A function consist of two parts:Declaration: the function's name, return type, and parameters (if any) Definition: the body of the function (code to be executed)void myFunction() { // declaration // the body of the function (definition)}...
A "definition" of a variable establishes the same associations as a declaration but also causes storage to be allocated for the variable.For example, the main, find, and count functions and the var and val variables are defined in one source file, in this order:...
根据6.7 的讨论,由一个标识符命名的对象和函数的 declaration,引起了存储空间预留,这个 declaration 就是 definition。 An external definition is an external declaration that is also a definition of a function (other than an inline definition) or an object. If an identifier declared with external linkage...
In computer programming, aforward declarationis a declaration of an identifier (denoting an entity such as a type, a variable, or a function) for which the programmer has not yet given a complete definition. It is required for a co...
#define DllImport __declspec( dllimport ) #define DllExport __declspec( dllexport ) DllExport int i = 10; /* Okay: this is an export definition. */ The use of dllexport implies a definition, while dllimport implies a declaration. You must use the extern keyword with dllexport to force a ...
external-declaration:/* 只允许在外部(文件)范围内 */ function-definition declaration function-definition? declaration-specifiersoptattribute-seqoptdeclaratordeclaration-listoptcompound-statement /*attribute-seq为 Microsoft 专用 */ 原型参数为: ...
十. 函数 ● 基本概念 函数 函数定义 function definition: return_type function_name ( parameter list ) { Body of function; } //函数体内先是变量的声明, 然后是语句; 这就样平时看到的主函数一样, 先有变量
C 语言区分了函数的 定义(definition)和声明(declaration),这对库来说很重要。接下来让我们开始了解定义。C 语言仅允许命名函数不允许匿名函数,并且每个函数需要定义以下内容: 一个唯一的名字。一个程序不允许存在两个同名的函数。 一个可以为空的参数列表。参数需要指明类型。 一个返回值类型(例如:int 代表32 位...
/* functiondeclaration*/ voidfunc(void); staticint count = 5; /* global variable */ Int main { while(count--) { func; return 0; } return 0; } /* function definition */ void func( void ) { static int i = 5; /* localstaticvariable */ ...
12 declaration 说明 13. type conversion 类型转换 14.define 、definition 定义 条件语句: 1.select 选择 2. expression 表达式 3. logical expression 逻辑表达式 4. Relational expression 关系表达式 5.priority 优先 6. operation 运算 7.structure 结构 ...