[MacRuby-devel] [MacRuby] #761: Integer 2 multiplication by self seems wrong

[MacRuby]

#761: Integer 2  multiplication by self seems wrong
----------------------------------+-----------------------------------------
 Reporter:  ustc.lihui@…          |       Owner:  lsansonetti@…        
     Type:  defect                |      Status:  new                  
 Priority:  blocker               |   Milestone:  MacRuby 0.6          
Component:  MacRuby               |    Keywords:  multiply 2           
----------------------------------+-----------------------------------------
 code as follows：
 {{{
 def f(a,i)

   if i<3
     return 2
   else
     v1=f(a,i-1)
     v2=f(a,i-2)
     v=v1*v2+a
     if v==0
       printf "v1=%d,v2=%d,v=%d i=%d\n" ,v1,v2,v,i
     end
     return v
   end
  return 1
 end
 s=Time.now
 n=11
 v=f(0,n)
 t=Time.now-s

 printf "f(%d,%d)=%d，comsume time%10.5f seconds\n" ,0,n,v,t

 s=Time.now
 n=11
 v=f(1,n)
 t=Time.now-s

 printf "f(%d,%d)=%d，comsume time%10.5f seconds\n" ,1,n,v,t
 }}}

 running it on ruby 1.8 & macruby 0.6，display：

 {{{
 $ macruby f.rb
 v1=36028797018963968,v2=17179869184,v=0 i=11
 f(0,11)=0，comsume time  0.014954 seconds
 f(1,11)=11568694537326272321321120595206，comsume time  0.000035 seconds
 $ ruby f.rb
 f(0,11)=618970019642690137449562112，comsume time   0.00022 seconds
 f(1,11)=11568694537326272321321120595206，comsume time   0.00019 seconds

 }}}

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/761>
MacRuby <http://macruby.org/>