definition computer

First, preface In C-language code or C + + code, macro definition #ifndef ... #define ... #endif主要是为了避免头文件重复引用, how is it a avoidance mechanism? This is related to the scope of the macro definition. Two, macro definition scope First, the scope of the macro definition in the C language standard is, starting at the defi

The Linux shell can be user-defined functions and can be called casually in shell scripts. Here's how to define it, and what to call attention to. I. Defining shell functions (define function)Grammar: [Function] funname [()] { Action [Return int;] } Description 1, can be with function fun () definition, you can also directly fun () definition, without any parameters.

Tags: mysql conditional definition handles exception captureOverview In MySQL, specific exceptions require specific processing. These exceptions can be linked to errors, as well as general process control in subroutines. 定义异常is to define in advance the problems encountered during the execution of a program, which defines how the process should be handled when a problem is encountered, and that the stored procedure or function can continue to execute w

An array is a collection of ordered data, and each element in the array has the same array name and subscript to uniquely determine the elements in the array.1. One-dimensional arrays1.1 Definition of one-dimensional arrayType arrayname[];Type[] Arrayname;The type can be a random data type in Java, contains a simple type combination type, the array name arrayname to a valid identifier, [] indicates that the variable is an array type variable.Another f

Dreamweaver8 definition of Web Features page introductionSpeaking of Dreamweaver8, I believe everyone is more familiar than me, maybe someone said Dreamweaver8 is a development tool, that development tools, I think so, Dreamweaver8 is a professional web development tools; So in the development of the point of view I am an absolute rookie, can be said to be ignorant, before did not do the development of the first thing, and now began to touch slowly, s

An array is a collection of ordered data, and each element in the array has the same array name and subscript to uniquely determine the elements in the array.1. One-dimensional arrays1.1 Definition of one-dimensional arrayType arrayname[];Type[] Arrayname;The type can be a random data type in Java, contains a simple type combination type, the array name arrayname to a valid identifier, [] indicates that the variable is an array type variable.Another f

1. Define the interfaceUse interface to define an interface. Interface definition similar to the definition of the same, is also divided into the interface of the Declaration and interface body, which consists of a constant definition and method definition two parts. The basic format for defining an interface is as fol

1. Define the interfaceUse interface to define an interface. Interface definition similar to the definition of the same, is also divided into the interface of the Declaration and interface body, which consists of a constant definition and method definition two parts. The basic format for defining an interface is as fol

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

the definition and use of arrays One, 1. Definition of one-dimensional array: Type descriptor array name [constant expression]; Note: Constant expressions include constant and symbolic constants and cannot contain variables. 2. Reference to one-dimensional arrays: Array name [subscript]; 3. Initialization of one-dimensional arrays: A. Assigns an initial value to the array element when defining the arrays;