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
在PHP中，字符串和函数指针一样好:
$x = "foo";
function foo(){ echo "wtf"; }
$x(); # "wtf"
不幸的是，这并不管用:
"foo"();
其他回答
javascript:
parseInt('06'); // 6
parseInt('08'); // 0
我一直在想为什么最简单的程序是:
class HelloWorldApp {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
然而它可以是:
print "Hello World!"
也许这是为了吓唬计算机科学专业的学生……
Perl的许多内置变量:
$# — not a comment! $0, $$, and $? — just like the shell variables by the same name $ˋ, $&, and $' — weird matching variables $" and $, — weird variables for list- and output-field-separators $! — like errno as a number but strerror(errno) as a string $_ — the stealth variable, always used and never seen $#_ — index number of the last subroutine argument... maybe @_ — the (non)names of the current function... maybe $@ — the last-raised exception %:: — the symbol table $:, $^, $~, $-, and $= — something to do with output formats $. and $% — input line number, output page number $/ and $\ — input and output record separators $| — output buffering controller $[ — change your array base from 0-based to 1-based to 42-based: WHEEE! $} — nothing at all, oddly enough! $<, $>, $(, $) — real and effective UIDs and GIDs @ISA — names of current package’s direct superclasses $^T — script start-up time in epoch seconds $^O — current operating system name $^V — what version of Perl this is
还有很多这样的东西。点击这里阅读完整列表。
这里有一大堆奇怪的C特性:http://www.steike.com/code/useless/evil-c/
雅达利基本:
你可以在不写循环的情况下用字符填充字符串:
10 DIM A$(100)
20 A$(1)=" ":A$(100)=" ":A$(2)=A$
