Re: prime numbers question

  • From: "black ares" <matematicianu2003@xxxxxxxxxxx>
  • To: <programmingblind@xxxxxxxxxxxxx>
  • Date: Sun, 16 Aug 2009 20:52:40 +0300

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.
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