C# 如何在while循环中使用continue语句？
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How to use the statement continue in while loop?
提问by Code Enthusiastic
Lets take the below code snippet:
让我们看下面的代码片段：
int i = 0;
while ( i <= 10 )
{
System.out.println(i);
if ( i == 8 )
{
continue;
}
i++;
}
What changes do I have to make in the code to avoid infinite loop?
我必须在代码中进行哪些更改才能避免无限循环？
采纳答案by Eric Petroelje
Do your increment at the beginning instead of at the end:
在开始而不是在结束时进行增量：
int i = -1;
while ( i <= 10 )
{
i++;
System.out.println(i);
if ( i == 8 )
{
continue;
}
// Presumably there would be some code here, or this doesn't really make much sense
}
Or, depending on the language, you could do it right in the whilestatement (keeping in mind operator precedence in whether you choose i++or ++i)
或者，根据语言，您可以在while语句中正确执行（请记住，无论您选择i++还是 ，运算符优先级++i）
int i = 0
while ( i++ <= 10 )
{
System.out.println(i);
if ( i == 8 )
{
continue;
}
// Presumably there would be some code here, or this doesn't really make much sense
}
I would question the use of a whileloop for this kind of structure though. If you want to use a counter in a loop, a forloop is typically more appropriate.
不过，我会质疑while对这种结构使用循环。如果您想在循环中使用计数器，for循环通常更合适。
回答by Aniket Inge
instead of a quickfix solution, lets see your code for a minute and step through it line by line:
而不是快速修复解决方案，让我们看看你的代码一分钟，然后一行一行地逐步完成：
int i = 0;
while ( i <= 10 )
{
System.out.println(i);
if ( i == 8 )
{
continue;
}
i++;
}
iat first is 0, its less than 10 and hence it enters the loop, prints 0 and increments to 1. Then ibecomes 2, 3, 4, .. 8
i起初是 0，它小于 10，因此它进入循环，打印 0 并增加到 1。然后i变成 2, 3, 4, .. 8
When it becomes equal to 8, instead of incrementing, it pops back to the beginning of the loop, printing 8 again.. checks for the value of i(which is 8) and continues again, printing 8.. and it will keep doing this until eternity.
当它变得等于 8 时，它不是递增，而是弹回到循环的开头，再次打印 8.. 检查的值i（即 8）并再次继续，打印 8.. 它将继续这样做直到永恒。
Hence, increment the number before testing and it will work as expected.
因此，在测试之前增加数字，它将按预期工作。
Change your code to something like this
把你的代码改成这样
int i = 0;
while ( i <= 10 )
{
if ( i != 8 )
{
System.out.println(i);
}
i++;
}
回答by AlvinfromDiaspar
I like Eric Petroelje's answer. I suggest doing something like this:
我喜欢 Eric Petroelje 的回答。我建议做这样的事情：
if (++i >= 8) continue;
In addition, these days compilers are good enough to warn you about this as a possible infinite loop. There are also code analysis tools that will also detect this for you.
此外，现在编译器足以警告您这是一个可能的无限循环。还有一些代码分析工具也可以为您检测到这一点。
回答by Erik
While this is not code I would ever recommend usingin most cases, it does serve the purpose:
虽然这不是我在大多数情况下推荐使用的代码，但它确实达到了以下目的：
int i = 0;
while ( i <= 10 )
{
Console.WriteLine(i.ToString());
if ( i == 8 )
{
// Do some work here, then bail on this iteration.
goto Continue;
}
Continue: // Yes, C# does support labels, using sparingly!
i++;
}
