macro book

There are two types of macro definitions: macro definitions without parameters and macro definitions with parameters. Macro definition without ParametersThe general format of macro definition without parameters is: # Define macro

Some people regard macros as the beasts of the flood, and even require them to be completely abandoned from C/C ++. Some people regard macros as the supreme template, which is widely used in logic code. I personally think this is a matter of opinion and wisdom. It is unnecessary to abandon it. Let's look at some classic applications of macro in MFC and ATL, you will find that if you do not use macros to Implement Message ing and object ing, it will ma

In GNU C, a macro can accept a variable number of arguments, just like a function, such as: 12 #define pr_debug(fmt,arg...) \ printk(KERN_DEBUG fmt, ##arg) Passing variable parameter tables with variable-parameter macros (Variadic macros)You may be familiar with the use of variable parameter tables in functions such as: 1 voidprintf(constchar* format, ...); Until recently, a mutable param

picture description hereint * const p; Write a picture description hereSo generally we define a constant and don't want to be modified like this:NSString * const HSCoder = @"汉斯哈哈哈";Test:Define a constant Hscoder in Viewcontroller: Write a picture description hereIn Appdelegate Modify constant Hscoder, see the following error prompt:Write a picture description hereIn a generic project, define global constants, which are written in separate filesHSCONST.M Defining constants:Write a picture descri

1.5 C language Program running process01 source program: Written by high-level or assembly language, C language source program extension. C02 Target Program: The source program is translated by the "compiler" binary code is the target program, its extension is. obj03 Executables: The target program is connected to the library function to form an executable program. Out#include intMain () {#definePI 3.14DoubleR,len,area; printf ("Please enter radius: \ n");//Prompt user to enter RADIUSscanf ("%LF

#defineThe command #define defines an identifier and a string. Each time the identifier is encountered in the source program, it is substituted with a defined string. The ANSI standard defines an identifier as a macro name and replaces the process with a macro substitution. The general form of the command is: #define Identifier string Attention:1. The statement does not have a semicolon. There

Gitbook set up local book 1, do not login, click Do this later2, click New book–> Enter book name –>confirm3, the path of the book4. Book Display5, Release6, import others book error and introduction7, related documents ———————————————————————- 1, do not login, click Do thi

The difference between a macro and a function with parameters? Macro substitution does not take up a run time, only the compile time, and the function call takes up the elapsed time (allocation Unit, reservation field, value Pass, return), so each execution is loaded so it is slower to execute.? When defining a macro, do not type a space between the

Objective In the VS overview, we briefly review the history of vs. This article will illustrate the development of macro and add-in with two simple examples. By macro us to record some of the duplicates in VS, we can run them multiple times to save time and maintain a good mood; through add-in, we can add new functionality to vs by ourselves, extending vs means expanding ourselves. VS 2008 expanded Way at

"Experimental Purpose"1) Learn about macro viruses2) How to learn macro virus"Experimental principle"Macro viruses are malicious programs written in macro language (VBA) that exist in Word-processing documents, spreadsheets, databases and other data files, such as Office data Processing systems, which use the functions

Special Symbol #, # #(1) #　When you put a # Before of argument in a preprocessor macro, the preprocessor turns that argument into a character array.Using a # in front of a parameter in a macro, the preprocessor converts this argument to an array of characters　Simplified understanding: #是 The meaning of "string", which appears in the macro definition # is to conve

Summer, is a "virus" season, computer viruses are no exception, especially the risk factor is very large Doc virus (virus macro virus) is the use of IE browser access to the network on the Doc page, will also be inexplicably to "black" a. So what is doc exactly a virus ah, it is how black their own baby computer it? Now let's take a look at what the doc virus looks like. Macro virus, it is a special virus

Internship Time: 2016.2.10--2016.2.24Internship Location: Zhongguancun book building, Haidian District, BeijingInternship Report:"One step at a time", for our college students, internship is an important part of life experience, but also an important steps, is the new era of college students to connect theory and practice the most important is the best way, for us to work Post laid a solid foundation.This choice in the Zhongguancun

1. How do I distinguish "macro name" from "macro string" in macro definition "? What should I pay attention to for macros with parameters? In macro definition, "macro name" and "macro string" are distinguished by "space. During

[Switch] DEFINE introduction and multi-row macro definition in C language, define multiple lines [Go] DEFINE introduction and multi-row macro definition in C LanguageTo write a good C language, a beautiful macro definition is very important. Macro definition can help us prevent errors and improve code portability and r

For a complete description of macros and inline functions, see Http://wenku.baidu.com/view/dbf9051c59eef8c75fbfb39f.html This article from http://hi.baidu.com/liugang585570/blog/item/83fa38f9c9d8fd04d8f9fd04.html Before introducing inline functions, it is necessary to introduce preprocessing macros. The functions of inline functions are similar to those of preprocessing macros. We believe that we have used preprocessing macros. We often define some macros, such # Define table_comp (

Referrence: Http://gcc.gnu.org/onlinedocs/cpp/Argument-Prescan.html#Argument-Prescan Procedure Macro_expand (macro (argv)/* macro extension process with parameters. The macro is macro and the parameter is argv */{/*. If the macro is defined as a

Macro usage, usePreface Macros play a major role in C/C ++. Keywords Several Functions of macros 1. Define Constants 2. Define an expression 3. Simplify tedious code 4, as the identifier 5. variable parameters 6, # And # 1. Define Constants For example, you can use a macro to define the PI value. #define PI 3.1415927 2. Define an expression #define MAX(a, b) (a>b?a:b) 3. Simplify tedious

Macro substitution in C languageFirst look at a question:#include #define Print_cline () printf ("%d", ___)int main (void){Print_cline ();Print_cline ();return 0;}Fill in the appropriate code at the horizontal line so that the output of the above code is 34.I think that when people see this problem, there is no definite idea in the mind to answer it. When I saw the problem, I came up with a variety of ways to answer it, and eventually I didn't pass th

Earlier we learned how to use macro table functions to make catalogs, and how to use the Hyperlink function to configure links for the directory. Can be reopened, the related macro-table function is not the spirit ... Because the macro table function get. Workbook (1) works through macro functionality, so the doc