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);Where array is the address of the first element of the incoming array, this is beneficial: saving time and memory for copying the entire array. There are also disadvantages: there is a risk of destroying the original data.Also, when passing an array, the length of the array needs to be passed separately, and the length of the pointer variable will be obtained using sizeof (array) in the function.To prevent changes to the original data, you can precede the parameter with the const keyword.1 voi

1.finally Public Static int func () { try{ return 1; } Catch (Exception e) { return 2; } finally { return 3; } } Public Static int func () { try{ thrownew Exception (); } Catch (Exception e) { return 2; } finally { return 3; } }The return value is 3, which indicates that the code of the finally block is executed before the normal return;Relationships between 2.java exc

Although I used Python to do several small sites behind the scenes, but did not touch all aspects of Python. This time to participate in the 51cto network of old boy Python operation and maintenance courses, to check the gaps.This blog post will be continuously updated to include the Python knowledge points I have omitted.April 5 ~ 11th: Under Linux, use the #!/usr/bin/python3Or#!/usr/bin/env Python3To specify the Python version to be used when the Python program is run Use the typ

= "Yes, I will be serialized, regardless of whether I am modified by the transient keyword"; @Override public void Writeexternal (ObjectOutput out) throws IOException {out.writeobject (content); } @Override public void Readexternal (ObjectInput in) throws IOException, ClassNotFoundException { Content = (String) in.readobject (); } public static void Main (string[] args) throws Exception {externalizabletest et = new externalizabletest (); ObjectOutput out = new ObjectO

. Jointstruct variable{ enum {INT, FLOAT, STRING} type; Union { int int_value; float Float_value; Char *String_char; 8 ;p rintf ("%d", V.value.int_value);}All members of a union refer to the same location in memory, and the Union is initialized in the same way as a bit segment, but must use the type of the first member to initialize the Union.Array:1. Character PointersCharMessage1[] ="Hello"A pointer array of length 6 will be createdChar*message2 ="Hello

of medium-quality factor 2 plus 1, so the problem is converted to n! The number of medium-quality factor 2, the same use of the conclusion:N. The number of mass factor k contained in: [n/k]+[n/k^2]+[n/k^3]+ ... (There will always be a T, making k^t>n, there is [n/k^t]=0)The code written in this way is as follows:int Lowest1 (int n) {int count = 0;while (n) {count + = N/2;n/= 2;} return count + 1;}The method has a time complexity of O (log2n) (here is the logarithm of the base N of 2)。 method Tw

\x8d\xa2 ' Xiao B ' \xe6\x99\x93 ' Army b ' \xe5\x86\ x9b 'Characters converted to byte classes can also be converted to charactersTurn byte p=bytes ("in", encoding= "Utf-8")Turn character d=str (p,encoding= "Utf-8")A=str () >>>>>>1. Creating a String 2. Converting to a stringA list or a tuple followed (can be iterated (with A For loop))Unique features of the list1, append (li) means append (can append string, list, meta-ancestor, dictionary)2, Extend () to expand their own, expand the content a

1. Hide all other Windows (hide)The window is too much too messy, press the COMMAND+OPTION/ALT+H key combination, except the current window other than the window will be automatically hidden (not shrink).2. Command XNote that you can only cut text and pictures, folders can not use shortcut keys to do the action3, the file right-click Copy, and Command C effect is different4. Screen shortcut keysFull screen: Command shift 3Custom Region screen: Command shift 45. Fast Switching applicationsCommand

Force delete all the. svn file directories below the item, find. -name '. SVN '-exec rm-rf {} \;EmptyDisplays all the blank files and displays the details: find. -emptySizeDisplay files of size 10k: Find. -size 10kShow all files larger than 10k: find. -size +10kOr, and, not, or, and, non-queriedFind files that are larger than 10k or contain a demo: Find. -size +10k-o-name ' *demo* 'Find files that are larger than 10k and less than 100k: find. -size +10k-a-size-100kFind files larger than 10k with

in the red-black tree moves relative to the left and is prioritized.Process scheduling is based on the ready queue, and the waiting process in the ready queue is an executable state. While the sleep process is in the waiting queue, processes in the wait queue are not selected by the scheduler. When the sleep process wakes up, it goes into the ready queue. There are two kinds of sleep processes, which can be interrupted and non-disruptive. There are several ways to wake up a process that waits f

