perl中如何获得随机整数？

rand(n)得到的是不大于n的浮点数，但是我要的是整数，有什么办法呢？

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rand   EXPR  
   
  rand  
   
  Returns   a   random   fractional   number   greater   than   or   equal   to   0   and   less   than   the   value   of   EXPR.   (EXPR   should   be   positive.)   If   EXPR   is   omitted,   the   value   1   is   used.   Currently   EXPR   with   the   value   0   is   also   special-cased   as   1   -   this   has   not   been   documented   before   perl   5.8.0   and   is   subject   to   change   in   future   versions   of   perl.   Automatically   calls   srand   unless   srand   has   already   been   called.   See   also   srand.    
  Apply   int()   to   the   value   returned   by   rand()   if   you   want   random   integers   instead   of   random   fractional   numbers.   For   example,  
   
          int(rand(10))returns   a   random   integer   between   0   and   9,   inclusive.  
   
  (Note:   If   your   rand   function   consistently   returns   numbers   that   are   too   large   or   too   small,   then   your   version   of   Perl   was   probably   compiled   with   the   wrong   number   of   RANDBITS.)  
 

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