rtos programming

(1024) - Print(data) - + #4. Close -Phone.close ()Client 21 ImportSocket2 3 #1. Buy Mobile phone4Phone =Socket.socket (socket.af_inet, socket. SOCK_STREAM)5 #print (phone)6 7 #2. Dialing8Phone.connect (('127.0.0.1', 8080))9 Ten #3. Send and receive Messages One whileTrue: Amsg = input ('>>:'). Strip () - if notmsg: - Continue thePhone.send (Msg.encode ('Utf-8')) -data = PHONE.RECV (1024) - Print(data) - + #4. Close -Phone.close ()After the link loop, the server can provi

usage error, you can use the following code to prevent this situation1 phone.setsockopt (socket. Sol_socket, SOCKET. SO_REUSEADDR, 1)Four, when the client input is empty (that is, direct carriage return), press ENTER, the client has been across there,Cause Analysis:The client sends the empty information needs to call the operating system interface, the client program in memory to send the information to copy to the operating system memory, if empty, the operating system memory does not receive

responded to the cancellation request of the main thread after setting the Pthread_cancel_disable state to the new one.2.2 Types that can be canceledThe above-mentioned thread will check to see if it is canceled when it arrives at a cancellation point. This type of cancellation is also known as deferred cancellation. In addition, there is a cancellation type that is asynchronous cancellation. When a thread's cancellation type is asynchronous, the thread can be canceled at any time.A thread can

fraction, and calculate its decimal form. Outputs up to 200 digits after the decimal point, whether or not it can be removed.Input format:Shaped likeA/bTwo numbers, of which 10Output format:Shaped like0.xxxxxxxxxDecimal, up to 200 digits after the decimal point. The output ends with a carriage return with a newline. If A/b is a limited non-repeating decimal, then the output of all the valid bits will be able to, do not need to output the back of the 200-bit full.Input Sample:16/19Sample output:

Topic content:Each non-prime (composite) can be written as a number of primes (also known as prime numbers) in the form of multiplication, and these primes are called the composite's mass factor. For example, 6 can be decomposed into 2x3, and 24 can be decomposed into 2x2x2x3.Now, your program reads an integer in a [2,100000] range, then outputs its mass factorization, and when it reads a prime number, it outputs itself.Input format:An integer that is within [2,100000].Output format:Shaped like:

thousand part; If the hour is 0, there are no hundred parts, and if the hour is not 0 and the score is less than 10 points, 10 of the 0 bits are required, and 0 on 10 is not required if the hour is 10 and less than 0 points.Caution: Be careful with cross-day conversions.Input format:An integer that represents the time and minute of the BJT. The number of bits and 10 digits of an integer represents the minute, and the hundred and thousands denote hours. If the hour is less than 10, there is no t

Topic content:Your program reads a series of positive integer data, input 1 indicates the end of the input, and 1 is not the input data itself. The number of odd and even numbers in the data read by the program output.Input format:A series of positive integers in which the range of integers is (0,100000). If input-1 indicates the end of the input.Output format:Two integers, the first integer representing the number of odd numbers in the read data, and the second integer representing the number o

:%s (error%d) \ n", Strerror (errno), errno); Exit (0); } printf ("wait echo from server:\n"); Sleep (2); Recvsize= Recv (SOCKETFD, Recvbuf,sizeof(RECVBUF),0); if(Recvsize 0) {printf ("recvive Echo error:%s (error%d) \ n", Strerror (errno), errno); Exit (0); } printf ("%s", RECVBUF); Close (SOCKETFD);}Several issues encountered in this process:1, (client) errno 111:connection refusedThis problem indicates that the client did not find the port that should be connected and needed to: Ensu

out and was finally given the HTTP service. In this way, a piece of data is eventually delivered to the destination application. Of course, we still omit a lot of detail in this process. It is worth noting that the process of data communication is bidirectional, so the PC sends the webserver, in order for the service to interact properly, the data will return, so there is actually a data return process here we no longer analyze, the principle is similar. Top 0

and pseudo-random numbers (1) random numbers are randomly occurring, and there is no regular set of sequences. (2) True completely random numberThe column does not exist, it is just an ideal situation. We usually use random numbers to get a pseudo-random number sequence only through some algorithms. (3) We usually refer to random numbers, which basically mean pseudo-random numbers. 3.3.5.2, Linux random number correlation API (1) Multiple calls to the RAND function can return a pseudo-random nu

