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by: Matt |
last post by:
Greetings,
What are people's thoughts on global variables in C++?
Why are we taught not to use them in programming?
Is it true that if you are running two copies of the C program one
copy can overwrite another copies global variable?
I know that you could overwrite a value in a global variable from a
function, but you could also do that if you pass the variable in and
then out again... so how is that any different?
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by: lawrence |
last post by:
I'm learning Javascript. I downloaded a script for study. Please tell
me how the variable "loop" can have scope in the first function when
it is altered in the second function? It is not defined in global
space, therefore it is not a global variable, yes? Even if it was
global, how would it get from one function to another? In PHP
variables are copied by value. Are they copied by reference in
Javascript?
<SCRIPT LANGUAGE="JavaScript">
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by: MLH |
last post by:
A97 Topic: If there is a way to preserve the values assigned to
global variables when an untrapped runtime error occurs? I don't
think there is, but I thought I'd ask.
During development, I'm constantly running tests on imperfect code.
On of the cumbersome jobs encountered is reassigning global vars
their values after a close encounter with an untrapped runtime error.
Rather than writing a procedure to simply reassign them all with a...
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by: Fernan Bolando |
last post by:
I have been going through some of the tutorials on the internet
regarding coding styles in unix C programming. Most of the stuff I have
read do not prefer using global variables, But for multi-file programs
it is impossible not to have global variables.
I am trying to learn of the best way to check if I am mis-using global
variables. How do you guys know if there are to many global variables in
your programs? I am not trying to start a...
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by: Michael |
last post by:
Hi newsgroup,
as the subject indicates I am looking for an advice
using global variables. I am not if this problem is more
about style then C. If its wrong in thi group, sorry.
So I have a couple of function that all need the same
information (all located in the same file). By now it looks like
/* file beginns */
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by: Woody Splawn |
last post by:
I am finding that time after time I have instances where I need to access
information in a variable that is public. At the same time, the books I
read say that one should not use public variables too much - that it's bad
programming practice. Is there an easy way to deal with this? I would like
to do things in the "Best Practices" way but at the same time I don't want
to make a federal case out of it.
This comes up over and over...
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by: zeecanvas |
last post by:
Hi,
First of all: Yes, I know global variables are bad, but I've a huge
amount of legacy code, and I've to maintain it _as_is_.
I'm maintaining a big program. I moved all (program-wide scope) global
variables outside of the files they were defined it, and created some
files that just hold global variables definitions (just variables,
without any function definition). So, depending on the purpose/category
of variables, they're defined...
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by: CDMAPoster |
last post by:
About a year ago there was a thread about the use of global variables
in A97:
http://groups.google.com/group/comp.databases.ms-access/browse_frm/thread/fedc837a5aeb6157
Best Practices by Kang Su Gatlin, casual mention was made about using
static variables as an alternative to using global variables. This
caused me to think of the following:
'-----Begin module code
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by: Sandman |
last post by:
I dont think I understand them. I've read the section on scope in the
manual inside out.
I'm running PHP 5.2.0 Here is the code I'm working on:
//include_me.php
<?php
$MYVAR = array();
global $MYVAR, $a;
?>
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by: weaknessforcats |
last post by:
C++: The Case Against Global Variables
Summary
This article explores the negative ramifications of using global variables. The use of global variables is such a problem that C++ architects have called it polluting the global namespace. This article explores what happens when the global namespace becomes polluted and how to avoid this condition.
The opinions expressed in this article are those of the author alone although many have...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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