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OT: C++ Recursion [message #192146]

Tue, 07 March 2006 20:25

icedog90
Messages: 3483
Registered: April 2003

Karma: 0

General (3 Stars)

http://img328.imageshack.us/img328/2981/die3qy.png

Anyone who knows at least the basics of C++, can you help me try to understand this damn awful question? My head hurts like hell by going over and over again trying to figure out why the answer is number 3. First, I was beginning to understand why it was 3, and now (after going over it so many times) my head is so fried I don't even remember how it works. I'm done trying to figure this out, my head hurts a lot and it's just pissing me off.

Remember, the answer is 3 (letter C) but I want to know why.

(This is a review I brought home to get ready for a test)

Thanks.

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Re: OT: C++ Recursion [message #192148 is a reply to message #192146]

Tue, 07 March 2006 20:42

Dave Anderson
Messages: 1953
Registered: December 2004
Location: United States

Karma: 0

General (1 Star)

I don't have any of my C++ programming books anymore, and I forgot what the % operator stands for. If you can tell me that, I may be able to figure it out.

EDIT: Nevermind, I remember now. the % operator is a modulus. Example: int rem = 4 % 3;

Of course you probobly already know that...lol. I will further try to figure this out.

What are your thoughts on this so far?

David Anderson
Founder, Software Consultant
DCOM Productions
Microsoft Partner (MSP)

[Updated on: Tue, 07 March 2006 20:52]

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Re: OT: C++ Recursion [message #192153 is a reply to message #192146]

Tue, 07 March 2006 21:28

Oblivion165
Messages: 3468
Registered: June 2003
Location: Hendersonville, North Car...

Karma: 0

General (3 Stars)

Ah ok, a number divided by itself = 1.

If that doesnt get you there, nothing will.

WOL: Ob165ion Skype: Oblivion165 Yahoo Instant Messenger: CaptainJohn165

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Re: OT: C++ Recursion [message #192154 is a reply to message #192146]

Tue, 07 March 2006 21:33

CPUKiller
Messages: 17
Registered: June 2005

Karma: 0

Recruit

Looking Recursively:

1 + ValueOf(5) (11%2-> 1, 11/2 -> 5)
	  1 + ValueOf(2) (5%2-> 1, 5/2 -> 2)
	      0 + ValueOf(1) (2%2-> 0, 2/2 -> 1)
	         1 + ValueOf(0) (1%2-> 1, 1/2 -> 0)

http://www.viralsound.com/get/cpukiller.php

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Re: OT: C++ Recursion [message #192156 is a reply to message #192146]

Tue, 07 March 2006 21:56

Ryan3k
Messages: 363
Registered: September 2004
Location: USA

Karma: 0

Commander

CPUKiller has pretty much got it, I don't know C++ myself, but I know Java, and all you need to know is that the '%' operator is for modular division, and it gives you the remainder of a/b.

For example,
10 % 3 = 1
10 % 10 = 0
12 % 5 = 2

Another important note is that because it is an int, it will truncate decimals. In the first runthrough of ValueOf, when you divide 11 by 2, you get 5.5, right? Well, it won't round it up to 6. It truncates the decimal, and you end up with 5.

5 becomes the new 'N', passed as parameter to ValueOf... etc. etc.

A Path Beyond

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Re: OT: C++ Recursion [message #192158 is a reply to message #192154]

Tue, 07 March 2006 22:03

icedog90
Messages: 3483
Registered: April 2003

Karma: 0

General (3 Stars)

CPUKiller wrote on Tue, 07 March 2006 20:33

Looking Recursively:

1 + ValueOf(5) (11%2-> 1, 11/2 -> 5)
	  1 + ValueOf(2) (5%2-> 1, 5/2 -> 2)
	      0 + ValueOf(1) (2%2-> 0, 2/2 -> 1)
	         1 + ValueOf(0) (1%2-> 1, 1/2 -> 0)

Thanks a ton... I fully understand it now. That got rid of the lock in my brain.

Thanks everyone else. Rocked Over

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Re: OT: C++ Recursion [message #192159 is a reply to message #192158]

Tue, 07 March 2006 22:10

Ryan3k
Messages: 363
Registered: September 2004
Location: USA

Karma: 0

Commander

Sometimes you just have to put it down and look at it later. When I took my Calculus II final last semester, I was so nervous and had been studying so much that I literally forgot Calculus for the first 10 minutes of the exam. I just let go for a little while, tried to calm down, then everything came back to me.

I forgot all of my +C's, but I still ended up with an A on it. Big Grin

A Path Beyond

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Re: OT: C++ Recursion [message #192161 is a reply to message #192146]

Tue, 07 March 2006 22:23

icedog90
Messages: 3483
Registered: April 2003

Karma: 0

General (3 Stars)

Yeah, that's pretty much what went on with me. Thanks for the advice. Waiting on it did help a lot.

...and nice job on the grade, hehe.

[Updated on: Tue, 07 March 2006 22:24]

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Re: OT: C++ Recursion [message #192162 is a reply to message #192146]

Tue, 07 March 2006 23:20

Dave Anderson
Messages: 1953
Registered: December 2004
Location: United States

Karma: 0

General (1 Star)

Well, seems that I have learned a thing or two from this topic:

Quote:

For example,
10 % 3 = 1
10 % 10 = 0
12 % 5 = 2

I thank you very much for refreshing my memory. Very Happy

EDIT: Since this is the same subject, I just wanted to let y'all know that when I finish my website, (which is taking forever because it gets boring at times), I will have a complete section on C++ where you can go if you want to learn the basics of C++. It will be pretty explanatory and should be pretty straight foward. When I first learned C++, I pretty much went to my local library, checked out a C++ book, and was writing very basic programs within the hour I started reading.

My object for providing this section on my site, is I am hoping that others interested in C++ can use what I have learned to learn it themselves.

David Anderson
Founder, Software Consultant
DCOM Productions
Microsoft Partner (MSP)

[Updated on: Tue, 07 March 2006 23:25]

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Re: OT: C++ Recursion [message #192163 is a reply to message #192146]

Tue, 07 March 2006 23:22

icedog90
Messages: 3483
Registered: April 2003

Karma: 0

General (3 Stars)

Modulus is a bitch... because it's easy to forget.

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Re: OT: C++ Recursion [message #192217 is a reply to message #192146]

Wed, 08 March 2006 15:32

Sir Kane
Messages: 1701
Registered: March 2003
Location: Angerville

Karma: 0

General (1 Star)

Wonder what happens if you __forceinline that function lol

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Re: OT: C++ Recursion [message #192228 is a reply to message #192217]

Wed, 08 March 2006 19:03

=HT=T-Bird
Messages: 712
Registered: June 2005

Karma: 0

Colonel

Silent Kane wrote on Wed, 08 March 2006 16:32

Wonder what happens if you __forceinline that function lol

If the argument was a constant-expression, I'd say that most sensible compilers capable of unit-at-a-time compilation would be able to evaluate the entire mess at compile time (it's a pure function).

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