finding max value

[JR]

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?

[[Gandalf]]

code:

if (currentNumber > currentMaxNumber) currentMaxNumber = currentNumber;

or if you include <cmath>.

code:

currentMaxNumber = max (currentNumber, currentMaxNumber);

Something along those lines. If you need more specific help, just be more specific in your next question.

[wtd]

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

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

code:

#include <iostream> #include <algorithm> using namespace std; int main() {    cout << max(3, 5) << endl;    return 0; }

[bugzpodder]

[Gandalf] wrote:

code:

if (currentNumber > currentMaxNumber) currentMaxNumber = currentNumber;

or if you include <cmath>.

code:

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

[md]

bugzpodder wrote:

[Gandalf] wrote:

code:

if (currentNumber > currentMaxNumber) currentMaxNumber = currentNumber;

or if you include <cmath>.

code:

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.

[bugzpodder]

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.

[bugzpodder]

or are you cornflake changing usernames :S

[md]

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

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.