oanda practice

Practice content:Determine if a tree is a search binary tree.Body Content Summary:1. Create a class to implement a doubly linked list and basic stack structure.2. Create a class to represent a binary tree.3. Determine whether a tree is a recursive and non-recursive implementation of a search binary tree.4. Simple test, verify correctness.1. Create a class to implement a doubly linked list and basic stack structure. The code is as follows:classdoubleli

Disk MBR partitioning in Linux--Practice of FDISK command syntaxFDISK (options) (parameters)Options-b l 列出分区表信息-v 显示版本信息ParametersDevice files: e.g./DEV/SDAInstanceSelect the disks you want to manipulate:[root@vathe ~]#fdisk /dev/sdbEnter m to list the commands that can be executed:Command (M forHelp):McommandAction A toggle a bootable flag B edit BSD DisklabelC Toggle the DOSCompatibility flagDDelete aPartition # Deletin

LAMP/LNMP Stage Practice Linux Common service Deployment and optimizationWe review them in the form of simulated actual needs. The requirements are as follows:1. Prepare two CentOS 6, one machine running MySQL, another machine running Apache and Nginx + PHP2. Install Apache and Nginx at the same time, which Nginx start 80 port, used to run static objects (image, JS, CSS), Apache listening 88 port, is responsible for running dynamic pages (PHP related)

some time ago also learned a lot of network-related knowledge, but also through a variety of practices. But it never starts with a real workout from scratch. Please try it today. The following is a detailed record of this process. This includes a partial understanding of the network and a record of the problems encountered. Practice Content and Purpose:1, using the bridge mode, the multiple Linux virtual machines are bridged together. (if there is a p

To exercise your Java coding capabilities, plan to do three more complete projects, namely:1.OA System Wisdom Podcast Soup Sunshine Edition;2. The e-shop is also the teacher's name of the Preach Wisdom podcast forgotten;3.BBS Academy Horse Soldiers;This group of essays is to follow up on the progress of these three projects, to document the problems encountered during the practice, the solutions, and the experience.Hope that through their own efforts,

Practice content: Create classes dynamically using type1 __author__='Orcsir'2 3 4 @classmethod5 defClass_method (CLS):6 Print("I am Class_method ...")7 8 9 @staticmethodTen defStatic_method (): One Print("I am Staticmethod ...") A - - def __init__(self, x, y): theself.x =x -SELF.Y =y - - + defFool (self): - Print("I am fool ....") + A at #type (name of the class, - #tuple of the parent class (for inheritance, can is empty), - #dictio

Practice content: Socket,io multiplexing, Python Selectors library for simple group chat.1. Service-side Code1 __author__='Orcsir'2 ImportSelectors3 ImportThreading4 ImportSocket5 fromCollectionsImportNamedtuple6 7 8 classChatserver:9 def __init__(Self, ip="0.0.0.0", port=9527):TenSELF.ADDR =(IP, port) OneSelf.sock =Socket.socket () ASelf.selector =selectors. Defaultselector () -Self.data = Namedtuple ("Data", ["Callback","Datagram"]) - the

Linux OPS Practice case-December 20, 2015-December 31 (first time)1. Create a 10G file system, type ext4, requires the boot can be automatically mounted to a separate data /data directory; Create a 10G partition [Email protected] ~]# FDISK/DEV/SDAWarning:dos-compatible mode is deprecated. It ' s strongly recommended toSwitch off the mode (command ' C ') and change display units toSectors (Command ' u ').Command (M for help): Nformat type is ext4 [Em

Linux OPS Practice-November 8, 2015-November 17 course Assignments (exercise) SummaryI. Homework (exercise) content:First, Iptables class workPremise: Input and output default policy is drop;1. The Web server that restricts the local host is not allowed to access in Monday; the rate of new requests cannot exceed 100 per second; The Web server contains the admin string and the page is not allowed; The Web server only allows the response message to leav

I. Homework (exercise) content:1, build lamp environment, and practice based on DNS to do domain-based virtual host.650) this.width=650; "title=" phpmyadmin.jpg "style=" Float:none "src=" http://s4.51cto.com/wyfs02/M02/7D/E5/ Wkiom1byphntbzndaafyt9hti-a951.jpg "alt=" Wkiom1byphntbzndaafyt9hti-a951.jpg "/>650) this.width=650; "title=" pmafish.jpg "style=" Float:none "src=" http://s1.51cto.com/wyfs02/M00/7D/E5/ Wkiom1byphma2lcsaabqaied9_k987.jpg "alt="

