blocks|key|21869|text|这很好，continue语句与封闭循环相关，并且您的代码应该等价于(避免这样的跳转语句)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|21870|while+(something+=+get_something())+{
++++if+(something+==+A+%7C%7C+something+==+B)
++++++++do_something();
}|code-block|syntax|javascript|21871|但是，如果您希望break像您的注释所建议的那样退出循环(它总是再次尝试另一个东西，直到计算结果为false)，那么您将需要一个不同的结构。|21872|例如：|21873|do+{
++++something+=+get_something();
}+while+(!(something+==+A+%7C%7C+something+==+B));
do_something();|21874|entityMap^0|4|8|0|0|8|5|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

It's fine, the <code>continue</code> statement relates to the enclosing loop, and your code should be equivalent to (avoiding such jump statements):

<pre><code>while (something = get_something()) {
 if (something == A || something == B)
 do_something();
}
</code></pre>

But if you expect <code>break</code> to exit the loop, as your comment suggest (it always tries again with another something, until it evaluates to false), you'll need a different structure.

For example:

<pre><code>do {
 something = get_something();
} while (!(something == A || something == B));
do_something();
</code></pre>

blocks|key|21696|text|是，switch语句将忽略continue，并将转到要测试的循环的条件。我想分享一下Ritchie从C编程语言参考中摘录的内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|21697|21698|+continue语句与break相关，但使用频率较低；它导致封闭的for、while或do循环的下一次迭代开始。在while和do中，这意味着测试部分立即执行；在for中，控制传递到增量步骤。|blockquote|offset|length|style|CODE|21699|21700|continue语句仅适用于循环，不适用于switch+语句。循环内的continue+switch+内的continue会导致下一次循环迭代。|BOLD|21701|21702|对于C%2B%2B，我不确定这一点。|21703|entityMap^0|0|0|1|8|C|5|Y|3|12|5|18|2|1M|5|1S|2|2A|3|0|0|L|6|S|F|18|6|1F|L|L|6|Z|8|18|6|1H|8|0|0|0|E|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|U|8|@$F|V|G|W|H|I]|$F|X|G|Y|H|I]|$F|Z|G|10|H|I]|$F|11|G|12|H|I]|$F|13|G|14|H|I]|$F|15|G|16|H|I]|$F|17|G|18|H|I]|$F|19|G|1A|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1C|8|@$F|1D|G|1E|H|M]|$F|1F|G|1G|H|M]|$F|1H|G|1I|H|M]|$F|1J|G|1K|H|M]|$F|1L|G|1M|H|I]|$F|1N|G|1O|H|I]|$F|1P|G|1Q|H|I]|$F|1R|G|1S|H|I]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1U|8|@$F|1V|G|1W|H|M]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]]|R|$]]

Yes, continue will be ignored by the switch statement and will go to the condition of the loop to be tested.
I'd like to share this extract from The C Programming Language reference by Ritchie:
<blockquote>
The <code>continue</code> statement is related to <code>break</code>, but less often used; it causes the next iteration of the enclosing <code>for</code>, <code>while</code>, or <code>do</code> loop to begin. In the <code>while</code> and <code>do</code>, this means that the test part is executed immediately; in the <code>for</code>, control passes to the increment step.
The continue statement applies only to loops, not to a <code>switch</code> statement. A <code>continue</code> inside a <code>switch</code> inside a loop causes the next loop iteration.
</blockquote>
I'm not sure about that for C++.

blocks|key|1006569|text|是的，它很好-就像在if语句中使用它一样。当然，您不能使用break从交换机内部中断循环。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1006570|entityMap^0|A|2|T|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Yes, it's OK - it's just like using it in an <code>if</code> statement. Of course, you can't use a <code>break</code> to break out of a loop from inside a switch.

blocks|key|1006687|text|它在语法上是正确的，在风格上也是正确的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1006688|好的风格要求每条case:语句都应该以以下其中一项结尾：|offset|length|style|CODE|1006689|+break;
+continue;
+return+(x);
+exit+(x);
+throw+(x);
+//fallthrough|code-block|syntax|javascript|1006690|此外，在case+(x):之后立即使用|1006691|+case+(y):
+default:|1006692|是允许的-捆绑几个具有完全相同效果的案例。|1006693|任何其他的东西都被怀疑是错误的，就像if(a=4){...}一样，当然你需要闭合循环(while，for，do...while)才能让continue工作。它不会单独循环回case()。而是像这样的构造：|1006694|while(record+=+getNewRecord())
{
++++switch(record.type)
++++{
++++++++case+RECORD_TYPE_...;
++++++++++++...
++++++++break;
++++++++default:+//unknown+type
++++++++++++continue;+//skip+processing+this+record+altogether.
++++}
++++//...more+processing...
}|1006695|好的，...is。|1006696|entityMap^0|0|8|5|0|0|4|9|0|0|0|I|C|17|5|1D|3|1H|A|1V|8|2E|6|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|15|8|@$D|16|E|17|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|18|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1A|8|@$D|1B|E|1C|F|G]|$D|1D|E|1E|F|G]|$D|1F|E|1G|F|G]|$D|1H|E|1I|F|G]|$D|1J|E|1K|F|G]|$D|1L|E|1M|F|G]]|9|@]|A|$]]|$1|U|3|V|5|J|7|1N|8|@]|9|@]|A|$K|L]]|$1|W|3|X|5|6|7|1O|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|Z|$]]

It's syntactically correct and stylistically okay.

