difference between function declaration and function definition in c programming

Transferred from: http://www.cnblogs.com/rocketfan/archive/2009/10/02/1577361.html   1. compilation unit: A. cc or. cpp file is used as a compilation unit to generate. O. 2. Definition and declaration of common data types, Function Definition and

First, the class nesting questionC + + header file Duplication is really a headache, suppose we have two classes A and B, respectively, defined in the respective header file A.h and B.h, but in a to use the b,b also use a, but this is certainly

About the declarations and definitions of C + + variablesAs we already know, a function generally consists of two parts: the declaration part and the execution statement. The role of the Declarations section is to describe the properties of the

Replace macros with inline: 1. Inline functions can be debugged at run time, while macro definitions are not possible;2. The compiler will do security checks or automatic type conversions (with normal functions) on the parameter types of the

C ++ declaration and definitionC ++ declaration and definition The Declaration is to introduce a name into the program. The definition provides a unique description of an object in the program. Declarations and definitions sometimes exist at the

In general, when we write JavaScript, we like to first name an empty function (such as code 1), I feel this will consume some performance, and the code is written more. You can actually declare the function you want to write without first declaring

The execution of an inline function is similar to a parameter macro definition, but the parameters are handled differently. The macro definition with parameters does not operate on the parameter, but instead, the inline function is the function,

Common Function Definition methods of JavaScript, javascript function definition This article describes various common function definition methods in JavaScript for your reference. The specific analysis is as follows: First, let's take a look at the

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

In javascript, function creation and declaration functions have common user-defined functions and anonymous functions. Next I will introduce the usage of these functions separately. Generally, when writing JavaScript, we all like to name an empty