mifi definition

There are two types of macro definitions: macro definitions without parameters and macro definitions with parameters. Macro definition without ParametersThe general format of macro definition without parameters is: # Define macro name string# Define PI 3.1415926Main (){Float area, R;Printf ("Area = % F", pI * r * R );}In the above program, the macro pi is used to replace the string 3.1415926. The advantage

Ask questions:If you have such a template:class test{public: static std::string info;};What is right (by compiling) for several of the following definitions?Template stringtestint>::info ("123"); templatestringTest"123"); templatestringTest:: Info;templatestringtestint>:: info; templatestringtestint>:: info (); templatestringTestIn order not to affect the analysis and judgment, I put the answer color into a relatively light color, the following is the answer: Template Template

We are in the program design, always use the definition of variables and variable declarations, but sometimes we are not very clear about the concept, know how it is used, but do not know how to do, the following I simply put their differences are described as follows: There are two things about the declaration of a variable:(1) One is the need to establish storage space (definition, declaration). For exam

#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 can be any space between the identifier and the string, which, once started, ends only wi

Definition of structureThe general form of defining a structure is:struct structure name{Member table columns}A member table consists of several members, each of which is an integral part of the structure.A type description must also be made for each member.For example: Copy Code code as follows: struct STU { int num; Char name[20]; int age; } description of struct type variableA struct

This article details the JavaScript of various common function definition methods, share for everyone to reference. The specific analysis is as follows: First take a look at four of the most common function definitions of javascript: Functions defined with function constructors, the code is as follows: var multiply = new Function (' x ', ' y ', ' return x * y; '); function declaration, this is also the most common one: function

Like a function template, using a class template enables a user to define a pattern for a class, allowing some data members in the class, arguments to some member functions, and return values of some member functions to take any type. A class template is an abstraction of a class that is different from a group of member data types only. Programmers can greatly improve the efficiency of programming by creating a class template for the entire family of classes, giving a set of program code to gene

Recently in busy live555 project; Honestly, this is the first big project I've done. Although it was the first time I had done such a big project for such a long time, I felt that I had made no progress in this year; adding a global variable wasted my half a day of force. No more nonsense, cut to the chase. Global variables, the earliest I read the C primer Plus is supposed to be called an outsider variable. is always declared with the keyword extern in a header file, the declared variable can

(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: #define PI 3.14Then in the next code, you need to write 3.14 of the place can be directly r

If you haven't contacted a dynamic language, it will be a magical and weird feeling to understand JavaScript in a compiled language, because the things that are often impossible in consciousness happen, and even feel unreasonable. If you're learning JavaScript in a free and changing language, this is the way you feel. , then from the beginning, please put down your "prejudice", because this is absolutely a new continent for you. Well, not to everyone chit chat when, to get to the bottom of it, l

Http://www.bkjia.com/Javabc/1007408.html SPRINGMVC conflicts with existing, non-compatible bean definition of same name and class solution, Springmvc get Bean problem causes Recently, the project team colleagues encountered a problem, his own responsible for the module, SPRINGMVC controller and other modules of the Controller class name, resulting in the whole project is not up. The error in the background report is this: Xxcontroller ' for Bea

1. Introduction of physical and pinIn the development of the time will often use the serial interface, the general 9-pin serial interface is mostly. As shown in the following:The male female head is used in the package for connecting wire. However, a 90-degree angled pin package is used for the Development Board. Such as:Each pin is defined as:2. Connection of male female head to MAX232When the male head is connected to the MAX232, we will find that the defi