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C + + can use the const to define constants, or define constants using define #, which has more advantages than the latter.1) const data constants have data types, and macro constants do not have data types. The compiler can perform type safety checks on the former and only string substitution for the latter2) Some integrated debugging tools can debug const const

Three ways to define JavaScript classes (Class) Almost 20 years ago, when JavaScript was born, it was just a simple web scripting language. If you forget to fill in the user name, it jumps out a warning. Today, it becomes almost omnipotent, from the front-end to the back-end, with a variety of unthinkable uses. Programmers use it to accomplish larger and larger projects.The complexity of JavaScript code also rises linearly. A single page contains

Span this label, presumably everyone is familiar with it, but it is very difficult to use, especially when you need to define the width and height of the time Making HTML pages often uses the tag of span, but some friends don't use the tag very well, and seem to think it's good, but it's a hassle to use, especially when it comes to defining width and height.once a friend asked: Why to use CSS to define the

"#define"#define是预处理指令, a simple substitution is made during the pre-processing of the compilation without checking for correctness."typedef"A typedef is simply a new name for the identifier to be added for readabilityGive an alias to an already existing type within its own scope. C + + Code 12345 typedef int *int_ptr;#define INT_PTR

In the JavaScript world, there are a variety of ways to define a function, which is the embodiment of javascript flexibility, but it is the reason for beginners to be confused, especially for students without language basis. Is the so-called road to Rome, but if too many roads, will let the road people at a loss, because do not know to go that road is the right way, oh, a big piece of nonsense, gossip less, first look at the code: Copy Code code

Use JavaScript to define the specification of a class as follows: Specify the class name and the constructor, and the class name (the constructor name) to capitalize the first letter: Copy Code code as follows: function YourClass () { } Use this. Member variable to define (pseudo) private members within its constructor, and the best convention (pseudo) Private members are made up

The difference between #define, const, typedef#define is not defining variables, it's just for text substitution.For example:#define PI 3.1415926float Angel;angel=30*pi/180;Then, when the program is compiled, the compiler will first "#define PI 3.1415926" after the "PI" in all the code is replaced by "3.1415926"and the

recently in reading the JavaScript Advanced Program design, is a bit forgotten to read the content, it is intended to do some reading in the form of blog notes. Today is about Four ways to define objects in JavaScript, in addition to these four methods, there are factory methods to define objects, but given their simplicity and informality, this is not an introduction. compared to object-oriented l

the small knowledge point:1. The difference between #include 1-#include compiler is a reference to the header file .2) #include "" refers to the header file in the relative path of your program directory and invokes the header file in the project directory.2.typedef and define what is the specific difference:(1) #define是preprocessing instructions , in the compilation of preprocessing to make a simple repla

Defining constants is very simple The method is: The code is as follows Copy Code {$smarty. Const. The constant name you define} How do you define a variable? Define variables in Smarty. {* The following paragraph is equivalent to defining a variable within the template username*} The code is as follows C

Pre-defined constants in PHP: __file__ The script file name that is currently being processed. If used in a contained file, its value is the included file, not the file name that contains it. __line__ The current number of rows for the file being processed. Php_version Represents the current version of the PHP processor, such as: ' 3.0.8-dev '. Php_os The operating system name of the PHP processor, such as: ' Linux '. TRUE Truth FALSE False value You can

Asp.net| Control Preface Asp. NET user control is very powerful, in the Web form to call to believe that everyone will, if you want to give the user control to define attributes, then how to do? As long as you finish this article, you will be able to make a few attributes on your control. This article is not very suitable for beginners. NET friend, involves some object-oriented knowledge, if you do not understand this knowledge, please refer to the r