MD5 algorithm "computes the MD5 value of files and strings"

Label:1. The MD5 algorithm is a hash (hash) algorithm (digest algorithm, fingerprint algorithm), not a cryptographic algorithm (error-prone). Any content of any length can be computed with MD5 hash value. MD5 's predecessor: MD2, MD3, MD4.

Introduction of MD5 algorithm and implementation method of JDK self-bring

Label:MD5 algorithm, has been known, as a senior or entry-level developers, are called "MD5 ah, know know." A few days ago the program slightly small problem, because some places are encrypted, and some places are not encrypted. A colleague is proud

Math and programming

Label:Many people letter asked me, to become a good programmer, the basis of mathematics to achieve what degree? 18 years ago, when I was a freshman in the University of Computer science, I was plagued by the same problems. In the face of learning

eq equal NE, neq unequal, GT greater than, LT is less than GTE, GE is greater than or equal to LTE, Le is less than equals not non-mod modulo, etc.

Label:eq equal NE, neq unequal, GT greater than, LT is less than GTE, GE is greater than or equal to LTE, Le is less than or not non-mod modulo is [not] div by whether it can be divisible by a number is (not) even is an even is [NOT] The even by $b (

Floor (x) function

Label:The floor (x) function, which takes the whole function down, returns the largest integer not greater than X, which is different from rounding.For example:Floor (3.14), return 3Floor (3.99), return 3Floor (-3.14), return-4Floor (-3.99), return-4

setsockopt () usage (parameter details)

Label:NT SetSockOpt (SOCKET S,int level,int optname,Const char* Optval,int Optlen);S (socket): points to an open set of interface descriptor wordsLevel: Specifies the type of the option code.Sol_socket: Basic set of interfacesIpproto_ip:ipv4 Socket

STM32 Hardware CRC32 Use

Label:Recently used STM32 CRC32 module, look at the official website Lib, feel very simple to use. However, you will find that the direct use will appear, and many online CRC32 Web sites or PC-side CRC32 Verification Tool calculation results

When to use Em with Rem

Label:You may already be proficient in using these two flexible units, but you may not fully understand when rem to use and when to use them em . This tutorial will help you figure it out!emAnd rem are relative units that are converted by the

Development training began to register, August 17~20, Shanghai, hurriedly register AH

Label:Registration Link: Please click the link to complete the online registration Welcome to the Autodesk Product development training Course

On the derivation of the range of unsigned char for -128~127

Tags: programming data sheet microcomputerFor char type data, it is generally divided into unsigned and signed two types, here to illustrate the scope of the problemThe first is the unsigned char, which is simple,0000 0000 ~ 1111 1111 range 0 ~

RabbitMQ

Label:(Go: original link http://www.cnblogs.com/yangecnu/p/Introduce-RabbitMQ.html)In the field of enterprise application system, the communication, integration and integration between different systems will be faced, especially when faced with

X86 Architecture and ARM architecture

Label:1. About the x86 architectureX86 is a standard number abbreviation for an Intel general-purpose computer series, and also identifies a set of generic sets of computers, X86 is a complex instruction set introduced by Intel to control the

POJ 2777 Count Color

Tags: poj 2777 count Color segment Tree Segment update delay token binary representationC-Count ColorTime limit:MS Memory Limit:65536KB 64bit IO Format:%i64d &%i64u SubmitStatusPractice POJ 2777Appoint Description:System Crawler

Drupal 7 modulo. info File description

Label:Drupal uses the. info file to save topic (theme) and module (modules) basic data (metadata).Coding: We recommend using UTF-8. This is a no BOM (Byte Order Mark).Here is an example of a. InfoName = really Neat Widgetdescription = provides a

04-Tree 7. Search in a Binary search Tree (25)

Label:04-Tree 7. Search in a Binary search Tree (25) time limitMemory Limit 65536 KBCode length limit 8000 BProcedures for the award of questions StandardAuthor Chen, Yueto Search a key in a binary search tree, we start from the root and move all

HDU 3018Ant Trip (a stroke problem, using and checking the connected components of undirected graphs)

Tags: and check set1. Test instructions: Give a simple picture without a direction, ask at least a few strokes to finish drawing all the sides.2. Idea:① first Use and check set to find a few connected components;② If there is only one node in the

ZOJ 3427 Array Slicing (scanf use)

Tags: ACM ZOJTest instructions Watashi invented a kind of egg ache (Eggache) language you want to implement an array slicing function for this language function is to have an array initially empty each time you give you an interval [L, R) and some

[to] calculate the distance according to the latitude and longitude of two points

Label:Calculate distance based on two-point latitude and longitudeHow are these longitude determined? The earth is constantly spinning around its axis (the earth's axis is a center of the north-south poles and the Earth.Imaginary line), in the Earth'

Analysis of why the range of char types is: 128~+127

Tags: c languagein C, the range of signed char types is -128~127, which is written in every textbook, but no book (including the teacher) will give you a -128~127, and the question seems simple and easy enough not to think about why, Is there a

POJ 3264 segment tree to find interval maximum minimum value

Label:DescriptionFor the daily milking, Farmer John's n cows (1≤ n ≤50,000) always line up in the same order. One day Farmer John decides to organize a game of Ultimate frisbee with some of the cows. To keep things simple, he'll take a contiguous

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