Good style requires every <code>case:</code> statement should end with one of the following:

<pre><code> break;
 continue;
 return (x);
 exit (x);
 throw (x);
 //fallthrough
</code></pre>

Additionally, following <code>case (x):</code> immediately with

<pre><code> case (y):
 default:
</code></pre>

is permissible - bundling several cases that have exactly the same effect.

Anything else is suspected to be a mistake, just like <code>if(a=4){...}</code>
Of course you need enclosing loop (<code>while</code>, <code>for</code>, <code>do...while</code>) for <code>continue</code> to work. It won't loop back to <code>case()</code> alone. But a construct like:

<pre><code>while(record = getNewRecord())
{
 switch(record.type)
 {
 case RECORD_TYPE_...;
 ...
 break;
 default: //unknown type
 continue; //skip processing this record altogether.
 }
 //...more processing...
}
</code></pre>

...is okay.

blocks|key|1006626|text|虽然在技术上是有效的，但所有这些跳转都模糊了控制流--尤其是continue语句。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1006627|我会使用这样的技巧作为最后的手段，而不是第一个。|1006628|怎么样|1006629|while+(something+=+get_something())
{
++++switch+(something)
++++{
++++case+A:
++++case+B:
++++++++do_something();
++++}++++++++
}|code-block|syntax|javascript|1006630|它更短，并以更清晰的方式执行其内容。|1006631|entityMap^0|U|8|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|X|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|Y|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

While technically valid, all these jumps obscure control flow -- especially the <code>continue</code> statement.

I would use such a trick as a last resort, not first one.

How about

<pre><code>while (something = get_something())
{
 switch (something)
 {
 case A:
 case B:
 do_something();
 } 
}
</code></pre>

It's shorter and perform its stuff in a more clear way.

blocks|key|2416165|text|这可能是一个兆位的延迟，但您可以使用continue+2。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2416166|一些php+build/+configs会输出这个警告：|2416167|2416168|+PHP警告："continue“目标开关等同于"break”。你的意思是用“继续2”吗？|blockquote|2416169|2416170|2416171|例如：|2416172|$i+=+1;

while+($i+<=+10)+{
++++$mod+=+$i+%25+4;
++++echo+"\r\n+out+$i";
++++$i%2B%2B;
++++switch($mod)
++++{
++++++++case+0:
++++++++++++break;
++++++++case+2:
++++++++++++continue;
++++++++++++break;
++++++++default:
++++++++++++continue+2;
++++++++++++break;
++++}
++++echo+"+is+even";
}|code-block|syntax|javascript|2416173|这将输出：|2416174|out+1
out+2+is+even
out+3
out+4+is+even
out+5
out+6+is+even
out+7
out+8+is+even
out+9
out+10+is+even|2416175|使用PHP5.5及更高版本进行测试。|2416176|entityMap^0|I|A|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|17|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|18|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|19|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1A|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1B|8|@]|D|@]|E|$S|T]]|$1|U|3|V|5|6|7|1C|8|@]|D|@]|E|$]]|$1|W|3|X|5|R|7|1D|8|@]|D|@]|E|$S|T]]|$1|Y|3|Z|5|6|7|1E|8|@]|D|@]|E|$]]|$1|10|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|11|$]]

This might be a megabit to late but you can use <code>continue 2</code>.

Some php builds / configs will output this warning:

<blockquote>
 PHP Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"?
</blockquote>

For example:

<pre><code>$i = 1;

while ($i &lt;= 10) {
 $mod = $i % 4;
 echo "\r\n out $i";
 $i++;
 switch($mod)
 {
 case 0:
 break;
 case 2:
 continue;
 break;
 default:
 continue 2;
 break;
 }
 echo " is even";
}
</code></pre>

This will output:

<pre><code>out 1
out 2 is even
out 3
out 4 is even
out 5
out 6 is even
out 7
out 8 is even
out 9
out 10 is even
</code></pre>

Tested with PHP 5.5 and higher.

I want to jump from the middle of a <code>switch</code> statement, to the loop statement in the following code:

<pre><code>while (something = get_something())
{
 switch (something)
 {
 case A:
 case B:
 break;
 default:
 // get another something and try again
 continue;
 }
 // do something for a handled something
 do_something();
}
</code></pre>

Is this a valid way to use <code>continue</code>? Are <code>continue</code> statements ignored by <code>switch</code> statements? Do C and C++ differ on their behaviour here?

Using continue in a switch statement

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想从switch语句的中间跳到以下代码中的循环语句：while (something = get_something()){    switch (something)    {    case A:    case B:        break;    default:        // get another something and try again        continue

问在switch语句中使用continue
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回答 6

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问在switch语句中使用continue
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