What is multi-channel distribution:
Java only supports single-path distribution, that is, if the operation to be executed contains more than one unknown object of type,
The dynamic binding mechanism can only process one type in the process,
If you need to process two types, you can use multiple channels for distribution,
To use two-way distribution, you must have two methods:
The first method call determines the first unknown type,
The second method call dete
equivalent to (. * (. pF [0]) ();. Therefore, the length of structure A is 8 bytes. Let's look at the following code:
Struct B: public A {long B; void ABC () ;}; struct C: public A {long c; virtual void
ABC ();};
Struct BB: public B {long bb; void ABC () ;}; struct CC: public C {long cc; void
ABC ();};
Void main () {BB bb
::p f by giving the ordinal number of the A::ABC in a::p F; A.ABC (); will be equated (a.* (a.pf[0)) ();. So the length of structure A is 8 bytes, and then look at the following code:
struct B:public A {long B; void ABC ();}; struct C:public A {long C; virtual void
ABC (); };
struct Bb:public B {long BB; void ABC ();}; struct Cc:public C {long CC; void
ABC (); };
void main () {BB
First of all: the scope of JS is different from the scope of other languages, pay special attention to
The concept of scope in JS:Represents the area in which a variable or function works, referring to the context in which they are executed, i.e. the context execution environment. There are only two scopes for javascript: global scope and local scope, and local scopes are distinguished by functions.First look at several topics:1.Copy CodeThe code is as follows:if (true) {var aa= "
containing an array, an object, the connection remains intact.
Join
To connect an array to a string by using the specified spacer character:
Copy Code code as follows:
var a = [' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' G '];
Lert (A.join (",")); -> a,b,c,d,e,f,g equivalent to a.tostring ()
Alert (A.join ("X")); -> A x B x C x D x E x F x G
This is easy to understand, but it is important to note that only a one-dimensional array is converted, and if there is an ar
The first prize in the world Programming Competition-general Linux technology-Linux programming and kernel information. The following is a detailed description. Save the following text as 1.txtand Add the above content.
Open a DOS window and enter
Debug You get a 1.com program and run it.
The screen is a scenario where the game is turned around (Descent!
E100 33 f6 bf 0 20 b5 10 f3 a5 8c c8 5 0 2 50 68 13 1 cb e 1f be a1 1 bf 0 1
E11b 6 57 b8 11 1 bb
Save the following code as *. txt (named by yourself) and run debug Code compressed
There is a self-resolving program in it, and it starts to be self-resolved.
E100 33 F6 BF 0 20 B5 10 F3 A5 8C C8 5 0 2 50 68 13 1 CB e 1f be A1 1 BF 0 1
E11b 6 57 B8 11 1 BB 21 13 89 7 4B 4B 48 79 F9 ad 86 E0 8B C8 bd ff E8 20
E134 0 3D 0 1 74 1A 7f 3 aa eb F3 2D FF 0 50 E8 F 0 5A F7 D8 8B D8 26 8A 1 aa
E14f 4A 75 F9 EB de CB 57 B
[Figure] the first program in the world Programming Competition (I tried it, really
(Copy the following code to save it as a document with the name 1.txt, and place it under c: \ Documents and Settings \ Administrator)In the command line window (find the "run" column in the "Start" menu and Enter cmd to enter the inventory Letter of the document. You can see c: \ Documents and Settings \ Administrator>, enter debug To exit, press the Windows key)
E100 33 F6 BF 0 20 B5 10 F3 A5 8C C8 5 0 2 50 6
dependent Library. Code is located in the com.facebook.soloader.MinElf extract_dt_needed method, the code is longer, we step by step to see: ByteBuffer bb = ByteBuffer.allocate(8/* largest read unit */); // Read ELF header. bb.order(ByteOrder.LITTLE_ENDIAN); if (getu32(fc, bb, Elf32_Ehdr.e_ident) != ELF_MAGIC) { thrownew ElfError("file is not ELF"); }First read the elf file header infor
Copy the snippet code (starting from E100 to the last Q) and save it as a text document named 1.txtI saved it to D-plate.Using the "debugGenerates an executable program.Enter is a 3D game rotation interface, there is a beautiful music, really cow ...Let's go check it out.Ensure the executable, to ensure non-toxic ...
E100 f6 Bf 0 B5 f3 A5 8c C8 5 0 2 1 CB E 1f be A1 1 BF 0 1e11b 6 B8 1 BB 7 4b 4b F9 ad E0 8b C8 BD FF FF E8 20e134 0 3d 0 1 1a 7f 3 AA
Copy this machine language code into Notepad, save Ytlds.txt, hide the file name ytlds in the extension, create a new batch file under the same folder, enter
echo offDebug Run the batch file will run the program automatically, the generated program is 4KB, the program is running under DOS.A scene animation, and music.E100 f6 Bf 0 B5 f3 A5 8c C8 5 0 2 1 CB E 1f be A1 1 BF 0 1e11b 6 B8 1 BB 7 4b 4b F9 ad E0 8b C8 BD FF FF E8 20e134 0 3d 0 1 1a 7f 3 AA
The concept of scope in JS:
Represents the area in which a variable or function works, referring to the context in which they are executed, that is, the context execution environment. JavaScript has only two scopes: global scope and local scope, and local scope is differentiated by function.
First look at a few questions:
1.
Copy Code code as follows:
if (true) {
var aa= "BB";
}
Console.log (AA);
The concept of scope in JS:
It indicates the region where variables or functions work. It refers to the context in which they are executed, that is, the context execution environment. There are only two types of Javascript scopes: global and local scopes. Local scopes are differentiated by functions.
First, let's look at several questions:
1.Copy codeThe Code is as follows: if (true ){Var aa = "bb ";}Console. log (aa); //
Let's talk about the basics:The file location is as follows:1. Judge whether it is a file or a directoryVar_dump (FileType ("./aa/bb/cc.txt"));Output: String (4) "File"Output: String (3) "Dir"2. Determine if it is a file (return ture)Var_dump (Is_file ("./aa"));output bool (FALSE)3. Determine if it is a directory (return ture)Var_dump (Is_dir ("./aa"));Output: bool (TRUE)4, the file access, creation and modification timeecho Date ("Y-m-d h:i:s", Filea
Full-Text IndexingBuild method:--Create a full-text index on the key field of the articles collection Db.articles.ensureIndex ({key: "text"})--Key_1,key_ in the articles collection 2 Create full-text index on field db.articles.ensuereIndex ({key_1: "text", Key_2: "Text"})-- Create a full-text index on all fields of the articles collection Db.articles.ensuereIndex ({"$**": "Text"})--Create a full-text index on the article field in the Articles collection > Db.articles.ensureIndex ({"article": "Te
The scope in Js is different from that in other languages. Pay special attention to the concept of scope in JS:
It indicates the region where variables or functions work. It refers to the context in which they are executed, that is, the context execution environment. There are only two types of Javascript scopes: global and local scopes. Local scopes are differentiated by functions.
First, let's look at several questions:
1.
The Code is as follows:
If (true ){Var aa = "
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