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1987 PowerPoint official meeting with the user, PPT format is micro software Office software PowerPoint editor saved after the file format, also known as presentation document PPT (Power point) + computer + projector, instead of traditional film and slide. PPT has become one of the standards of presentation documentation, playing an important role in business and education, so let's review the history of PowerPoint. Microsoft PowerPoint 2.0

1. Selector:$ (". Class")$ ("#id")$ ("div")$ ("A P")$ (Div:first). CSS ("Border", "2px solid Red")2. Filter:$ (' div '). Find ('. Child '). CSS (' border ', ' 2px solid #999 ');$ (' #child1 '). Parent (). CSS (' border ', ' 2px solid #666 '); Parent element$ (' #child1 '). Parents (). CSS (' border ', ' 2px solid #333 '); First-choice elements$ ('. Child '). Filter ('. Not-gay '). CSS (' background ', ' red ');3. Operation Style$ ('. a '). CSS ({' Color ': ' Red ',' Background ': ' Black ',' Bor

The "C # 3.0 new features" are described earlier, and there is not much to be said about them, but in this way, a review of the new features of. NET 3.X. Auto Property (Automatic properties) It is useful to say that the property before the automatic property is a traditional attribute. Automatic properties simplify syntax, but also lose the ability to manipulate property settings when they are acquired, and to set initial values. If you want to rea

implements)There can be no final in an interface constant, and an abstract method can be without an abstract.When copying an object variable, the original variable references the same object as the copy variable. If you want to create a new copy of an object, its original state is the same as original, but you can change the state of each one later, you need to use the Clone method of the object class. The Clone () method in the object class is decorated with the protected modifier. This also m

handle stdout, and stderr will ignoreThe pipeline command must be able to receive data from the previous command as StdInSelect command Cut, grepCut: decomposes the same row of data-D: followed by delimited characters, used with-f-C: Remove a fixed character range in units of characters-F: Separates a piece of information according to-D and specifies which segment to takeCut is a piece of information that is taken out of a row, and grep is fetching a row on conditionSort commands: Sort, WC, uni

Copy the file/home/student/vimfile.txt to/home/student/longlisting.txt on the server. Use the VIM editor to change the/home/student/longlisting.txt file according to the following requirements:. Delete the file owner column. Do not remove any spaces.. Delete documents lines and pictures lines.Save the file when you are finished editing.Copy file/home/student/vimfile.txt to/home/student/longlisting.txt$ cp/home/student/vimfile.txt/home/student/longlisting.txtUse Vim to edit a file and play the be

^ Logical XOR is the same as false, different true, couple relationship.! False if not true, true if not false. False is true only if it is true: only it will short-circuit if the previous condition is not satisfied, the latter one will not execute at all|| Logical OR: There is true if true, except that it will short-circuit if the previous one is true and the latter one will not execute at all.1.5, bitwise operations (>> ^ One data for another data bit XOR or two times, the number does not cha

A thread is a different path in a programExample 1Only one pathEach branch is a threadIn fact, a computer can run only one process at a time, but because the CPU is running fast, we feel like we're working at the same time.Two ways to create a threadExample 1:Example 2:Inherit from threadUse interfaces as much as possibleThread State SwitchingBasic methods of threading controlSleep/join/yield methodTest 1Test 2Merge to a Main methodPriority of threads (not all)ExampleExampleHow to stop rightCurr

usage of the byte stream and the character stream is the same, the difference is that the byte stream and the character stream operate the different data units--byte stream operation is 8 bits of bytes, character streamThe operation is a 16-bit character. Byte stream mainly consists of InputStream and OutputStream as base class, while character stream is mainly composed of reader and writer as base class.node stream and process flow: a node stream to read and write data from a specific data sou

{/** * @paramuse of sleep, join, yield*/ Public Static voidMain (string[] args) {Runnable run=NewMyrun (); Thread Th1=NewThread (run); Myth Th2=Newmyth (); for(inti=0; i){ if(i!=25) {System.out.println ("Main Thread"); }Else{Th1.yield ();//Let the CPU out}} th1.start (); Th2.start (); Try{th1.join ();//Thread MergeTh1.sleep (1000*3);//Sleep 3 seconds}Catch(interruptedexception e) {e.printstacktrace (); } }}classMyrunImplementsrunnable{ Public voidrun () { for(inti=

