define paas

1. Wide screen height and common size#define SCREEN_WIDTH ([UIScreen mainscreen].bounds.size.width)#define Screen_height ([UIScreen mainscreen].bounds.size.height)#define Navigationbar_height 44.0f#define Tabbar_height 49.0f#define Statusbar_height 20.0f#

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:if (condition) { const FOO = ' BAR '; // Not defined }// but if(condition) { defind (/// definition }A common detection constant is d

Parse the differences between const and define in php. 1. const is used for defining class member variables. once defined, the value cannot be changed. Define defines global constants that can be accessed anywhere. 2. define cannot be defined in the class, but const can. 1. const is used for defining class member variables. once defined, the value cannot be chang

TypedefIt is a type-defined keyword that is used to declare Custom Data Types in computer programming languages and used with various original data types to simplify programming. #DefineIs a preprocessing command. Let's take a look. Typedef is a C language statement that allows you to take an "alias" for an existing data type ". For example: typedefintINTEGER； After that, INTEGER can be used to replace int as the type of the INTEGER variable, for example: INTEGERa,b; Using typede

C #-# define condition compilation, Introduction: C # pre-processor commands will never be converted into executable code commands, but will affect all aspects of the compilation process. Commonly used pre-processor Commands include # define, # undef, # if, # elif, # else and # endif, etc. The following describes the example of using # define in C # For Condition

1 similarities and differences as constants (0) SameBoth can be used to define constants;#define PI 3.14159//Macro ConstantsConst DOULBE pi=3.14159; Constant(1) different compiler processing methodsThe Define macro is expanded in the preprocessing stage;Const constants are used in the compile run phase;(2) Different types and security checksDefine macros have no

Let's say the following code is required to be compatible with three versionsThis will not complete the task.No mattertypedef enum{first,second,third,}; #define NUM third#if (num = = first) #define VAR 1#elif (num = = SECOND) # Define var 2#elif (num = = third) #define var 3#endifint main (void) {#if (num = = fi

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

Q: How do I define global variables in VC? A:Put in any fileUse extern declaration in other filesOr declare a Public Member in the App class.It can be used in other classes of the program.AfxGetApp () gets an App object pointer and converts it to your App class pointer.Then you can use the pointer-> variableIn additionThe class defined in MFC only for static members can be directly applied at that time.Damaged Structure A: You can also create a. h hea

Try to use const and inline instead of # define This clause is best referred to as "try to use the compiler instead of preprocessing", because # define is often considered not part of the language itself. This is one of the problems. Let's look at the following statement: # Define aspect_ratio 1.653 The compiler will never see the aspect_ratio symbol name, becaus

Http://blog.csdn.net/zhanglianpin Global variables should be variables that are allocated in memory and can be called by other modules using the extern keyword in C language. Therefore, it must be defined in the. C and. H files. This repetitive definition can easily lead to errors. The following methods can be defined only once in the header file. Although it is a bit difficult to understand, once the user Master, it is flexible to use. The definitions in Table 1.2 appear in the. h header file t

Today continue to try the version of Seajs 2.3, then do something about the demo good, just a simple data template bar, and then through some other details in-depth study First look at the directory structure, according to the official demo erection Index.html is just a simple entry file and SEAJS configuration item, at the bottom there is a seajs.use load Crontroller module and then callback the exposed combine method Crontroller module, there are some official instructions and debugging, tri

[Convert] # ifndef # define # endif usage (Arrangement) Original Author: icwk # Ifndef # Ifndef in the header, which is critical. For example, you have two C files, both of which include the same header file. During compilation, these two C files need to be compiled into a runable file together, so the problem arises and a large number of declarations conflict. Put the header file content in # ifndef and # endif. Whether or not your header file will b

Recently in the cloud Platform for the initial code architecture, encountered a constant definition speed comparison problem, so do a comparison. The APC extension for PHP is described in the following paragraph in the PHP Manual: http://cn.php.net/manual/zh/function.apc-define-constants.php Define () is notoriously slow. Since the main benefit of APC is to increase the performance of scripts/applications,

The definition of APC constant is compared with define of PHP. Recently, when I was working on the preliminary code architecture of the cloud platform, I encountered a constant definition speed comparison problem, so I would like to make a comparison. Php apc extension, which is described in the following section in the PHP Manual: h recently encountered a constant definition speed comparison problem when working on the preliminary code architecture o

Use hidef extension in PHP instead of define to improve performance, hidefdefine. In PHP, hidef extension is used instead of define to improve performance. hidefdefine requires a new constant to open the local config. PHP file, think of hidef tested a few years ago and apc to improve PHP using hidef extension instead of define to improve performance, hidefdefine

A constant is a simple identifier. This value cannot be changed during script execution (in addition to the so-called magic constants, they are not constants). Constants are case sensitive by default. Usually, constant identifiers are always uppercase. can be used define () function to define constants. After php5.3.0, you can use the Const keyword to define

Macro definition ' DefineRepresents a string with a specified identifier (that is, the name), which is in its general form:' Define identifier (macro name) string (macro content)such as: ' Define signal stringIts function is to specify the identifier signal instead of string, in the process of compiling preprocessing, all the signal after the command is replaced by string. This method allows the user to rep

ES6 (ECMAScript 6) is the upcoming new version of the JavaScript language standard, code-named Harmony (meaning of harmony, obviously did not keep pace with our country, we have entered the Chinese Dream version). The last standard was enacted in 2009 ES5. The ES6 is currently in the process of standardization and is expected to release the officially finalized version in December 14. But most of the standards are in place, and browser support for ES6 is also being implemented. The way in which

css|frontpage| Web page Note: The latest version of FrontPage is Frontpagexp (FrontPage 2003), this article is about Frontpage2000, but the method described in this article is basically applicable in Frontpagexp! Another, This is only discussed in Frontpage2000 how to define CSS, as for the knowledge of CSS, please refer to the relevant information. When many people find it convenient to define CSS in DW4,