在你看来,你遇到过的最令人惊讶、最怪异、最奇怪或最“WTF”的语言特性是什么?

请每个回答只回答一个特征。


当前回答

这并不奇怪或令人惊讶,但这让我总是说WTF:

语法或标识符名称的大小写敏感性。

大多数具有它的语言似乎只是因为C具有它。这样做没有什么好的理由。

其他回答

我在试图找出一个完全没有意义但无论如何都能工作的MACRO时遇到了这个。这对于objective-c是正确的,但对于其他类型的C(或者至少是gcc编译器)也可能是正确的。

NSString *oneString = @"This " @"is " @"just " @"one " @"normal " @" string";

=

NSString *oneString = @"This is just one normal string";

C风格的字符串也是如此

char* str = "this " "also " "works";

Duff的C语言设备!

在C语言中,可以将do/while语句与switch语句交错使用。下面是memcpy使用此方法的示例:

void duff_memcpy( char* to, char* from, size_t count ) {
    size_t n = (count+7)/8;
    switch( count%8 ) {
    case 0: do{ *to++ = *from++;
    case 7:     *to++ = *from++;
    case 6:     *to++ = *from++;
    case 5:     *to++ = *from++;
    case 4:     *to++ = *from++;
    case 3:     *to++ = *from++;
    case 2:     *to++ = *from++;
    case 1:     *to++ = *from++;
            }while(--n>0);
    }
}

在JavaScript中:

 '5' + 3 gives '53'

 '5' - 3 gives 2

我最喜欢的奇怪的C语言是5[“Hello World”],但因为已经发布了,我最喜欢的第二个奇怪的是Windows版本结构初始化黑客:

void someWindowsFunction() {
    BITMAPINFOHEADER header = {sizeof header};

    /* do stuff with header */
}

这条微妙的线条达到了以下效果:

Declares a BITMAPINFOHEADER structure Concisely sets the "size" member of the structure, without hardcoding a size constant (since many Window structures, including BITMAPINFOHEADER, follow the convention of specifying the size of the structure as the first member} Declares the version of the structure (since many Windows structures, including BITMAPINFOHEADER, identify their version by the declared size, following the convention that structures definitions are append-only) Clears all other members of the structure (a C standard behavior when a structure is incompletely initialized).

Common Lisp的format函数有一个选项,可以将数字打印为罗马数字。

在INTERCAL中,这是你能得到的唯一输出形式。