break | 易学教程

How do exit two nested loops? [duplicate]

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问题 This question already has answers here : How do I break out of nested loops in Java? (35 answers) Closed 3 years ago . I have been using Java for quite some time, yet my education in loops is somewhat lacking. I know how to create every loop that exists in java and break out of the loops as well. However, I've recently thought about this: Say I have two nested loops. Could I break out of both loops using just one break statement? Here is what I have so far. int points = 0; int goal = 100;

How to send interrupt key sequence to a Java Process?

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I've got a handle to a Java Process instance and its associated streams. It's a console program. I'd like to simulate a break sequence. On Windows this is Ctrl-C. Is this possible without natives? The reason for doing this: the console program is a command-line console itself, controlling a virtual machine for another language. The user can run another program from this console program. While a program is running, the break sequence will interrupt execution of the underlying program and cause the console program to go into debug mode. We are Java-wrapping this console debugger so that it can

使用zrender.js绘制体温单(2)

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今天我们来画折线图效果图以下为模拟数据 [{"time":19,"text":"入\n院\n19\n时\n11\n分","position":42,"cellMin":29.0,"cellSplit":0.2,"type":"text","color":"red","shape":null},{"time":22,"text":"手\n术","position":42,"cellMin":29.0,"cellSplit":0.2,"type":"text","color":"red","shape":null},{"time":129,"text":"手\n术","position":42,"cellMin":29.0,"cellSplit":0.2,"type":"text","color":"red","shape":null},{"cellMin":29.0,"cellSplit":0.2,"y":30.0,"type":"baseline","color":"#000","shape":null},{"cellMin":29.0,"cellSplit":0.2,"y":31.0,"type":"baseline","color":"#000","shape":null},{"cellMin":29.0,"cellSplit":0.2,"y":32.0,"type":

Perl Breaking out of an If statement

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This one just came up: How do I break out of an if statement? I have a long if statement, but there is one situation where I can break out of it early on. In a loop I can do this: while (something ) { last if $some_condition; blah, blah, blah ... } However, can I do the same with an if statement? if ( some_condition ) { blah, blah, blah last if $some_other_condition; # No need to continue... blah, blah, blah ... } I know I could put the if statement inside a block, and then I can break out of the block: { if ( some_condition ) { ... last if $some_other_condition; # No need to continue... blah,

In JavaScript, is returning out of a switch statement considered a better practice than using break?

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问题 Option 1 - switch using return: function myFunction(opt) { switch (opt) { case 1: return "One"; case 2: return "Two"; case 3: return "Three"; default: return ""; } } Option 2 - switch using break: function myFunction(opt) { var retVal = ""; switch (opt) { case 1: retVal = "One"; break; case 2: retVal = "Two"; break; case 3: retVal = "Three"; break; } return retVal; } I know that both work, but is one more of a best practice? I tend to like Option 1 - switch using return best, as it's cleaner

实用类介绍

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一.基本值类型及对应包装类　　1.基本数值类型　　　　　　2.对应包装类　　3.除了Character包装类之外，其他的包装类parseXXX的方法将String.变量转换为对应的基本类型，valueOf(String)也可以　　4.除了Character包装类之外，其他的包装类都提供了String类型的带参构造可自动将字符串转换为对应的包装类型　　5.所有的包装类都可以将对应的基本类型作为参数传递，包装为包装类类型　　6.将包装类转换为基本数据类型的操作: 包装类对象.XXXValue() 二.枚举类型　　1.枚举类型用enum来修饰　　2.枚举是不允许存在普通和普通函数:视为一组常量的集合（集合具有唯一性）　　例如：星期枚举　 public enum WeekEnum { MON,TUES,WEN,THUR,FRI,STAR,SUN } public class enumTest { public static void main(String[] args) { getWeek(WeekEnum.SUN); } public static void getWeek(WeekEnum week) { switch (week) { case MON: System.out.println("这是星期一"); break; case TUES: System

Lambda表达式mapToDouble.sum精度问题

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public static void main(String[] args) { List<Double> doubles = Arrays.asList(new Double(3.3), new Double(3.3), new Double(3.3)); double sum = doubles.stream().mapToDouble(Double::doubleValue).sum(); System.out.println(sum);// 9.899999999999999 System.out.println(formatDigit(sum,2));// 9.9 System.out.println(formatDigit_down(sum, 2)); // 9.89 List<Double> doubles1 = Arrays.asList(new Double(1.1), new Double(1.1), new Double(1.1)); double sum1 = doubles1.stream().mapToDouble(Double::doubleValue).sum(); System.out.println(sum1);// 3.3000000000000003 System.out.println(formatDigit(sum1,2));// 3.3

continue break exit(0) return 的用法和区别

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continue break exit(0) return 的用法和区别 break: 负责终止离它最近的while、do while、for或switch语句，并从这些语句之后的第一条语句开始继续执行。break语句只能出现在迭代语句或者switch语句内部（包括潜逃在此类循环里的语句或块的内部）。break语句的作用范围仅限于最近的循环或者switch。 continue: 终止最近的循环中的当前迭代并立即开始下一次迭代。continue语句只能出现在for、while、和do while循环内部，或者嵌套在此类循环里的语句或者块的内部。和break语句类似的是，出现在嵌套循环中的continue语句也仅作用于离它最近的循环。和break语句不同的是，只有当swith语句嵌套在迭代语句内部时，才能在switch里使用continue。 return: 终止当前函数的执行。 exit(0): exit 函数将无条件地关闭程序。因为它绕过了程序的正常逻辑流程，所以应该谨慎使用它。有时候会出现一些非常少见的情况，使得程序有必要在 main 以外的函数中终止。要实现这一点，可以使用 exit 函数。要使用 exit 函数，必须包含 < c s t d l i b > <cstdlib> < c s t d l i b > 头文件。请注意，该函数采用整数实参

How do I read a “,” as “<br />” in PHP/MySQL?

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问题 So I have this MySQL database and a table and in the rows there a lot of "," in them, and I wish when they are output on the screen with PHP to be switched to " " instead of coma, how do I do that? I mean, this is a example, it stands like this: hello,no,thanks and instead of being output like that I would like it to be output as: hello no thanks How do I do that? Could someone do it for me? Would be very friendly. 回答1: Assuming there are no CSV quoting issues: $newStr = str_replace( ',', '

How to break out of multiple loops at once in C#?

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What if I have nested loops, and I want to break out of all of them at once? while (true) { // ... while (shouldCont) { // ... while (shouldGo) { // ... if (timeToStop) { break; // Break out of everything? } } } } In PHP, break takes an argument for the number of loops to break out of. Can something like this be done in C#? What about something hideous, like goto ? // In the innermost loop goto BREAK // ... BREAK: break; break; break; Extract your nested loops into a function and then you can use return to get out of the loop from anywhere, rather than break. Introduce another control flag and

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