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JR

Tue Oct 17, 2006 7:57 pm


finding max value

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Hi in a part of my program i have a loop that does some basic math to calculate a number, now the loops stops when the number reachers zero, but the number starts increasing first then after it reaches a max number it will then start decreasing, its a basic math multiplication. I was wondering how i could get that maximum value and store it in a variable, what check do i need to use?


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[Gandalf]

Tue Oct 17, 2006 9:40 pm



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if (currentNumber > currentMaxNumber) currentMaxNumber = currentNumber;
or if you include .
currentMaxNumber = max (currentNumber, currentMaxNumber);
Something along those lines.  If you need more specific help, just be more specific in your next question. ;)


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wtd

Wed Oct 18, 2006 12:28 am



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It would be better to use something more C++-y.  :)

http://www.sgi.com/tech/stl/max.html

#include 
#include 

using namespace std;

int main()
{
   cout  currentMaxNumber) currentMaxNumber = currentNumber;
or if you include .
currentMaxNumber = max (currentNumber, currentMaxNumber);
Something along those lines.  If you need more specific help, just be more specific in your next question. ;)

the second way is 1.5 times as slow as the first

You're sure? How did you measure it? 'Cause I'm pretty sure a function like max() is defined as inline; so there shouldn't be any speed difference.


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bugzpodder

Sat Oct 21, 2006 8:20 pm



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you are from waterloo?

if (currentNumber > currentMaxNumber) currentMaxNumber = currentNumber;

this does assignment only if the condition is satisfied.  

the second way does assignment regardless.  so the first approach is up to twice as faster than the second approach.


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bugzpodder

Sat Oct 21, 2006 8:21 pm



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or are you cornflake changing usernames :S


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md

Sat Oct 21, 2006 8:32 pm



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Yes, I was cornflake; my nick got changed for me :P

And yes, your right; I see how it would definitely be a small bit slower. If max is a function that must be called then it'd be a lot slower however.