What is the best BASIC Pocket Computer
04-18-2014, 09:12 PM
Post: #86
 Guenter Schink Senior Member Posts: 354 Joined: Dec 2013
RE: What is the best BASIC Pocket Computer
(04-16-2014 08:23 PM)Guenter Schink Wrote:  Your example of 167699497 is calculated in about 2.4 seconds

Günter

Now I have transformed the code into a structured form, no "GOTOs" any more . Then I use some special operations of UBASIC. But the algorithm is the same still.
Code:
 100   input "X=";X   110   clr time   120   M=int(sqrt(X))   130   F=0   140   data 2,1,2,2   145    ' take care of divisors 2-7   150   for I=1 to 4   160   read S:gosub *Divide   170   next I   180   data 4,2,4,2,4,6,2,6   185    'Now calculate with numbers >7 omitting all that can be divided by 2,3 and 5   190   while X>1   200    for I=1 to 8   210    read S   220    gosub *Divide   230    next I   240    restore 180   250    if F>M then   260    :    F=X   270    :    S=0   280    :    gosub *Divide   290    endif   300   wend   310   ET=time1000/1000     'time1000 gives milliseconds after last "clr time"   320   print:print "Execution Time: "   330   print ET;   340   end   345   'Now start factoring   350   *Divide   360   F+=S                'this is shorter and faster for F=F+S   370   while not X@F        'while there is no remainder   380       X\=F            'this is short for x=x\f where "\" denotes integer division   390        M=int(sqrt(X))   400        print F;   410   wend   420   return

This program needs 1.53 sec for 167699497 on the 200LX.

Günter
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