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From: Http://stackoverflow.com/questions/2447791/define-vs-constSame point: Both can define constantsConst foo = ' Bar ';d efind (' foo ', ' Bar ');The disadvantage of const:1.const must be declared in Top-level-scope (top-level domain):For example:

Recently, I have discussed a number of topics in group C #'s fast-growing team. I would like to share my summary with you.Of course, the focus of the so-called topic is to discuss whether it is the best practice or not. If there are any mistakes in

As we all know, PHP is a weak language. You do not need to define the variable before using it, and do not need to declare the data type of the variable. This brings a lot of convenience in programming, but it also brings some hidden risks,

Const detail in C + +From http://blog.csdn.net/lwbeyond/article/details/6187501I. The role of cons(1) const constants can be defined const int max=100; int Array[max]; (2) Can protect the modified things, prevent accidental

Python built-in constants and python Constants IntroductionThere are not many built-in constants in Python. There are only six constants: True, False, None, NotImplemented, Ellipsis, and _ debug __.1. True1. True is a constant of the bool type used

Const To put it simply, const represents a read-only variable in c language and a constant in c ++ language. C Language Const is the abbreviation of constant. It means constant and is also translated as a constant. However, many people think that

JVM memory consists of several parts: heap, Method area, stack, program counter, local method stackJVM garbage collection is only done for public memory areas, that is, the heap and the method area, because only those two zones will be aware of the

In MFC programs, using CString to process strings is a good choice. CString can handle both Unicode-standard strings and ANSI-standard strings. The format method of CString gives us a lot of convenience in converting strings, such as common int,

The global variables in PHP are a little different from those in C language. In C language, global variables take effect automatically in the function unless they are overwritten by local variables, which may cause some problems, some may carelessly

This may cause some problems. Some may carelessly change a global variable. Global variables in PHP must be declared as Global when used in functions (note that the Global keyword is useful in function definition ).1: Global is used to define Global

The Java bytecode we see is encapsulated in a class file with the extension. class. In this tutorial, let's look at the internal structure of the class file.How the data is written to the class file and the format of the class file, let's start with

Difference between global and $ GLOBALS in php. Some friends say that these two are actually differences in writing. let me prove the difference between global and $ GLOBALS. if you need them, please refer to them for details. According to the

In a namespace, when PHP encounters an unqualified class, function, or constant name, it uses a different precedence policy to resolve the name. The class name always resolves to the name in the current namespace. Therefore, you must use a fully

Namespaces are used to resolve a conflict between the user-written code and the name of a class/function/constant or third-party class/function/constant within PHP. Create an alias (or short) name for a long identifier name to improve the

In this article, we provide some specific solutions to the problems with the PHPGlobal variable, if you are interested, you can refer to the ha php Global variable. in actual application, we will find many problems that need to be constantly

PHP defines the array constant (array constant) method, array constant. PHP defines the array constant (array constant) method. in PHP, we cannot use const to directly define the array constant, but const can define the string constant, combined

This article mainly introduces PHP path_separator to determine the current server system type instance of the relevant information, the need for friends can refer to the following PHP has a very useful pre-defined constant, path_separator, which

1) Can I create a volatile array in Java?Yes, you can create an array of volatile types in Java, but only a reference to an array, not an entire array. I mean, if you change the array that the reference points to, it will be protected by volatile,

re-developer of labor results, reproduced when please be sure to indicate the source : http://blog.csdn.net/haomengzhu/article/details/27689713Shimen Main Friendship tips:Man is the product of habit, when you are accustomed to happiness. The

This is a constant in Discuz that defines the forum installation root directory. Now let's analyze this simple but very practical constant. Define (' Discuz_root ', substr (DirName (__file__), 0,-7));This is a constant in Discuz that defines the