1. View system architecture and kernel information1>uname [Options]Common options:-I display System hardware platform-m display host CPU name-N Display node name-O Display Operating system name-p Display System processor architecture-R Displays the release version number of the operating system-S display system name-V Show kernel version-A display system architecture and kernel information2>LSB_RELEASE-D Display System version informationThe information that displays the/etc/redhat-release file

Cstr=lpctstr; How to convert a string between Unicode and ANSIThe Windows function MultiByteToWideChar is used to convert a multibyte string into a wide string; the function WideCharToMultiByte converts a wide string into an equivalent multibyte string.CString-->char *CString str1 =_t ("123"); int len = WideCharToMultiByte (cp_acp,0,str1,-1,null,0,null,null); char *ptxttemp = new Char[len + 1]; WideCharToMultiByte (Cp_acp,0,str1,-1,ptxttemp,len,null,null);//...delete[] ptxttemp;char *-->cs

1 program = algorithm + data2 Structured programmingC Process oriented Emphasis algorithm3 Object-Oriented programmingC++ Object orientedEmphasis on dataA class is a specification that describes the format of the dataclass = data + Algorithm + Object-oriented three major features (encapsulation, inheritance, polymorphism)4 Generic ProgrammingIndependent of data type Emphasis algorithm5 sizeofsizeof is an operator, the type must be parentheses, the variable brackets are optionalFor example:Long L

Square00000001 = = = one characterUniversal code AH: Unicode includes all countries16 bytes Represents a character00000001 00000001 = = 2 of a character 16 Times SquareChange: 4 byte table one character is 32 times11111111 11111111 11111111 11111111 represents a byte 2 of the 32-time SquareWaste of resources:Upgrade Utf-8: Minimum 8-bit:English 8 bit one byte, 00000001Europe 16 bits Two bytes, 00000001 00000001Asia 24 bits Three bytes, 00000001 00000001 00000001Python3 under:Binary between diff

method to implement the merging and splitting of the array. The Copy method has four overloads, namely:(1) Array.copy (array 1, array 2, length) Int32(2) array.copy (array 1, array 2, length) Int64(3) array.copy (array 1, specified index, array 2, specified index, length) Int32(4) array.copy (array 1, specified index, array 2, specified index, length) Int64example, implementing merging arrays 1 and Arrays 2 array 3, splitting array 2 to array 4The result of the output is: merging the elements o

condition, and the relationship is.) such as status=2)customer_list = models. Customer.objects.filter (Q (recv_date__lt=) | Q (Last_consult_date__lt=no_follow), status=2)Way two:q1=Q () q1.connector="OR"Q1.children.append (('ID', 1)) Q1.children.append ('ID__GT', 3))#Q1 requires id=1 or id>3, example: models. UserInfo.objects.filter (Q1)Q2=Q () q2.connector="OR"Q2.children.append (('Title__contain',"High")) Q2.children.append ('nid', 2))#in Q2, the title field is required to contain "high" or n

/version Status codeExample: http/1.1 304 not ModifiedStatus code:1XX: In Request2XX: Request Response CompleteCommon 200 Response success3XX: Further browser operation is requiredCommon Status Codes:304: The file does not change, please look for the cache302: Still need to turn4XX: User Operation error404: The resource found does not exist5XX: Server Error500: Server ErrorResponse headerCommon response Headerslocation:http://www.augmentum.com/index.jsp--Jump directionServer:apache Tomcat-Server

containers Some basic operations, such as begin and end members, insert operations, resize operations, erase operations, assign operations, relational operators, and so on. Self-growth of vector containers The vector class provides two member functions: Capacity and reserve, which gets the total number of elements that can be stored before the container needs to allocate more storage space, which tells the container how much space should be reserved. Note that capacity is

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system, he must have inode table and b The two areas of lock area.Inode record information (of course, more than that):? The owner and group of the file (Owner/group);? The access mode of the file (Read/write/excute);? The type of the file (type);? The time the file was established or changed (CTime), the last Read time (atime), the time of the recent change (mtime);? The capacity of the file;? Flags (flag) defining the profile characteristics, such as SetUID ...;? The direction of the real con