break

What is a neat way of breaking out of many for loops at once?

由 偶尔善良 提交于 2019-12-18 11:24:59
问题 Suppose I need to break out of three or four nested for loops at once at the occurence of some event inside the innermost loop. What is a neat way of doing that? what I do is use flags like this: int i, j, k; int flag1 = 0; int flag2 = 0; for (i = 0; i < 100; i++) { for (j = 0; j < 100; j++) { for (k = 0; k < 100; k++) { if (k == 50) { flag1 = 1; flag2 = 1; break; } } if (flag1 == 1)break; } if (flag2 == 1)break; } I don't think this is particularly neat. How would you accomplish the same

In Java, how does break interact with nested loops?

由 做~自己de王妃 提交于 2019-12-18 10:32:56
问题 I know a break statement jumps out of a loop, but does it jump out of nested loops or just the one its currently in? 回答1: Without any adornment, break will just break out of the innermost loop. Thus in this code: while (true) { // A while (true) { // B break; } } the break only exits loop B , so the code will loop forever. However, Java has a feature called "named breaks" in which you can name your loops and then specify which one to break out of. For example: A: while (true) { B: while (true

Line ChartJS empty / null values doesn't break the line

由 风格不统一 提交于 2019-12-18 07:03:38
问题 I want to break the line of the chart when values is null or empty, but I can't. Perhaps I miss something? var data = { labels: ["January", "February", "March", "April", "May", "June", "July"], datasets: [ { label: "My First dataset", fillColor: "rgba(220,220,220,0.5)", strokeColor: "rgba(220,220,220,0.8)", highlightFill: "rgba(220,220,220,0.75)", highlightStroke: "rgba(220,220,220,1)", data: [65, null, 80, 81, 56, 55, 40] }, { label: "My Second dataset", fillColor: "rgba(151,187,205,0.5)",

Prevent xdebug to break at first line of index file

由 流过昼夜 提交于 2019-12-18 05:37:10
问题 I have xdebug setup with Eclipse PDT. Every time I start a debug session, Eclipse breaks at the first line of my root index.php file. Is it possible to prevent this behavior? 回答1: Ok I found what the problem was. In Eclipse, I just needed to go in "Windows -> Preferences -> PHP -> Debug" and uncheck "Break at first line". To make it work, I also had to go in "Run > Debug Configurations > PHP Web Application" and unselect "Break at first line" in all the configurations. You might have to

键盘扫描码（表格）

由 别等时光非礼了梦想. 提交于 2019-12-18 04:51:22
转载: http://www.mouseos.com/os/doc/scan_code.html 当按下一键时，产生 mark 码，产生一次 IRQ1 中断。 放开键时，产生 break 码，产生一次 IRQ1 中断。 因此： 当按下 A 键放开，实际上产生了两次 IRQ1 中断 break 是 mark 码的 bit7 置 1 得来，也就是： break = mark + 0x80 1、scan code 集 这里只说一般日常应用中的键盘码集 set 2（有 set 1、set 2 以及 set 3） 基本 scan code：绝大多数 scan code 是 1 byte 的。 扩展 scan code：由 e0 、 e1 或 e2 引导 特殊的 PrintScreen/SysRq 键： e0 2a e0 37 物殊的 Pause/Break 键： e1 1d 45 e1 9d c5 2、小键盘 scan code 表 key mark（Hex） break（Hex） 描述 NumLock 45 c5 break = mark + 0x80 / e0 35 e0 b5 由 e0 引导出 extend scan code * 37 b7 break = mark + 0x80 - 4a ca 同上 7/Home 47 c7 同上 8/Up 48 c8 同上 9/PgUp 49

Does `break` work only for `for`, `while`, `do-while`, `switch' and for `if` statements?

由 佐手、 提交于 2019-12-17 10:26:10
问题 Suppose, I have a if statement inside a for loop: for( ; ; ) { if( ) { printf(" inside if"); break; }//if printf("inside for"); }//for Now, will the break statement cause the compiler to come out of the for loop or will it only come out of the body of if once the condition in the if becomes satisfied? 回答1: The break statement breaks out of the nearest enclosing loop or switch statement . break does not break out of an if statement, but the nearest loop or switch that contains that if

HTML5 canvas ctx.fillText won't do line breaks?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-17 06:23:47
问题 I can't seem to be able to add text to a canvas if the text includes "\n". I mean, the line breaks do not show/work. ctxPaint.fillText("s ome \n \\n <br/> thing", x, y); The above code will draw "s ome \n <br/> thing" , on one line. Is this a limitation of fillText or am I doing it wrong? the "\n"s are there, and aren't printed, but they don't work either. 回答1: I'm afraid it is a limitation of Canvas' fillText . There is no multi-line support. Whats worse, there's no built-in way to measure

How to break out of a loop from inside a switch?

由 ≯℡__Kan透↙ 提交于 2019-12-17 05:37:30
问题 I'm writing some code that looks like this: while(true) { switch(msg->state) { case MSGTYPE: // ... break; // ... more stuff ... case DONE: break; // **HERE, I want to break out of the loop itself** } } Is there any direct way to do that? I know I can use a flag, and break from the loop by putting a conditional break just after the switch. I just want to know if C++ has some construct for this already. 回答1: Premise The following code should be considered bad form, regardless of language or

电脑屏幕适配各尺寸

由 邮差的信 提交于 2019-12-17 00:49:20
var width = document.body.offsetWidth; switch (true) { case width <= 1024: el.style.transform = "translate(220px,0)"; break; case width <= 1280 && width >1024: el.style.transform = "translate(320px,0)"; break; case width <= 1366 && width >1280: el.style.transform = "translate(360px,0)"; break; case width <= 1440 && width >1366: el.style.transform = "translate(400px,0)"; break; case width <= 1600 && width >1440: el.style.transform = "translate(500px,0)"; break; case width <= 1680 && width >1600: el.style.transform = "translate(550px,0)"; break; case width <= 1920 && width >1680: el.style

Bash break while loop by user input

由 假装没事ソ 提交于 2019-12-14 02:59:12
问题 I got me a little stopwatch which I put into bashrc with the following code: stopwatch() { date1=`date +%s` echo $1 while true; do echo -ne "$(date -u --date @$((`date +%s` - $date1)) +%H:%M:%S)\r" done } The ouput would look like this while the time would just count up in the second line: ~$ stopwatch test test 00:00:04 Now if I want to end the stopwatch I press Ctrl+C which gives me this: ~$ stopwatch test test ^C:00:03 I'd like to end the loop while containing its ouput using e.g. my enter
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