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A further discussion: the difference between a macro, an inline function and a normal function _c language

Inline functions are executed in much the same ways as with parametric macro definitions, but the parameters are handled differently. Macro definitions with parameters do not perform an operation on the parameters, but instead directly replace the The inline function is the function first, which means that many properties of the function are applicable to the inline function, that is, the inline function fi

C + + macro detailed parsing _c language

Many C + + books have advised us that C-language macros are the root of all evils, but things are not as bad as we think, like Goto. Macros have a big role in automatically generating code for us. If the template can produce various types of code for us (type substitution), then the macro can actually generate new code for us on the symbol (that is, symbol substitution, increment). Some of the syntax questions about macros can be found on Google. Bel

C + + Journal macro definition function

In the C and C + + languages, an identifier is allowed to represent a string, called a macro, which can be a constant, an expression, a format string, and so on. When compiling preprocessing, all occurrences of the "macro name" in the program are substituted with the string in the macro definition, which is called "macro

C language Notes macro definition __c language

(i) Symbolic constants A macro definition is a substitution policy in C that uses a preprocessing command #define equate a string of (verbose) text with a name (called a macro), and then you can use the macro in bulk in the source code. In the preprocessing phase, replace the macros in the source code with the original text. For example, in the source code: #def

C language macro definition use Analysis _c language

1. How do I differentiate between macro names and macro strings in a macro definition? What should I pay attention to for macros with parameters? In a macro definition, the macro name and macro string are distinguished by spaces.

iOS notes-macro definition, conditional compilation, and file import notes

1, preprocessing instructions (1) Concept: C language in the source program before compiling, will first of some special preprocessing instructions to explain (such as #include (2) Preprocessing instructions are all preceded by "#" and do not end with a semicolon. (3) Preprocessing instructions can be placed anywhere in the file, his scope is from where it appears to the end of the file, we often put it in the source program head, so that its scope is the entire source program file. (4) Preproce

Begging for money, eye eyebrows jump and check the shirts all have xuanjicang

Create a sequence: 11 p.m.-1 a.m. some people have a banquet. 1 A.M.-3 A.M. Someone misses you and asks for something before a guest arrives. At 3 A.M.-5 A.M. Someone came to have an appointment. At 5 A.M.-7 A.M. Someone may ask you about the issue

C language Macro Definition method summary __c language

A single line definition of a macro#define A (x) t_# #x#define B (x) #@x#define C (x) #xWe assume: x=1, then there are:A (1)------〉t_1B (1)------' 1 'C (1)------"1" . How to define macros, cancel macrosDefining macros#define [macroname] [Macrovalue]Cancel macros#undef [macroname]Common macros#define PI (3.1415926)Macros with parameters#define MAX (A,b) ((a) > (b)? (a), (b))The key is very easy to produce errors, including machine and human understan

Macro Definition Usage Analysis

? macro definition: In a program, the start of a # is a preprocessing instruction.#define定义宏常量can appear anywhere in the code. As shown in the following illustration:To determine whether the macro definition is correct, to take the content of the macro definition to the real program, according to the actual program. #define从本行开始, this

OBJECTIVE-C macro Definition Detailed description _ios

Like to read some Open-source project source, always will find that the great God's code always have some short and efficient macro definition, click to see, find obscure, not to mention learning, sometimes understanding is a difficult, but the macro definition itself is not so difficult, But write a good macro of course still need rich experience and technology,

[C + +] defines a function with a macro

Important: The variables are enclosed in parentheses to prevent errors and end up not required; In practical programming, it is not recommended to use macros for complex functions, which is not easy to debug. Multi-line use \To write a good C language, a beautiful macro definition is very important. Macro definitions can help us prevent errors, improve code portability and readability, and more.In the softw

Pre-processing of C language -------- macro definition

1 OverviewUsed preprocessing commands starting. For example, include the command # include and macro definition command # define. In the source program, these commands are placed outside the function, and are generally placed before the source file. They are called preprocessing. Preprocessing refers to the work done before the first scanning (lexical scanning and syntax analysis) of compilation. Preprocessing is an important function of C language, w

Macro definition in C # define usage,

Macro definition in C # define usage, # Define is a macro definition Command provided in C language. Its main purpose is to provide programmers with some convenience in programming and improve the program running efficiency to a certain extent, however, when learning this command, students often cannot understand the essence of the command, and there is always some confusion here. The command is misused dur

MASM macro usage Summary

MASM (Macro volume ER) is an assembly tool provided by Microsoft. Although it has been around for some years, it still exists in newer tools such as vc.net. Many compilation textbooks take this as an object and show how to use compilation to design a program as a basic course for students in the Computer Science Department. However, the content is basically in version 5.1 and in the DOS era. Although the compilation under win32 is mentioned, it is not

Dark Horse programmer------C Language Learning Notes---macro definitions in C

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

#define macro definition in C language command usage _c language

#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

Pre-compiled macro definition set collation

Compilation preprocessing is the initial step in the process of converting a C source program into an executable program. This step is done by the preprocessor (preprocessor). Before the source program is processed by the compiler, the preprocessor first processes the macro (macro) in the original program.C Beginners may have no concept of preprocessor, this is understandable: the General C compiler will be

Visual Studio 2008 Scalability Development (ii): A preliminary study of macro and add-in

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

ASP. net mvc Tip #16-create an ASP. net mvc macro operation

ASP. net mvc Tip #16-create an ASP. net mvc macro operationASP. net mvc Tip #16-create ASP. net mvc macros Original American: http://weblogs.asp.net/stephenwalther/archive/2008/07/09/asp-net-mvc-tip-16-create-asp-net-mvc-macros.aspxHttp://www.cnblogs.com/mike108mvp Note: The translation level is limited. If there are any mistakes or mistakes in the translation, you are welcome to criticize and correct them. Thank you. In this post, I will dem

How to use macro definitions in C language

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

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