I am currently going through and linting a lot of old code at a company that has been around a while. We have recently been having issues with uninitialized C++ members having garbage data, which is one reason for the housekeeping. Unfortunately with all the updates to C++ over the years there are a few… Read More Question on odd use of brace initializers for arrays in C++

I know the System.in.read() method doesn’t have much use, but I’m confused as to why it has to be in the while statement for the following code to work. I’m trying to take character input from the method and add it to a string. When the enter key is pressed, it stops taking input and… Read More Why does this code only work properly if the method is in a while loop condition? (Java)

I have this Problem when I start my Backend, I want to test the post request in Postmann but I have this error, how can I fix it? this is my Server . j s >Solution : The app variable is used before you declare it. Move your const app = express(); upward. Like this:… Read More ReferenceError: Cannot access 'app' before initialization

I am very new to C++ and I am wondering if I can do the following, int a =5; int b[a]; If so, what would happen if value of a changed? and any drawback using this. If not,why it that? thanks! I tried the same code on an online c++ compiler and it does work.… Read More A quick c++ array initialization question using non const variable

Is it possible to initialize a swift struct without any values? To summarize the idea, I’m creating a struct with two attributes, those attributes were filled when I called the init() method, as it should, but the problem is, I have a function inside this struct and I need to use it, in some cases,… Read More Empty initializer for swift structures

I have faced with a strange behavior in c#. I created a int[][] array like this: int[][] m_dist = Enumerable.Repeat(Enumerable.Repeat(-1, m.Length).ToArray(), m.Length).ToArray(); Array looks like this: -1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1, Later on when I tried to modify a single array element I was supraised because not only one item was changed but a… Read More Why the indexing affects a complete array instead of one item ? (c#)

Let’s say I have a function that returns an object: public object toto() {} Or in python: def toto(): return "something" I want to initialize a list of n elements in a very simple way, in Python I would do: l = [toto() for i in range(1, n+1)] Is there a simple, similar way, of… Read More Can I initialize a list from an expression in a simple way, similar to Python?

I’m trying to make a Discord bot, one of its features is that it plays chess, at the start of the command, I read the JSON file, then check if it’s undefined since I’ll call a key from the object, so just in case it doesn’t exist already, I’ll create the data needed Problem is,… Read More Variable throws initialization error after initializing it

I want to declare acceptable_set and use it. But an empty vector is assigned to it. So the compiler warns. How to declare a variable and do not assign it? let mut acceptable_set: Vec<String> = Vec::new(); if opt.acceptable_set.is_none() { acceptable_set = crate::builtin_words::ACCEPTABLE .to_vec() .iter_mut() .map(|x| x.to_string()) .collect(); } else { acceptable_set = get_acceptable_set(opt) } warning:… Read More How to declare a variable but not assign it?

How to properly initialize a struct in Rust, with good enough encapsulations? Or more naively: how to leverage object/instance methods in the initialization/constructing process of structs? For example, as the initialization block in Kotlin: private class BinaryIndexedTree(nums: IntArray) { private val nNums = nums.size private val fenwick = IntArray(nNums + 1) { 0 } //… Read More How to properly initialize a struct in Rust, with good enough encapsulations?