break | 易学教程

how to exit nested loops

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问题 i have something like while(playAgain==true) { cout<<"new game"<<endl; //i know 'using namespace std;' is looked down upon while(playerCard!=21) { *statements* if(decision=='n') { break } ... } } but that break only breaks out of the first while loop when I want to break out of both of the loops 回答1: Don't cook spaghetti and extract your loops into the function: void foo(...) { while (...) { /* some code... */ while (...) { if ( /* this loop should stop */ ) break; if ( /* both loops should

Simple while loop until break in Python

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问题 What would a very simple while loop statement be that would continue the below program until the user types "exit"? For example, while response = (!'exit') continue file else break print ('Thank you, good bye!') #I know this is completely wrong, but it's a try! My file so far: #!/usr/bin/python friends = {'John' : {'phone' : '0401', 'birthday' : '31 July', 'address' : 'UK', 'interests' : ['a', 'b', 'c']}, 'Harry' : {'phone' : '0402', 'birthday' : '2 August', 'address' : 'Hungary', 'interests'

Simple while loop until break in Python

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What is the best way to force a try block to break in between?

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问题 I have a try - catch block that I wish to break like a switch block but I couldn't find a recommended way of doing it. I'm fetching a lot of data in the try - catch block and wish to stop the fetching in between in case a certain condition is met. Just to get it working for now, I've deliberately forced the code to go into the catch block: int i=0; try { //--do stuff---- if(//-------is condition met?--------//) i = 1/0; // divide 1 by 0 -- a definite exception } catch (Exception e) {//-------

C++ cin keypress event

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问题 I believe this is a very simple question, but I can't find a simple answer to it. I have an infinite loop, e.g. while(1) , for(;;) , and I need to break from the loop on a keypress. What is the easiest way to do this? P.S.: I can't use getch , cin.ignore , or cin.get because it stops the loop. 回答1: Well, what you want is asynchronous input. All of the methods provided by cin wait for enter. You will have to use system-specific functions for that, or use a library that will do it for you. What

nginx.conf配置

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#user nobody; worker_processes 1; error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info; pid logs/nginx.pid; worker_rlimit_nofile 10240; events { use epoll; worker_connections 10240; } http { include mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; #access_log logs/access.log main; sendfile on; #tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; gzip on; gzip_static on; gzip_http_version

Break PHP array into 3 columns

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问题 I'm trying to break a PHP array into 3 columns (has to be columns, not rows) so it would look something like this: Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Item 8 Item 9 Item 10................ The best approach I can think of would be to break the main array into 3 arrays, 1 for each column although I can't work out the best approach to do this - more specifically the criteria I could use to generate the 3 arrays. 回答1: I would use this: $i = 1 foreach ($array as $value) { if ($i % 3

细说PHP文件上传类fileupload.class.php，很好用

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<?php /** file: fileupload.class.php 文件上传类FileUpload 本类的实例对象用于处理上传文件，可以上传一个文件，也可同时处理多个文件上传 */ class FileUpload { private $path = "./uploads"; //上传文件保存的路径 private $allowtype = array('jpg','gif','png'); //设置限制上传文件的类型 private $maxsize = 1000000; //限制文件上传大小（字节） private $israndname = true; //设置是否随机重命名文件， false不随机 private $originName; //源文件名 private $tmpFileName; //临时文件名 private $fileType; //文件类型(文件后缀) private $fileSize; //文件大小 private $newFileName; //新文件名 private $errorNum = 0; //错误号 private $errorMess=""; //错误报告消息 /** * 用于设置成员属性（$path, $allowtype,$maxsize, $israndname） * 可以通过连贯操作一次设置多个属性值 *@param

Break statement inside two while loops

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问题 Let's say I have this: while(a){ while(b){ if(b == 10) break; } } Question: Will the break statement take me out of both loops or only from the inner one? Thank you. 回答1: In your example break statement will take you out of while(b) loop while(a) { while(b) { if(b == 10) { break; } } // break will take you here. } 回答2: It will break only the most immediate while loop. Using a label you can break out of both loops: take a look at this example taken from here public class Test { public static

Break out of proprietary toolbox after a given time

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问题 I am iterating through a large test matrix in MATLAB and calling second-party proprietary software (running in MATLAB) each time. I cannot edit the software source code. Sometimes, the software hangs, so I want to exit it after a certain amount of time and move on to the next iteration. In pseudocode, I'm doing this: for i = 1:n output(i) = proprietary_software(input(i)); end How can I skip to the next iteration (and possibly save output(i)='too_long' ) if the proprietary software is taking