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Recently busy a Bluetooth project, in the processing of Bluetooth data, often encountered between the conversion between the system, Bluetooth processing is 16 binary (NSData), and we used to count the way is 10, in order to save space, Bluetooth

0x01 PrefaceThe recent CTF competition, more than once out of the PHP weak type of topic, to summarize the PHP weak type and the way to bypass0x02 Knowledge IntroductionThere are two kinds of comparisons in php = = = and = = =1 PHP 2 $a $b ; 3 $a= =

First, what is PHP?A) Definition: PHP is a hypertext preprocessorb) Hypertext: The content of our 8-day study is in fact hypertext contentc) Pre-processor: the equivalent of milk in the factory processing process, although we are not visible, but we

1. Be able to explain the difference between JDK and JREThe JDK (Java Development Kit) is a Java Development Kit (Javac.exe;java.exe) that is available to developers, including the JRE (Java Runtime Environment).The JRE (Java Runtime Environment) is

1. Keywords Keywords are given special meanings in Java, such as public void class, and all the keywords in the Java language are lowercase . But this sentence can not be reversed. 2. Identifiers Identifiers are actually some

Bluetooth4.0.jpgRecently busy a Bluetooth project, in the processing of Bluetooth data, often encountered between the conversion between the system, Bluetooth processing is 16 binary (NSData), and we used to count the way is 10, in order to save

File class:Java.io.File　　　Basic methods;Gename: Get file nameGetPath: Get File pathLength: Get File sizeIsdirectory: Judging If this thing is not a directoryIsfile: Judging this thing is not a fileListfiles: Gets all the files and folders under the

This article will be frequently encountered in the interview of Java Technology Point of a comprehensive in-depth summary, help us in the interview more handy, not to participate in the interview students can also take this opportunity to comb their

Data type:The Java language is a strongly typed language that defines specific data types for each type of data, and allocates a different size of memory space in memoryClassification of data types:Basic data type:Integer:Number of bytes occupied

Character, String type#print (1/2)# print (1//2) #地板除, is automatic rounding, not rounding, directly erase the decimal#if判断时候, both true and false, that is, true and false.Non-0 is true, non-null is TrueName=input ("Please enter your

CSS Properties Operations/1. Pseudo-class anchor pseudo-ClassRelated to /: Designed to control the display effect of linksA:link (links that have not been contacted) are used to define the general state of the link.A:hover (the state on which the

1. The arithmetic types are divided into two categories: integer and floating-point. The size of the arithmetic type differs on different machines, and the following table lists the minimum values for the dimensions specified by the C + + standard.

1. Java features and Benefits: simplicity, object-oriented, portability, high performance, distributed, polymorphic, multi-threading, security, robustness.2, Java operating mechanism, high-level computer programming language types are: compiled,

Flow :Concept: The operation of a file in Java is done in a streaming fashion. A stream is an ordered set of data sequences in Java memory. Java reads the data from the source (file, memory, keyboard, network) into memory, forms a stream, and then

Common usage of sizeof 1. The amount of memory that the base type occupies Type 32-bit system (bytes) 64-bit System (bytes) Char 1 1 Int 4 4 Short 2 2

Escape character:Escape characters are used to convert characters that are treated as code and characters that are not recognized, converting these characters to characters that can be printed out.The following are the functions of some escape

The 8 basic data types supported in the Java language are:byte (byte), short, int (integer), long (length), float (single-precision float), double (double-precision floating-point), Boolean (Boolean), char (character type) The concrete can be

1. Why a variable is requiredMemory is like a locker, used to store a variety of things or data, the programmer carcass, the data into memory is only the first step, but also to consider how to find the data deposited, the data stored can be

Data type　　In Java, there are 8 basic types (primitive type), with 4 integer ,2 floating-point types , and1 character types used to represent Unicode-encoded character cells Char and 1 boolean types that are used to represent truth values (Boolean

Reprinted from: http://www.cnblogs.com/gala/archive/2011/09/22/2184801.htmlThis article is very well written, so shameless turn.Sometimes it is necessary to use Python to process binary data, for example, access to files, socket operation. At this