Programmer Group

Because the direction of the paper is divided (yes, it is divided, not chosen by oneself, there are many reasons. Postgraduate students, at the very beginning, in December, the reply was done in content development. Although it was very hopeless, it still needs to be done a little bit. The direction of ...

switch optimization method based on function matrix Definition of command code Advantage expectation proposal Definition of command code During the development of c language, the following situations are often encountered (such as command code mechanism of modem bus protocol): #define PFUN_REQ_C ...

An example is used to test the traversal performance of ArrayList and LinkedList. Structural differences: There are two kinds of lists commonly used by us, ArrayList and LinkedList. Although both are list, the performance of different traversal methods varies greatly due to different internal storage structures. Characteristics of Lis t storage ...

Porting kfifo based on Linux to STM32 (supporting mutually exclusive access of os) About kfifo Kfifo is a First In First Out data structure in the kernel, which uses the data structure of circular queue to realize; it provides a boundless byte stream service, and the most important point is that it uses the parallel lock free programming techno ...

supplement Before we begin today's content, let's add the last article. From Single Chip Microcomputer to Operating System-1 A little missing knowledge. BaseType_t xTaskCreate(       TaskFunction_t pvTaskCode,                              const char * const pcName,                              uint16_t usStackDepth,                       ...

When using iptable for nat settings, you can use the following extension options: # SNAT Source Address Translation, Used in POSTROUTING, INPUT Chain --to-source [<ipaddr>[-<ipaddr>]][:port[-port]] --random # Mapping to random port number, --random-fully # Mapping to Random Port Number (PRNG Completely Randomized) --persiste ...

Still continue to study and encourage yourself every day. Character array char word[] = {'H','e','l','l','o'}; This is not a string in c language. It can't be computed in the way of a string. I. Strings char word[] = {'H','e','l','l','o','\0'}; The difference is that there is an extra zero at the end, which becomes a string. A string of charac ...

sort Re-adjust the order of a set of ordered elements by size (as long as the definition returns true or false comparisons, not necessarily numerical comparisons). Quick sort Quick sorting is similar to merge sorting, but merge sorting is to sort and merge elements in array length (1,2...n/4,n/2,n) sequentially, first sorting in a small range ( ...

C++ Type Conversion static_cast Universal const_cast de-constant dynamic_cast subclass type to parent type (converting an object to its actual type is unsuccessful to NULL) The pointer transformation of reinterpret_cast function does not have portability Primitive type conversion, all of whi ...

I. Storage of nodes in linked list The left part of the node in the list is the stored data, and the right part is the address of the subsequent pointer pointing to the next node. C language usually defines a structure type to store a node, as follows: struct node { int data; struce node *next; //The type of the next node is also ...