how to use define

Preprocessor commands are very powerful and are used extensively during programming, such as easy to use in version release, 1, #define (tells the compiler that there is a symbol for the given name) #undefine (delete symbol) 2,

As you know, in C, we can use # define a macro name to determine whether the header file needs to be referenced by checking whether the macro name is defined. There are similar problems in PHP, such as: A refers to B,c, b refers to C, and if no

Usage Environment: You can use define to define constants in PHP, but you cannot use define in a class, and in a class, the values of some properties do not want to be modified, and we need to use Const to define constants. How to use: 1, the

Constants are a very new data type in php. I will introduce some usage of PHP constants in detail for beginners. if you need to know them, refer to the PHP constant define () function. Constants are a very new data type in php. I will introduce some

What do we often do with define? 1) define a constant 2) define a macro Why do not use define. The following two aspects are explained: 1) when we define a constant, we can use the following method: # Define aspect_patio 1.653 We know

Reading Notes _ positive tive C ++ _ habits C ++, Reading Notes _ positive This is a very classic C ++ book, and I often use it for charging when I find many weak points in C ++ at work. This book has a lot of content and tells you a lot about how

// ================================================ ========================================// Title:// How to Write elegant code (2) -- # define? Const? Or enum?// Author:// Norains// Date:/// Tuesday 21-July-2009// Environment:// Wince5.0 + vs2005/

Although vdsp and gcc3.2 have good compatibility, there are still some differences. The following lists some differences and solutions: 1 , _ Builtin_exact CT (exp, Val) :This is a built-in function of GCC, and vdsp does not have this function. It

use define () unless you consider readability, class constants, or focus on micro-optimizations In PHP, it is customary to use the Define () function to define constants. But starting at some point, PHP can also use the const keyword to declare

Basic connectionFirst, create Express project TestmonExpress TestmonSecond, streamline App.jsvar express = Require ("Express"); var app = Express (); App.get (function(req, res) { res.send (' Add one piece of data at a time ') ; }); var server =

Shortcut:===============================================================================Edit/undo Ctrl + ZEdit/redo shift+ctrl+zEdit/pl/sql beautifier ctrl+w (Custom)Shift+home Selecting the cursor position to the beginning of the lineShift+end

Shortcut:=====================================================================Edit/undo Ctrl + ZEdit/redo shift+ctrl+zEdit/pl/sql beautifier ctrl+w (Custom) Shift+home Selecting the cursor position to the beginning of the lineShift+end Select the

Shortcut:===============================================================================Edit/undo Ctrl + ZEdit/redo shift+ctrl+zEdit/pl/sql beautifier ctrl+w (Custom)       shift+home  Select the cursor position to the beginning of the line       

Replace variables and definition variables in SQL * Plus, and sqlplus Replace variable Replace variables in SQL * Plus are also called substitution variables. They are generally used to temporarily store relevant data and pass values between SQL

The following code uses the platform Windows 64bits+vs2012.The following concepts are often encountered when programming in C + +: constants, literal constants, symbolic constants, literal constants, constant variables, string constants, and

Let's talk about those things of typedef and those things of typedef. Recently, when reviewing data structures, I often see typedef, but I still don't know how to use typedef. For details, refer to C Primer Plus 5th. and write the content for your

Today, with shape, there are a lot of properties here, and here I'm documenting the use of each attribute and what it means. XML version= "1.0" encoding= "Utf-8"?> Shapexmlns:android= "Http://schemas.android.com/apk/res/android"Android:shape=["

This article mainly introduces the pure JS image verification code function and compatible with the IE6-8 browser, need friends can refer to the next article mainly introduces the pure JS image verification code function and compatible with the IE6-8

When we mention preprocessing, we can't help but think of a classic problem. Is the C language simple? Simple. The C language does not have much syntax, so I will soon learn it. Indeed, the C language is much simpler without preprocessing. But once

Objective:Now the JavaScript library is very many, its writing all sorts, summarizes several we often see, as own knowledge accumulation. The current version of JavaScript does not provide a native, language-level modular organizational model, but