register variable

1. Frequently accessed and modified variables, C has a good thing called register variables. The register declaration only applies to function parameters and auto variables. However, -- register variables can be compiled and ignored. That is to

Tag: equals variable Request Const parameter nbsp Three mesh operator and accept1.register keyword EnhancementThe register modifier implies that the corresponding variable of the compiler will be used frequently and, if possible, should be kept in

Storage Type: The storage type of a variable is the type of memory that stores the value of the variable;    The storage type of the variable determines when the variable is created, when it is destroyed, and how long it will be stored;Storage

Overview Basically every language has to discuss this topic, C is no exception, because only you fully understand each variable or function storage mode, scope and destruction time to correctly use the language. Today, we will focus on the scope,

//difference ①: Usability Enhancement#include using namespacestd;The variables in the//C language must be defined at the beginning of the scope!! More emphasis is placed on the "practicality" of language in C + +, and all variables can be defined

The scope of a variableThe C language divides variables into local variables and global variables, depending on the scope of the variables. 1. local variable 1) Definition: A function defined inside a function, called a local variable. Formal

Overview Basically every language has to discuss this topic, C is no exception, because only you fully understand each variable or function storage mode, scope and destruction time to correctly use the language. Today, we will focus on the scope,

Keyword OverviewMany friends see here may have the question, often other speak C language books are from HelloWorld, the data type starts the C language to learn, why we should start from the C language keyword? On this point, I have two points to

Third, static variables The type descriptor for a static variable is static. Static variables are, of course, static storage, but the amount of static storage is not necessarily static variables, such as external variables are static storage mode,

C Language Nineth Round: scope and Storage type  "Learning goals"1. Local Variables2. Global variables3. Storage type4. MemoryA: Local VariablesLocal variables are also known as internal variables. A local variable is a description defined within a

2 local variables and their scope and lifetime 2.1 auto variablesWhen you define a variable inside a function or in a compound statement, if you do not specify a storage class or use the auto specifier, the default variable defined by the system is

++ ++ C language deep understanding series-keywords: auto and register Follow the original author to view other blog posts. This article is original on this site. You are welcome to repost it! Reprinted please indicate the

Original address: http://www.cnblogs.com/yc_sunniwell/archive/2010/07/14/1777433.html Scope rules tell us the valid range of a variable, where it was created and where it was destroyed (that is, out of scope). The valid scope of a variable starts at

Reading notes: C-depth anatomy of the "C language in Depth" this book is a good book to solve the programmer's secret of the interview test. The author Chengzhong "to the gold to brave the challenge of similar books at home and abroad," Indeed, the

Use macro definition In C, macros are the only way to generate embedded code. For embedded systems, macros are a good method to replace functions to meet performance requirements. Write a "standard" macro min, which inputs two parameters and returns

Scope global variable local variable static variable external variable constant volatile variable Scope:The scope rule tells us the valid range of a variable, where it is created, and where it

In terms of performance optimization, we always pay attention to the 80-20 principle, that is, 20% of the program consumes 80% of the running time. Therefore, to improve the efficiency, we mainly consider improving the 20% code. Do not optimize the

The attributes of variables and functions include the data type and data storage class. The storage class index data is stored in memory (static and dynamic), including auto, static, register, and extern.   Memory. Specifically, memory is divided

All variables in C language have their own scopes. The types of declarative variables are different, and their scopes are also different. Variables in C language can be divided into local variables and global variables according to the scope.I.

Scope rules tell us the valid range of a variable, where it was created and where it was destroyed (that is, out of scope). The valid scope of a variable starts at its defining point, to the first closing parenthesis of the nearest opening brace