Why are there defined constants and declared constants in CPP?

Posted by Itay Moav on Stack Overflow See other posts from Stack Overflow or by Itay Moav
Published on 2010-04-20T21:43:02Z Indexed on 2010/04/20 21:53 UTC
Read the original article Hit count: 325

Filed under:

cpp

|

const

|

constants

|

best-practices

Why are there two ways to "declare" constants in CPP?
Which is better, or should I write, which of them should I use when?

#define MYCON 100
const int MYCON=100

© Stack Overflow or respective owner

Related posts about cpp

encfs error while decoding the data

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have installed encfs and started using it to secure all my personal & office data and it was working absolutely fine until 2 hours back. The setup is like this. I have a folder in Copy folder called OfficeData which gets synchronized with my Copy folder When I login into the system I use… >>> More
Use synergy with Physical KVM

as seen on Super User - Search for 'Super User'
I am using synergy on a Linux Mint computer as the server with a Mac as the client. I also have a physical KVM switch. The problem I have is that when ever I switch the physical KVM to my Mac, synergy stops working as in the keyboard and mouse don't work with the Mac. Thanks in advance! EDIT:… >>> More
Qt Linking Error.

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I configure qt-x11 with following options ./configure -prefix /iTalk/qtx11 -prefix-install -bindir /iTalk/qtx11-install/bin -libdir /iTalk/qtx11-install/lib -docdir /iTalk/qtx11-install/doc -headerdir /iTalk/qtx11-install/include -datadir /iTalk/qtx11-install/data -examplesdir /iTalk/qtx11-install/examples… >>> More
Compiling OpenCV in Android NDK

as seen on Stack Overflow - Search for 'Stack Overflow'
PLEASE SEE THE ADDITIONS AT THE BOTTOM! The first problem is solved in Linux, not under Windows and Cygwin yet, but there is a new problem. Please see below! I am currently trying to compile OpenCV for Android NDK so that I can use it in my apps. For this I tried to follow this guide: http://www… >>> More
A Linker Resolution Problem in a C++ Program

as seen on Stack Overflow - Search for 'Stack Overflow'
We have two source files, a.cpp and b.cpp and a header file named constructions.h. We define a simple C++ class with the same name (class M, for instance) in each source file, respectively. The file a.cpp looks like this: #include "iostream" #include "constructions.h" class M { int … >>> More

Related posts about const

what is the difference between const int*, const int * const, int const *

as seen on Stack Overflow - Search for 'Stack Overflow'
I always mess up how to use it correctly. Is there a set of rules defining what you can and cannot do? I want to know all the Do's and all DoNOTs in terms of assignments, passing to the functions, etc. Thanks >>> More
Modifying a const through a non-const pointer

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm a bit confused what happened in the following code: const int e = 2; int* w = ( int* ) &e; // (1) cast to remove const-ness *w = 5; // (2) cout << *w << endl; // (3) outputs 5 cout << e << endl; // (4) outputs 2 cout… >>> More
What is the best Broadphase Interface for moving spheres?

as seen on Game Development - Search for 'Game Development'
As of now I am working on optimizing the performance of the physics and collision, and as of now I am having some slowdowns on my other computers from my main. I have well over 3000 btSphereShape Rigidbodies and 2/3 of them do not move at all, but I am noticing(by the profile below) that collision… >>> More
Template inheritence c++

as seen on Stack Overflow - Search for 'Stack Overflow'
I have made a template singleton class, I have also made a data structure that is templated. My question is; how do I make my templated data structure inherit from a singleton so you can only have one float type of this structure? I have tested both seperate and have found no problems. Code provided… >>> More
Higher order function « filter » in C++

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all. I wanted to write a higher order function filter with C++. The code I have come up with so far is as follows: #include <iostream> #include <string> #include <functional> #include <algorithm> #include <vector> #include <list> #include <iterator> using… >>> More