Linux OPS Practice-August 30, 2015 Course assignments 1, summarize the text editing tool vim use method; Vim: Full-screen editor; Vim's editing mode: Edit mode: Command mode; The two meanings are probably the same. Input mode, last-line mode. Edit mode (switch to) input mode: Insert:i Append:a New Line:o Beginning of line: I End of line: A New row above: O Input mode à edit mode: Esc Edit mode, last-line mode: ： Last-line mode à edit mode: Esc How to

springboot2.x Best Practice PrefaceThis series of articles, from zero-based contact springboot2.x to new releases, basic introductory use, hot deployment, to the integration of various mainstream frameworks redis4.x, Message Queuing acivemq, ROCKETMQ, etc., Search Framework ElasticSearch5.6 version, to Web-flux reactive programming, to actuator monitoring application information, official best practices, the most complete SpringBoot2. TutorialsTechnic

first n items of the following sequence. Fibonacci Cut1 1 2 3 5 8 13 21 34 55 89 ...A b RETA b RETA b RETA b RETif (n{A = 1;b = 1;}Else{ret = a + b;printf ("%d", ret);A = b;b = ret;}Key: Ask for each itemThe law of Cycle start:Loop End:Loop increment:2. Reverse output The binary of the specified number1010 Output 010110%2 5 05%2 2 12%2 1 01%2 0 1The law of Cycle start:Cycle conditions:Loop increment:3. Enter an integer (int range) to shape the number and output in reverse order.1234-----> 4 3 2

First, the grammaruntil [Condition] # and while on the contrary, when the condition condition is established, the loop is terminated, or the program segment that continues the loop does #执行内容done Second, practice Enter the user input parameters until the user enters "end" to end the loopUntilread-p "Plz input a Paramter": paramtest $param = "End" Doecho "$param" Done[Email protected]:~$./test.shPlz input a paramter:aaplz input a paramter:bb

Signal ClassificationUnreliable signalThe Linux signaling mechanism is basically inherited from Unix systems. The signaling mechanism in the early Unix system was relatively simple and primitive, and later exposed some problems in practice, and its main problems were:1. Each time the process processes the signal, the response to the signal is set to the default action. In some cases, it will cause error handling of the signal, so if the user does not

/MSGRCV, Message Send/Receive practice **///1. Message sent int main () {int msgid = Msgget (0x1234,0666| Ipc_creat); if (MsgId = =-1) err_exit (" msgget error"); struct msgbuf mybuffer; for (int i 2. Message reception: The data is constantly taken from the head of the team int main (int argc, char *argv[]) { int msgid = msgget (0x1234, 0); if (MsgId = =-1) err_exit ("Msgget error"); struct MSGBUF buf; ssize_t NRCV; while (

) err_exit ("Msgget error"); struct Msqid_ds buf; if (Msgctl (msgid,ipc_stat,buf) = =-1) err_exit ("Msgctl error"); printf ("Buf.msg_perm.mode =%o\n", buf.msg_perm.mode); %o print printf in octal ("Buf.__key =%x\n", Buf.msg_perm.__key); %x is printed in hexadecimal cout /** Practice: Ipc_set, generally need to get first, and then set **/int main () { int msgid = msgget (0x255, 0); if (MsgId = =-1) err_exit ("Msgget erro

Introduction and practice of special permission bits for Linux files and directoriesIn Linux, both Superuser root and normal user can use the command "passwd" command to modify their password, but everyone who knows Linux know that the Linux password is stored in the /etc/passwd/etc/shadowCheck permissions with ls-l/etc/passwd/etc/shadow[Email protected] ~]# ls-l/etc/passwd/etc/shadow-rw-r--r--.1 root root 1497 March 21:15/etc/passwd----------. 1 root

Practice content: Use two ways to implement dictionary access attribution: Use a class wrapper dictionary so that the dictionary does not use [] to access the element, use the. Dot number to access the element as if it were a property.Mode one: direct manipulation of instance dictionaries in __init__1 __author__='Orcsir'2 3 #Way One4 classattrdict:5 def __init__(self, attrs:dict):6 #direct manipulation of instance dictionaries to avoid the