126 questions
4
votes
0
answers
45
views
Why does using 'this' in a Java instance initializer block resolve forward reference errors? [duplicate]
Problem Description
I've encountered an interesting behavior in Java regarding forward references in instance initializer blocks. When I try to access an instance variable directly, I get a forward ...
- 515
-3
votes
1
answer
169
views
Creating custom keywords in C++ using libraries [closed]
I want to create a keyword that modifies a variable during definition. Similar to how long long var; creates something different than long var;, or static int var; does something special to the ...
- 115
-1
votes
3
answers
176
views
Is this an elegant way to initialize a variable for the first iteration of a loop? [closed]
This is a C program that copies its input to its output, replacing each string of one or more blanks by a single blank. I don't know what is the best way to proceed when the program starts and there ...
0
votes
2
answers
133
views
C - ternary operator in initialization statement of a for-loop
I am quite new to C and preparing for a test by working through some sample questions.
Given the code below, I don't understand the initialization of int j by using the ternary operator.
for (int j = ...
1
vote
2
answers
789
views
Why Does PowerShell Complain It Can't Retrieve a Variable?
I'm getting the following error message:
The variable '$dateTime' cannot be retrieved because it has not been set.
The error is generated by the line [DateTime]$dateTime in this code:
[string]$...
- 666
0
votes
1
answer
352
views
how to interpolate workflow level variable into another workflow level variable github actions
I'm new to github actions.
Below is my workflow:
name: Example
on: [push, workflow_dispatch]
env:
APPNAME: 'myapp1'
APPURL: "https://mybank/$APPNAME/widgets/hello.json"
jobs:
test:
...
- 3,225
0
votes
2
answers
119
views
Variable initialization in Javascript
There is something that I couldn't understand. I have the following code, which its purpose is to get the total of the two arrays.
let r1;
let r2;
let total;
function totalSum(arr_1, arr_2) {
...
0
votes
0
answers
59
views
Concept issues about initializing avariable in C++ class
I'm translating a script form matlab to C++ and I'm given a code snipet in c++ so I can fill it. My BIG issue is that my knowledge about C++ is almost nothing, I know how classes work in a basic way ...
- 33
1
vote
1
answer
67
views
Is there a way in Java to make labels move without user influence?
I am trying to develop an application where the user moves a can back and forth on the bottom of the screen to try to catch bees as they fall. I have successfullly gotten the can movement working, but ...
- 13
0
votes
1
answer
52
views
Why does initialising the variable outside the event handler and then reassigning it only allow the code to work once?
I'm making a BMI calculator and it works only one time. Which I don't understand. I initialised 2 let variables outside the click event handler just to get the input elements. When I wanted to convert ...
- 1
0
votes
1
answer
472
views
Detect and prevent processing of sequential duplicate Tradingview webhook json
I am not very well acquainted with python, but have by much trial and error, and building upon the work of others, developed a simple working and reliable interface between Tradingview (TV) and ...
- 11
0
votes
2
answers
820
views
Why can't a global variable be initialised from another global?
int a = 5;
int b = a; //error, a is not a constant expression
int main(void)
{
static int c = a; //error, a is not a constant expression
int d = a; //okay, a don't have to be a constant ...
- 11
1
vote
1
answer
225
views
Why is Java forcing me to initialize my String before letting the user input the value of the String?
I'm essentially making a small, simply "twenty questions" style program, using nested if-statements to try to guess what object the user is thinking based on clarifying questions.
I'm using ...
- 23
2
votes
1
answer
153
views
What's the difference between Radio r = Radio("PSR", 100.8) and Radio("PSR", 100.8)? [duplicate]
I'm new to C++ and trying to understand something. I have this code in my main.cpp:
Radio r = Radio("PSR", 100.8);
or that code:
Radio r("PSR", 100.8);
Both seem to work and ...
- 35
0
votes
2
answers
1k
views
Is there a reason to use zero-initialization instead of simply not defining a variable when it is going to be updated before the value is used anyway?
I came across a code example learncpp.com where they zero-initialized a variable, then defined it with std::cin:
#include <iostream> // for std::cout and std::cin
int main()
{
std::cout &...
