RE: prime numbers question
- From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Sun, 16 Aug 2009 14:53:28 -0400
Hey they didn't give away the entire answer. I want to know what the 6
trillionth prime number is does anyone have that off the top of their heads?
Ken
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Sina Bahram
Sent: Sunday, August 16, 2009 2:00 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: prime numbers question
I agree, but sense others already gave away the entire answer, it's moot.
Take care,
Sina
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of black ares
Sent: Sunday, August 16, 2009 1:53 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: prime numbers question
yes but these little optimisations, offer also hints about how to think.
I talked with him before about another homework and I've said that I will
never offer him the full code because this way he will not learn any thing.
The most important is to learn to think.
Learning programming does not mean to learn a new programming language and
to know a lot of them and finally knowing to do nothing when it comes to a
problem.
As I know from past messages he knows or at least said to know vb.
If I were him I would try to write a vb program for this problem and after
to put it in c++ to see the diferences, similarities etc.
----- Original Message -----
From: "Sina Bahram" <sbahram@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Sunday, August 16, 2009 4:07 PM
Subject: RE: prime numbers question
> *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,
> and
> so on.
>
> *smile*
>
> Take care,
> Sina
>
> -----Original Message-----
> From: programmingblind-bounce@xxxxxxxxxxxxx
> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Chris
> Hofstader
> Sent: 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
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