面试问题，盼答案

1) Why is this program not portable:

#include
#include

/* This function returns a value in which bit 'n' is set. Bits are
counted from right to left. The rightmost bit (the least significant
bit) is bit #0. */
long
set_bit(unsigned n)
{
assert(n
return 1 }




2) A flex input file contains this regular expression that is supposed
to match a C comment. Is it correct? If not, why not.

"/*""/"*([^*/]|[^*]"/"|"*"[^/])*"*"*"*/"





3) In Perl, what's the difference between "my" and "local"? When should
"local" be used?

所有跟帖： 

• Q #3 - the scope of variables -胡说之- ♂ (252 bytes) () 08/25/2010 postreply 14:48:27

• Q1: can run into infinite loop with a dumb compiler -catcher- ♂ (0 bytes) () 08/25/2010 postreply 17:30:04

• 好的compiler恰恰应该给出编译错误，不是吗？ -吃糖？- ♂ (49 bytes) () 08/25/2010 postreply 21:35:34

• 帖子里不能显示back slash, 你的第二题显示不完整 -胡说之- ♂ (0 bytes) () 08/25/2010 postreply 19:18:57

• 尽管如此，可以猜测一下 -胡说之- ♂ (115 bytes) () 08/25/2010 postreply 19:22:57

• 回复：面试问题，盼答案 -老憨头- ♂ (95 bytes) () 08/25/2010 postreply 20:48:56