while 0

Compilation preprocessing is the initial step in the process of converting a C source program into an executable program. This step is done by the preprocessor (preprocessor). Before the source program is processed by the compiler, the preprocessor

Binary tree creation and traversal (non-recursive traversal left and right, destroy tree structure) create a recursive 3-way traversal of a two-fork tree:1, first center, then left tree, then right tree2, first left tree, then center, then right

Linux obtains IP and NIC information for the machineThe code comes from the network, I rewrite, have the United States dare not self-specialized, special share. The usage is simple, just 3 functions.Header file Getmac.h:/** * getmac.h * * 2014-07-08:

Macro definition that contains if When the macro definition contains an IF 1) define the following macros#define DC (P) if (foo (p)) fun (p) Used in the following environment if (k>n) DC (k); Else DC (n); After the macro is replaced, the following

Original address: http://c4fun.cn/blog/2014/03/06/libev-study/ ---- Intro Libev is a reactor-based event library with high efficiency (Benchmark) and code refinement (4.15 versions over 8,000 lines), which is a great resource for learning

Application of Variable parameters in macro definition in C Language In the C standard library, input and output functions of printf, scanf, sscanf, sprintf, and sscanf are variable parameters. When debugging a program, we may want to define a

When we mention preprocessing, we can't help but think of a classic problem. Is the C language simple? Simple. The C language does not have much syntax, so I will soon learn it. Indeed, the C language is much simpler without preprocessing. But once

Indispensable Windows Native (3), windowsnative [Download source code]Indispensable Windows Native (3)-C language: operators, expressions, conditional statements, cyclic statements, steering statements, empty statements, etc. Author:

This article describes how to develop a horizontal scrolling shooting game.1. Rebuild the background in the codeCreate a node ParallaxBackground in the project. The header file is very simple./** ParallaxBackground. h** Created on: 2012-9-18* Author:

Macro definition containing if When the macro definition contains if1) define the following macro# Define DC (p) if (FOO (p) Fun (P)Used in the following EnvironmentIf (k> N)DC (k );ElseDC (N );After macro replacementIf (k> N)If (FOO (k ))Fun (k )

Document directory Use... Incorrect nesting-misnesting Problems caused by operator priority-operator precedence Problem Remove unnecessary semicolons-semicolon swallowing Duplication of side effects To

The previous section introduced the knowledge about System V shared memory. Now let's take a look at POSIX shared memory and functions. Shared Memory is simply a real physical memory area. Some functions can be used to map this area to the address

1. open the file kernel data structure 1. A process opens two files File status flag: read, write, append, sync, non-blocking, etc. 2. A process opens the same file twice 3. Two processes open the same file Example program: C ++ code

When using a command-optimized compiler, do not think that commands will be executed strictly in the order they appear in the source code. For example, the compiler may reschedule assembly language instructions to enable optimal use of registers. In

1. Typical UDP client/server communication process Following the communication process, we will implement a UDP redirection Client/Server. # Include # Include Ssize_t send (INT sockfd, const void * Buf, size_t Len, int flags ); Ssize_t sendto

//HelloWorld.h#include "cocos2d.h"#include "ui/CocosGUI.h"#include "First.h"#include "Second.h"#include "Third.h"USING_NS_CC;using namespace ui;enum Tag{ FIRST = 1, SECOND, THIRD};class HelloWorld : public cocos2d::Layer{public: // there'

Do {...}While (0); // while (false)TIPS: 1. Use in macros:See the following situation:# Define swap (x, y) {int TMP = x; X = y; y = TMP ;}If this is the case during use:If (condition) Swap (A, B);Else {...}Will be replaced with: If (condition) {int

01: prevent a header file from being repeatedly contained # Ifndef COMDEF_H# Define COMDEF_H// Header file content# Endif   02: redefines some types to prevent the differences in the number of bytes of the types caused by different platforms and

One problem is how to delete two characters with the same string, such Str1 = "abcdeafg" str2 = "blimklaaaaa" To get: Str1 = "cdefg" str2 = "limkl" Write the program directly below. I wrote this program, but the idea is others '. For the

Cocos2d-x 3.1.1 Study Notes [18] Sprite creation tour, cocos2d-x3.1.1 // Input a string to create an Sprite * Sprite: create (const std: string & filename) {// request a memory block from the system/* std :: when nothro has insufficient memory,