[Solved] Why sort() function causes compilation error when it is used for set of class objects

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Two problems. First, you cannot reorder the elements of a set. Their ordering criteria is determined upon construction, it is a fundamental part of the object. This is necessary in order for it to achieve O(log n) lookups, insertions, and deletions, which is part of the promises of std::set. By default, it will use std::less<Edge>, … Read more

[Solved] How will C parse this sentence? [closed]

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It is parsed as: b = (a++)++ + a; This is an invalid expression. The increment operator can’t be applied twice as (a++) isn’t an lvalue. The tokenizer isn’t context-aware and will match the longest token possible, so it is not parsed as the syntactically valid a++ + ++a. (That still would be invalid code, … Read more

[Solved] Can somebody help me understand “for” functions?

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An easy way to understand how loops work in any programming language is to follow, step by step what it is doing. Here a simple example of how you can “debug” in paper. This could be useful in the future. The table below represents each iteration of your loops and the values of each operation. … Read more

[Solved] Hash collision in Hashmap

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You could create your own type and create a bad hash function: public class BadHash { private String aString; public BadHash(String s) { aString = s; } public int hashCode() { return aString.length(); } public boolean equals(Object other) { // boilerplate stuff BadHash obj = (BadHash) other; return obj.aString.equals(aString); } } This will make it … Read more

[Solved] Encrypting the password using salt in c# [closed]

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(As suggested, I’ve replaced my previous salt generation method with something that should be more secure) To generate a random salt: public static string GenerateRandomSalt(RNGCryptoServiceProvider rng, int size) { var bytes = new Byte[size]; rng.GetBytes(bytes); return Convert.ToBase64String(bytes); } var rng = new RNGCryptoServiceProvider(); var salt1 = GenerateRandomSalt(rng, 16); var salt2 = GenerateRandomSalt(rng, 16); // etc. … Read more

[Solved] Which methods are changed in migrating wicket from 1.3.6 to 1.4.0?

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use getDefaultModelObject() instead Wicket usually provides a migration guide: https://cwiki.apache.org/WICKET/migrating-to-wicket-14.html#MigratingtoWicket1.4-Component.getModel%2528%2529andfriendsrenamedtogetDefaultModel%2528%2529andfriends BTW: wicket 1.5 is also already out 1 solved Which methods are changed in migrating wicket from 1.3.6 to 1.4.0?

[Solved] PHP cant connect to MySql (MySqli)

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<?php $sql = new mysqli(‘127.0.0.1′,’root’,’Qwert12345′,’plot_io_db’); //echo $sql->query(‘Select * From players’); ?> It will work. Just remove port from localhost (127.0.0.1) 0 solved PHP cant connect to MySql (MySqli)

[Solved] how do I dynamically toggle a button image using different font-awesome images? [closed]

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You can use simple boolean value in the component and *ngIf statement in HTML to show/hide necessary icon (or any other element), which will be based on that boolean value. You also need to add (click)=”isPlaying = !isPlaying” to that icons to trigger the state: HTML: <i class=”fa fa-play-circle” aria-hidden=”true” *ngIf=”!isPlaying” (click)=”isPlaying = !isPlaying”></i> <i … Read more

[Solved] Send/Receive byte[] via TCP Socket [closed]

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Use the Socket class. There is no Poll method, however there are other methods that can be used to check the socket status. For example, you can use Socket.isOutputShutdown() to check if the output stream is available (Whether it has been shutdown or not), and you can use Socket.getInputStream().available() to get the number of bytes … Read more