad_2] solved I need to control the vertical Spacing between DIVs? [closed]
[ad_1] You need to instantiate the Lists in your AddedContacts class’s constructor: public class AddedContacts { private List<CreateContact> Contact; public List<CreateContact> ClassCreateContact { get { return Contact; } set { this.Contact = value; } } public AddedContacts() { Contact = new List<CreateContact>(); ClassCreateContact = new List<CreateContact>(); } } You also need to create an instance … Read more
[ad_1] select * from tbl_Service where sId not in (select ser_Id from tbl_quat_ID where quat_Id != <qID>) i hope qID is passed from application side.. you just need to append the string to pass proper value there 1 [ad_2] solved SQL JOIN for three tables
[ad_1] You should take a look at the mysql manual to learn about creating databases/tables: Create Table Syntax there are also examples of how to create tables. Edit: you can do either: INSERT INTO recipe (name, category) VALUES (‘Recipename’, ‘Categoryname’); since you only specify the columns where you want to add data or INSERT INTO … Read more
[ad_1] You are storing the dates in the SQL database as text strings, but then asking SQL to return values between to limits and expecting it to interpret those limits as dates when it hasn’t been told that they are dates and wouldn’t know how to interpret the text format as a date if it … Read more
[ad_1] The problem is you have two separate tasks running that call ShowProgressText. Task.Run() is not something you normally use unless you are interfacing with code that does not use the C# async/await pattern. So perhaps LoadRapport could be like this: bool IsCompleted; string LogText; private async Task LoadRapport() { LogText = “Disable Replication”; IsCompleted … Read more
[ad_1] A few foolish minutes later; I have worked out an answer I believe sufficient: a = abs( LAT-chosen_lat ) + abs( LONG-chosen_lon ) i,j = np_unravel_index(a.argmin(), a.shape) [ad_2] solved find (i,j) location of closest (long,lat) values in a 2D array [closed]
[ad_1] We could first group_by country and then use summarise with across library(dplyr) df %>% group_by(country) %>% summarise(across(everything(), sum)) Output: country new_persons_vac~ total_persons_v~ new_persons_ful~ total_persons_f~ new_vaccine_dos~ total_vaccine_d~ <chr> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> 1 Afghan~ 294056 8452317 163535 2313338 457591 10765655 2 Albania 601152 27639676 465433 18105836 459226 45745512 3 Andorra 40569 360995 25838 … Read more
[ad_1] Found the Solution using FutureBuilder class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State<MyApp> { _load() async { final file = await rootBundle.loadString(‘assets/j.json’); final data = await jsonDecode(file); print(data.toString()); } @override Widget build(BuildContext context) { return FutureBuilder( future: _load(), builder: (_, AsyncSnapshot<dynamic> snapshot) { return !snapshot.hasData ? Container( … Read more
[ad_1] The yield and yield* keywords can only be used directly inside a generator function. Your code fragment is conceptually flawed in a similar manner to: function f1() { if(someCondition) { f2((value) => { else { // do something } }); } } or, to this: function f1() { f2((value) => { return someValue; // … Read more
[ad_1] Don’t use Marshal::StringToHGlobalUni in C++/CLI. Use either PtrToStringChars (accesses Unicode characters in-place, no allocation) or marshal_as<std::wstring> (manages the allocation with a smart pointer class that will free it correctly and automatically) Apart from the fact that StringToHGlobalUni requires you to free the memory manually, the name of that function is completely misleading. It has … Read more