再给JavaScript投一票:

parseInt('08') == 0

因为任何前导为0的数都被解释为八进制(奇怪)，无效的八进制数被计算为0(坏)。我是在8月份发现这一点的，当时我几个月没碰过的代码自己崩溃了。事实证明，它本可以在10月份自行修复。

八进制支持显然已被弃用，所以未来几代的javascript将不会有这个仪式。

我喜欢在C中插入八进制值:

int values[8] = { 123, 154, 103, 310, 046, 806, 002, 970 };

在fortran中(当然是77，可能在95中也是如此)，未声明的变量和以I到N开头的参数(“In”组)将是INTEGER，所有其他未声明的变量和参数将是REAL(源)。这与“在某些情况下可选的空白”相结合，导致了最著名的错误之一。

正如弗雷德·韦伯在1990年的《另类民间传说:计算机》一书中所说:

I worked at Nasa during the summer of 1963. The group I was working in was doing preliminary work on the Mission Control Center computer systems and programs. My office mate had the job of testing out an orbit computation program which had been used during the Mercury flights. Running some test data with known answers through it, he was getting answers that were close, but not accurate enough. So, he started looking for numerical problems in the algorithm, checking to make sure his tests data was really correct, etc. After a couple of weeks with no results, he came across a DO statement, in the form: DO 10 I=1.10 This statement was interpreted by the compiler (correctly) as: DO10I = 1.10 The programmer had clearly intended: DO 10 I = 1, 10 After changing the . to a , the program results were correct to the desired accuracy. Apparently, the program's answers had been "good enough" for the sub-orbital Mercury flights, so no one suspected a bug until they tried to get greater accuracy, in anticipation of later orbital and moon flights. As far as I know, this particular bug was never blamed for any actual failure of a space flight, but the other details here seem close enough that I'm sure this incident is the source of the DO story.

我认为这是一个很大的WTF，如果DO10I被作为DO10I，并且反过来，因为隐式声明被认为是类型REAL。这是个很棒的故事。

C和c++中的三联体。

int main() {
   printf("LOL??!");
}

这将打印LOL|，因为trigraph ??!转换为|。

我所知道的最大的体面和奇怪的编程语言集合(今天是1313)，你可以在这里找到: http://99-bottles-of-beer.net/ 准备好看到真正奇怪的东西;-) 每个人都应该做出自己的选择

在JavaScript中，void不是关键字，不是类型声明，也不是变量名，也不是函数，也不是对象。Void是一个前缀操作符，类似于-、——、++和!你可以给任何表达式加上前缀，这个表达式的值将是undefined。

它经常被用在bookmarklet和内联事件处理程序中，比如下面这个比较常见的例子:

<a href="javascript:void(0)">do nothing</a>

在这个例子中使用它的方式使它看起来像一个函数调用，而实际上它只是一种获得原始未定义值的过于聪明的方法。大多数人并没有真正理解JavaScript中void的真正本质，这可能会导致许多讨厌的bug和奇怪的意想不到的事情发生。

不幸的是，我认为void操作符是在JavaScript中获得未定义值的唯一真正保证的方法，因为未定义，正如在另一个回答中指出的，是一个可以重新赋值的变量名，而{}。a可以被Object.prototype.a = 'foo'打乱

更新:我想到了另一种生成undefined的方法:

(function(){}())

嗯，有点啰嗦，返回“undefined”是它的目的就更不清楚了。