First, open the network communication port, choose the TCP protocol LISTENFD = socket (af_inet,sock_stream,0); Second, initialize the SERVADDR, and make the network byte sequence conversion Bzero (servaddr,sizeof (SERVADDR)); servaddr.sin_family = af_inet; SERVADDR.SIN_ADDR.S_ADDR = htonl (Inaddr_any); Servaddr.sin_port = htons (Serv_port); Third, bind IP and port Bind (LISTENFD, (struct sockaddr *) servaddr,sizeof (SERVADDR)); Iv. setting the number of monitoring links Liste

Network Debugging Tools Tcpdumpfunction : Print header information in the specified network interface that matches the Boolean expressionKey Words :① Type: Host (default), NET, port210.27. 48.2 // indicates that it is a host computer 202.0. 0.0 // indicates that a network at // indicate port number② confirm Transmission direction: SRC, DST, DST or SRC, DST and SRC210.27. 48.2 // the source address in the IP packet is this value 202.0. 0.0 // Destination network addres

Mm_text 1px Mm_lometric 0.1mm Mm_himetric 0.01mm Mm_loenglish 0.01 inch Mm_hienglish 0.001 inch Mm_twips 1/1440 inch Mm_isotropic User-defined value, but the X and y directions are equal (equal) Mm_anisotropic User-defined values, but the X and Y directions are arbitrary The mapping mode is set by a member function Setmapmode

prototype methods are added to the sub-class.Instance1.colors.push (' black '); Console.log (instance1.colors); // [' Red ', ' blue ', ' green ', ' black '] // [' Red ', ' blue ', ' green ']instance1.getname (); // CSSbook instance2.gettime (); // -Note: A subclass that wants to add a prototype method must pass a prototype object, one way to add it through the form of a point syntax, or it will be directly assigned to an object that overrides the inherited object from the parent class p

) * (1 + 0.00417); T=s; } System.out.println ("After six months, result is:" +s); }}2.16 Public classTest { Public Static voidMain (string[] args) {Scanner input=NewScanner (system.in); System.out.print ("Enter The amount of water in kilogram:" ); Doublem =input.nextdouble (); System.out.print ("Enter The initial temperature:" ); Doubleit =input.nextdouble (); System.out.print ("Enter The final temperature:" ); DoubleFT =input.nextdouble (); System.out.println ("The energy needed is" + M * (ft-i

in the processAsynchronous can be deleted (default is asynchronous and can be deleted at thread initialization)Sync to deleteGCC compilation for a program that contains threadsAdding-pthread to the compilation parametersThread ID and Process IDThe process ID is portable and is the unsigned int type.The thread ID is a non-portable type, that is, in this system, it may be the unsigned int type, in other systems may be long,double, or even a struct. So, for the sake of accuracy, when printed, it i

-to close the socket Connect Program1#include 2#include 3#include 4#include inch.h>5#include 6#include 7 8 intMain ()9 {Ten intsock,size; Oneuint16_t Port =8000; A Const Char*ip ="192.168.7.118"; - Charbuf[1024x768] ="Songlongfei"; - structsockaddr_in addr; thememset (AMP;ADDR,0,sizeof(addr)); -Sock = socket (Af_inet,sock_stream,0); -addr.sin_family =af_inet; -Addr.sin_port =htons (port); +Inet_pton (af_inet,ip,addr.sin_addr); - if(Connect (sock,structsockaddr*) addr,si

Datagramsocket ds =null;//Define the object that receives the datagrambyte[] buf =NewBYTE[1024];//Opens up space to receive data datagrampacket DP =null; // declaration Datagrampacket Object ds = new datagramsocket (9000); // client waits for server to send information on port 9000 DP = new Datagrampacket (buf,1024); //// receive data string str = new String (Dp.getdata (), 0, Dp.getlength ()) + "from" + Dp.getaddress (). Gethostaddress () +": "+ Dp.getport (); System.out.println (str); // outp

voidMain (string[] args) {System.out.print ("Enter A number:"); Scanner input=NewScanner (system.in); for(inti = 10000; I ) {System.out.println ("Pi (" + i + ") =" +COUNTPI (i)); } }}4.27 Public classTest { Public Static BooleanIsleapyear (intN) {return((n% 4 = = 0 n% = 0) | | n 400 = = 0); } Public Static voidMain (string[] args) {intn = 0; for(inti = 2001; I ) { if(Isleapyear (i)) {n++; if(n% 11 = = 0) {System.out.println ("\ n"); } Else{System.out.print (i+ " "); }

1 three digits in reverse order (5 points)Topic content:Three-digit number in reverse order:The program reads a positive three-digit number each time, and then outputs the number in reverse order. Note that when the input number contains the end of 0 o'clock, the output should not have a leading 0. For example, enter 700 and the output should be 7.Hint: With%10 can get single digit, with/100 can get hundred number .... The three numbers that are obtained are combined: Hundreds *100+ 10 bits *10+