* Thread_routine (void*Arg) {Pthread_detach (pthread_self ()); intconn = (int) Arg; Echo_sev (conn); printf ("exiting thread ... \ n"); return 0;}intMainintargcConst Char*argv[]) { intListen = socket (pf_inet, Sock_stream,0); if(Socket 0) Err_exit ("Socket"); structsockaddr_in servraddr; Servaddr.sin_family=af_inet; Servaddr.sin_port= Htons (5188); Servaddr.sin_addr.s_addr=htonl (Inaddr_any); intOn =1; //set up port multiplexing if(Setsocketopt (LISTENFD, Sol_socket, SO_REUSEADDR, on

1, identifiers are divided into three categories: keywords, predefined identifiers, user identifiers. Keywords have a special effect in C, so you can't use them like int, print, and so on. A predefined identifier is a pre-defined identifier that has a special meaning and cannot be used as a include,define, for example. A user identifier is a user-defined identifier that has the same naming rules and keywords, consisting of letters, numbers, and underscores, but the first word must be a letter or

7th Chapter7.13-1 Harmonic Average7.13-1 excise.cpp Harmonic Average#include Double Calculate (double a,double b);using namespace Std;Main (){Double x, y, Z;coutcin>>x>>y;while (x!=0y!=0){Z=calculate (x, y);coutcoutcin>>x>>y;}coutreturn 0;}Double Calculate (double a,double b){Double Z;z=2.0*a*b/(A+B);return z;}C + + Primer 6 Exercises (non-review questions)

release the memory. The thing to do with the delete is to call the destructor, then release the memory, and note that the delete frees the memory space instead of the destructor release. For class-type objects on the stack, the destructor is called automatically when the scope is exited, and then the memory is freed.Summary: For a class type object on a stack, like a built-in type variable, the system automatically frees the memory after the scope is exited. In fact, the difference between a bu

-parametric construction method Super(); } Public Usernotfoundexception (String msg) { // There is a constructor method Super(msg) ;custom exceptions are used in two ways: Violation of business logic: Public void F1 ()throws usernotfoundexception{ if(condition not satisfied) { Throw usernotfoundexception (' condition not satisfied '); }}Try--catch () Capture output: Public void F2 () { try{ // business code }catch(Exception e) { Throw New Usernotfounde

1.Formatted output:　　printf ("%-m.nf", a);where all of the formats are formatted as%-m.nf-: Stands for left alignment, default has right alignmentM: Represents the number of placeholders,N: Representing precision2.The form of the function definition　　int Add (x, y) int x, y; { int z; Z=x+y; return Z;}A different formint Add (int x,int y) { int z; Z=x+y; return Z;}3.Macro definition#define a BWhen the program compiles a simple character substitution, all calls t

----generate XML documents from XmlSerializerParsing xml: Document start, element start, text element, end of element, end of documentGenerate XML: Generate document declaration (document start), element start, text content, end of element, end of document1. Generate Simple XML2. Generating XML from Object data3. Generating XML from the object list dataTwo methods are extracted in the program-----1. The XML---list Object 2. The list object generates XMLCurd operations on the in-memory listHomewo

represented by the enumeration value can be cast, or the numeric value of an integer is converted to the enumeration value it represents.4. You can manually assign each enumeration member a value of the integer type it represents.5. Convert the string to the enumeration value Direction D = (Direction) enum.parse (typeof (Direction), str);6. The value of the enumeration corresponds to a value of type int by default, you can specify the type of the numeric value by appending a colon to the name o

First, the layout labelParagraph break: Horizontal:Second, block labelDifference: two consecutive div line breaks, two contiguous spans do not wrap, DIV+CSS, and span is often used for hints.Third, the text labelIv. List LabelFive, the picture label src as PathVi.. Link labelVii. Table LabelsEight, form labelsFormat:-----------------------------------Action: Form AddressMethod: How to submit: Get post put delete.The difference between get and post: When a get commits, the data is appended to the

members of an external class, but can be accessed through the new external class (). Members2. If the static member of the outer class is the same as the member name of the inner class, the static member of the external class can be accessed through the class name. static member; If the static member of the outer class is not the same as the member name of the inner class, the static member of the outer class can be called directly through the member name3. When you create an object of a static