robot chapter 5 summary

8th IO Library1. Io Class inheritance Relationship:2. Query iostream stream Status p280-281V is an int, when we enter 1, ' r ', or CTRL + Z when the output is as follows:cin.clear () can clear all error bits so that the good () returns True.3. FStream to read and write files P284After the initial creation of the read-in and write-out FStream objects, the fin and fout are treated as CIN and cout completely, and their operations are almost indistinguishable.4. An unpredictable bug occurs when you

UITableViewCell(2) Rewrite Initwithstyle:reuseidentifier: MethodAdd all the child controls that need to be displayed (you don't need to set the child control's data and frame, and the child controls are added to the Contentview)One-time property setting for child controls (some properties need to be set only once, such as fonts \ fixed images)(3) 2 models availableData model: Storing text data \ Picture dataFrame model : The height of the Frame\cell that holds the data model \ All child co

UITableViewCell(2) Rewrite Initwithstyle:reuseidentifier: MethodAdd all the child controls that need to be displayed (you don't need to set the child control's data and frame, and the child controls are added to the Contentview)One-time property setting for child controls (some properties need to be set only once, such as fonts \ fixed images)(3) 2 models availableData model: Storing text data \ Picture dataFrame model: The height of the Frame\cell that holds the data model \ All child controls

ImportJava.io.PrintWriter;7 8 /**9 * Created by Administrator on 2015/6/2.Ten */ One Public classFirstservletextendshttpservlet{ A - Public voidService (httpservletrequest request,httpservletresponse response) - throwsservletexception,ioexception{ the -PrintWriter out =Response.getwriter (); -Out.println ("); -Out.println ("); +Out.println ("NewJava.util.Date () + "); -Out.println ("); + } A}Configuration We just don't have the servlet class file, because we want the Web se

$what ='steak'; Print " Fred ate $n ${what}s.\n ";Boolean valueIf the number 0 is false, if it is an empty string ' false,If it is not a number or a string, turn it into a number or string before judging. The string ' 0 ' is also falseGet user input$line = Remove the rightmost line break$text ="a line \ n"; Chomp ($text); Print $text;undef valueIf the data is quite undef the value is 0, if it is added to the string, it is empty.Defined functionIf you want to determine if a string is undef instea

plug-in to transfer the local instance profile to each node and replace the original configuration file. Restart the Nagios service. 8. Structure: 9. Centreon+nagios configuration file: Defining hosts /usr/local/nagios/etc/hosts.cfg defining a host template /usr/local/nagios/etc/hosttemplates.cfg Defining host Groups /usr/local/nagios/etc/hostgroups.cfg Defining Services /usr/local/nagios/etc/services.cfg Defining service Groups /usr/local/nagios/etc/servicegroups.cfg Defining Commands /usr/l

) in addition to the remainder of this number 5%3=2 10%2=0Shift Operator: Shift Left (") multiplied by 2 n Power shifted right (") divided by 2 n power3 "5;3*2*2*2*2*2 40" 3; 40/2/2/2Boolean operator; | | These two operators will short-circuit the first false, and the second will not be computed | No short circuit, two of them are counted.^ different or the same is false, the difference is true ~ non-~0=-1 take the opposite number minus 1Trinocular op

,%s'%(greeting, name)>>> Hello_2 ('hi') Hi, World3) variable number of parametersdef print_params (*params): print params>>>print_ params (' testing') ('testing',)>>> Print_params (1, 2, 3) (1, 2, 3)As can be seen from the above example, a tuple is printed. If used in conjunction with common parametersdef Print_ params_2 (title, *params): print title Print params >>> print_params_2 (' params: ' 1, 2, 3) params: (1, 2, 3)>>> Print_ Params_2 (' Nothing: ') Nothing: ()But you can't ha

languageDeclaration does not add typeData types that can be stored5.Numeric OperatorsIn the comparison operator= = = Congruent, requires the same data type!== strictly unequal,5!==2+3:false ' 5 '!==2+3:true equals = = = Take counterIt is recommended to use = = = and !== instead of = = and ! =, resulting in fewer errors6.StringSingle and double quotes are the same, but it's best to stick to habitescaped:\ '

exists. otherwise returns falseOs.path.isdir (path) returns True if path is a directory that exists. otherwise returns falseOs.path.getsize (path) Statistics file size in bytesOs.path.join (' A ', ' B ', ' C.txt ') is returned after combining multiple paths, and the parameters before the first absolute path are ignoredDo not write path charactersOs.path.normpath (path) normalize the path, put the inside of the slash the same, ... （.. Returns the previous layer symbol) execution, etc.The absolut

