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2012-01-03 wcdjQuestion: What's the theory behind this: # ifdef _ cplusplus extern "C "{I have been meeting the following in some C/C ++ codes but I don't understand the theory behind it:# Ifdef _ cplusplusExtern "C "{# EndifI want to understand how it works. I know about the preprocessing but I don't know what that ex

Calling C ++ functions from Lua My second tutorial dealt with calling Lua functions from C ++. ThisOne deals with just the opposite situation-Calling C ++ functions from Lua. I couldn't think of a simple example that I was happy with, so I borrowed the average function from the official LuaDocumentation. This tutorial now covers version 5.1 of Lua. there are some

Many beginners are accustomed to using char variables to receive the return values of functions such as getchar, GETC, and fgetc. In fact, this is not correct, and it implies enoughFatal Error. The return value types of functions such as getchar areIntWhen these functionsRead ErrorOrAfter reading the file, Will returnEOF. EOF is a macro. The standard specifies that its value must beNegative constant of int type. Generally, the compiler defines EOF-1. This is where the problem occurs. Receiving t

++ Operator The increment operator (++) Increments its operand by 1. The increment operator can appear before or after its operandIncremental operators (++) Add the operand to 1. Incremental operators can appear before or after operands. The first form is a prefix increment operation. The result of the operation is the value of the operand after it has been incremented.The first form is the prefix incremental operation. The result of this operation is the value after the operand is added wit

Now the application development under Windows, VS. NET occupies the majority of the share. So many people who used to develop VC + + have turned to use more powerful vs.net. In this case, there are many developers who are faced with the problem of how to use C + + to develop good classes in C #. Here is a complete example of how to encapsulate a C + + class in Ma

Using C + + with Objective-cApple's Objective-c compiler allows users to freely mix C + + and objective-c in the same source file, with a mixed language called objective-c++. With it, you can use an existing C + + class library in

The release of the new C + + standard C++11 has led to the emergence of a large number of new books, as well as some classics. Andrew Binstock on Dr.dobbs to introduce some of the core books required to learn C + +.1. "C + + programming language" English fourth edition, Bjarne StroustrupThis book has been formally list

The characteristics of C, C ++, C #, Java, and PHP are identified by static local variables. The thinking on this problem comes from the implementation of the single-instance design mode in object-oriented design. The Standard Code for implementing the single-sample mode in C ++ is as follows: #include int ini

I. background C # And the new technical solution Web Service are developed using a new language in the development of a new project. However, in the new project, some old modules need to be used, it is generally written in C, C ++, or Delphi. There are three available methods for developers to use the old module:Filtered AdvertisementFirst, rewrite the

How to learn and understand the complex types of statements in C and C ++, the following article begins to teach you how to understand this complex C/C ++ statement step by step, this article will describe the profound meaning of C/C