Get yourself a copy of William Cody Jr. and William Waite's "Software Manual for the Elementary Functions" and go to page 35...
--hsm > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Jeroen > Sent: Thursday, September 16, 2004 10:15 AM > To: The Great Internet Mersenne Prime Search list > Subject: Re: [Prime] Counting Number of Digits of a^n > > A little question, little offtopic. > I need an algorithm to calculate log, I tryed to find it but no success. > The normal log function isn't good enough because it only give normal > floating point numbers, i need to have it 1M bits long (or longer). > > > *********** REPLY SEPARATOR *********** > > On 15-9-2004 at 19:27 [EMAIL PROTECTED] wrote: > > >(This is in response to the post of 15 Sept. 2004.) > > > >To count the number of digits of a number in the form a^n, try this > QBASIC > > > >program: > > > >CLS : PRINT "Program to calculate the number of digits of a^n": PRINT > >DO: a = 0: n = 0 > >WHILE a <= 0 OR a <> INT(a): INPUT "What is the (positive integer) base, > >a"; > >a: WEND > >WHILE n <= 0 OR n <> INT(n): INPUT "What is the (positive integer) > power, > >n"; n: WEND > >digits = INT(n * (LOG(a) / LOG(10))) + 1 > >PRINT : PRINT "Number of digits is"; digits > >PRINT "********************************": PRINT > >LOOP > > > >A full discussion of this appears on the REC Web site, > >_http://beam.to/REC_ > >(http://beam.to/REC) > > > >Best, Mike > >Michael W. Ecker, Ph.D. > > > >Dr. Mike Ecker, Editor-Publisher > >Recreational & Educational Computing* > >187 Ferguson Ave./ Suite D > >Shavertown, PA 18708 > > > > > >* REC has been published continuously since Jan. 1986. > >_http://members.aol.com/DrMWEcker/REC.html_ > >(http://members.aol.com/DrMWEcker/REC.html) > >or _http://beam.to/REC_ (http://beam.to/REC) > > > > > >(Dr. Michael W. Ecker is also Associate Professor of Mathematics, > >Pennsylvania State University, Wilkes-Barre Campus, Lehman, PA 18627.) > > > > _______________________________________________ > Prime mailing list > [EMAIL PROTECTED] > http://hogranch.com/mailman/listinfo/prime _______________________________________________ Prime mailing list [EMAIL PROTECTED] http://hogranch.com/mailman/listinfo/prime