* 16 + offset addressYou can use the segment address and offset address to synthesize the physical address. The essential meaning of "segment address * 16 + offset address = physical address" When the CPU accesses the memory, it adds a base address (segment address * 16) and an offset address relative to the base address to give the physical address of the memory unit. Segment Concept When programming, you can think of memory units with consecutive addresses as a segment, and use segment addr

Returned directory Summary Discussed the structure andIlHow the compiler generates these filesIlThe compiler creates a managedPEFile steps.PEThe file is created as follows:4Steps: Procedure1: Initialization 1.Initialize internal buffer 2.CreatePEEmpty file template, includingMS-DOSHeader andStub,PESignature,CoffHeader andPEHeader. 3.Input address table andCLRHeader is allocated in. TextSection. Procedure2:Source codeSyntax analysis

Chapter I. , First Knowledge Java1. 1.Java is a programming language, a development environment, an application environment, a deployment environment.2.Java Features: Simple, object-oriented, distributed, secure, stable, interpretive, multi-line, dynamic language.The 3.Java technology platform has three types of(1) Javase (Java Platform Standard Edition): It is a version developed by Sun for desktop development and low-end business computing, designed

Space 5, in order to detect, correct and prevent signal integrity problems, the physical design must be converted into an equivalent circuit model and this model to simulate the waveform, in order to produce the product before the prediction performance.6, the use of three levels of analysis accumulated electrical effect-the rule of thumb, the analysis of myopia and numerical simulation tools, which can be applied to modeling and simulation.7, the m

1 the Java IO Class library constructs and provides a mechanism for various types of streams and the creation of flows to complete the reading and writing of different devices.2 according to the direction of the data flow, you can divide the flow into the input stream and the output stream, according to the smallest difference of processing data can divide the stream into byte stream and character stream according to Liu's function and role can be divided into low-level and advanced flow two cat

descriptor table entry OLDFD to the Descriptor table entry NEWFD, overwriting the previous contents of the Descriptor Sheet table entry newfd. If the NEWFD is already open, Dup2 will close NEWFD before copying the OLDFD.#include int dup2(int oldfd,int newfd);8 Standard I/OThe standard I/O library models an open file as a stream, which is a pointer to the structure of the file type.#include *stdin; /*标准输入，文件描述符为0*/extern FILE *stdout; /*标准输出，文件描述符为1*/extern FILE *stderr; /*标准错误，文件描述符为2*/A strea

indicate no temperature, and will not prevent the temperature continue to decrease. And so the proportion table is determined by 0 points, this 0 point is not arbitrarily determined, but a meaningful value, represents theVariable without measurement (not present at all)Problem:1, a local fast food restaurant has a small, medium and large-scale beverage, measuring the size of the beverage table type is what? Order2. In a study of facial expression perception, subjects were asked to classify the

performed.For example, on a 16-bit machineint a = 5000;int b = 100;long C = A * b;Overflow will occur and the result of a * B needs to be converted to a long integer.int a = 5000;int b = 100;long c = (long) a * b;8. Writing the result depends on the evaluation order of the expressionThe order of evaluation of an expression is affected by three factors: Precedence of Operators The associativity of Operators Whether the operator controls the order of execution The precedence

. Hibernate: Call the Sleep () method, give him a number of milliseconds, and execute after this time.4.D Wait state: The wait method in object and the Notify method, waiting and waking are used in general.5. Pending state: Forces a thread to exit the yield () method.Thread synchronization (synchronized) Sync lockWhen sometimes two or more threads may try to access a resource at the same time, in which case the data may become inconsistent, in order t

13.1 You can use a is B to determine if object A is a B type, and the return value is a Boolean value 13.2 As can convert ordinary types, such as double,int,cgfloat, to convert 13.3 can use as? Convert the same to a parent class, the result can be nil or transformation success, so the result is an optional type, the conversion after successful use?. To access a method or property, or to make an optional binding. 13.4 If an object can be converted successfully, it can be con