macro book

　　They have a common advantage is "change the whole, to avoid the input error" What are the two different? Some.The main difference is that the macro definition is done prior to compilation, and the const is processed during the compilation phaseMacros define constants that do not occupy memory cells and are defined by const occupy memory unitsA macro definition has the same effect as a const constant-----t

KVC (keyvaluecoding) "Key-value-code" is a mechanism for accessing class instance variables directly through the string's name (key).KVC can be used to access and set the value of an instance variable.Setting mode: [Self setvalue:aname forkey:@ "name"][Self setvalue:aname forkeypath:@ "Person.name"]Access mode: astring = [self valueforkey:@ "name"]astring = [Self valueforkeypath:@ "person.name"]1 Main function Contents2Person *xiaoli =[[Person alloc]init];3 //

named initcall. init, and analyze the kernel initialization function.How does do_initcballs () Use macro definition _ define_initcall (Level, FN) and its phaseTo initialize some parts of the kernel in sequence.1. Analysis _ define_initcall (Level, FN) macro definition1) The macro is defined in inlclude/Linux/init. h:# DEFINE _ define_initcall (Level, FN )/Static

Network Source: http://blog.chinaunix.net/uid-14022540-id-2849095.html usage of "#" and "# # " in macros I. GENERAL usageWe use # to turn the macro parameter into a string , and use # # to fit the two macro parameters together . #include #define CONS (A, b) ((int) (a# #e # #b)) #define STR (s) #s int main () {printf ( %s\n " ,str (ABC)); printf ( %d\n ", CONS (2 , 3

Http://blog.163.com/wshyao@126/blog/static/1070451420081018103237836/ # Connector and # Connector # The Concatenation symbol is composed of two pound signs. Its function is to connect two substrings (tokens) in the macro definition with parameters to form a new substring. But it cannot be the first or last substring. The so-called token refers to the minimum syntax unit that the compiler can recognize. The specific definition has a detailed explanatio

Https://www.jianshu.com/p/7c20b299ee63Traditionally, we've been calling this thing a variable in makefile, which is essentially a macro, just a string substitution. How can we call it a macro?Name of the macroMakefile macros can contain characters, numbers, and underscores. One thing to note is that a macro is a macro,

turn on macro command function In PowerPoint 2013, for example, the operations of other versions are slightly different. Click menu: file → options → custom ribbon → main tab, tick "development tools". or find "macros" directly in all commands and add them to the custom menu. Click the "Development tool" menu, you can see the "Macros" icon in the common toolbar "code" Enable Macros and enter the appropriate VBA code Proced

Statements in assembly language programs can be composed of commands, pseudo commands, and macro commands. Command: Each Command corresponds to a CPU operation. A pseudo-command is also called a pseudo-operation. It is an operation processed by the assembler during the compilation of the source program, they can complete functions such as processor selection, defining program patterns, defining data, allocating storage areas, and indicating program te

1,Use a # Before a parameter in a Preprocessor macro. The Preprocessor converts this parameter to a character array. (Original article: when you put a # Before an argument in a Preprocessor Macro, The Preprocessor turns that argument into a character array. This, Combined with the fact that character arrays with no intervening punctuation are concatenated into a single character array, allows you to make a

Andorid: Book-turning effect; andorid: Book-turning EffectContent Project Structure Environment Demo References The book turning effect mainly uses the method of drawing the besell curve. This article has three demos: Simple book flip. After the next page is turned over, the current page will not disappe

Use Python to implement the book expiration reminder, and use python to implement the book expiration reminder 1. Simulate login to the Library Management System Let's take a look at the login page (many schools have these management system pages that are very low ): Two methods are used to simulate the login to the Library: 1. Construct a logon form to simulate Logon This method of simulated login seems t

I have always believed that it is always best to learn about any new technology and the excellent books related to it. Of course, a good video tutorial can help you get to know the technology quickly, but to learn the technology in depth and in a systematic way, the best books are especially important. In combination with my own experience and lessons learned from Java, I make a list of some good books I've seen, which is my suggested reading order.1. The first

Macro definition Simple macroFormat: #define Identifier substitution list#define N 100int a[N];//N就是100Macros with parametersFormat: #define identifier (x1, x2, x3,...... xn) Replace list#define MAX(x, y) ((x) > (y) ? (x) : (y))Note: When the program compiles, it will replace the uppercase identifier with the original expression, so the program will increase at compile time.Advantages or DisadvantagesAdvantages① program may be a little faster② Macros

Some of the previous contents content as a student, rarely used, may be working to meet a little more, but the first comprehensive study still do not want to have something to fall, although not commonly used but at least have an impressionThen go to the third chapter "Macro __cplusplus"In code written in C and C + +, we often see the following declaration in the header file:#ifdef __cplusplus extern " C " {#endif // some code #ifdef __cplusplus} #

For example, I want to automatically delete an Excel form after March 2, 2013, and a macro called Macro1 in the table. 　　Specifically as follows: Sub Macro1 () Private Sub Workbook_Open () Application.DisplayAlerts = False Dim Datee as Date Datee = #3/2/2013# If Date > Datee Then Activeworkbook.changefileaccess xlreadonly Kill Activeworkbook.fullname Thisworkbook.close False End If End Sub But this ma