I'm aware of better optimizations but figured I'd toss out the most obvious so as to possibly tease the better solutions out of the group...
this is one of those problems that even we old buggers who went to college in the seventies would try to optimize.
cdh On Aug 16, 2009, at 9:07 AM, Sina Bahram wrote:
*smile*, this is actually a very minimal optimization ... There is a far better, and just as easy, optimization, but I was trying to specifically not say it until we receive some responses, per hapse some attempts at code, andso on. *smile* Take care, Sina -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Chris HofstaderSent: Sunday, August 16, 2009 8:55 AM To: programmingblind@xxxxxxxxxxxxx Subject: Re: prime numbers question One optimization to Sina's description is that you can automatically eliminate all even numbers as all are divisible by 2. On Aug 16, 2009, at 8:46 AM, Sina Bahram wrote:Start by defining what a prime number is ... I'm going to assume you know some of this, but I won't give the full answer here. Very rough, non-mathematical definition: A prime number is any number greater than 1, which is evenly divisible by only itself and 1. The first few are: 2, 3, 5, 7, 11, 13, 17, 19, 23, and so on. So if I was a computer, and I'm given a number, I have to figure out if it is evenly divisible by only itself and one. How would I go about finding out what a number is evenly divisible by? Hint: Evenly divisible is another way of saying that when you divide a number by a divisor, the remainder is 0. If this was in print, I would have underlined the word remainder. Hope this puts you on the right track? Take care, Sina -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Marvin Hunkin Sent: Sunday, August 16, 2009 8:14 AM To: programmingblind@xxxxxxxxxxxxx Subject: prime numbers question hi. have to do a assignment in cz++. where you enter a number. then it will spit out if it is a prime number or a composite number. any ideas how i code this. cheers Marvin. E-Mail: startrekcafe@xxxxxxxxx Msn: startrekcafe@xxxxxxx Skype: startrekcafe to subscribe to the Jaws Australia group send a blank message to JawsOz-subscribe@xxxxxxxxxxxxxxx Visit my Jaws Australia Group at http://groups.yahoo.com/groups/ JawsOz/ __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind
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