Can you find out if 'something' is a factor of 'something else' and how?

Math and Physics Programming

Started by TheCyberFlash November 21, 2018 12:42 PM

8 comments, last by TheCyberFlash 5 years, 5 months ago

TheCyberFlash

110

Author

November 21, 2018 12:42 PM

Howdy,

I find it unlikely my title explained it properly... I want to know if I can use Wave = 0, this increments each wave... And if I could perhaps use a Switch Statement of (Wave) and have the cases check the value and find out if something is a factor.... I don't even know how to explain it -.-

Case 1, wave (find out if its a factor of 10)

do something

Case 2, wave (find out if its a factor of 5)

do something

Case 3, wave (find out if its a factor of 2)

do something

Kinda like that.. I am thinking maybe its not 'factor' maybe its 'multiple' ? I am thinking of using a Switch so on Wave 2 something happens, Wave 4 something happens again, Wave 5 something else happens, Wave 6 and 8 something happens, Wave 10 all three of them happen....

That sort of thing.. I am just stuck with the ability to check the factor/multiple stuff?? Does this help explain? Sorry, I'm terrible at this explaining thing.

Check out my game '3NDL3ZZ: Base Defense' A simple militant styled, tower defense game.

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JoeJ

4,183

November 21, 2018 01:23 PM

38 minutes ago, CyberFlash said:

I'm terrible at this explaining thing.

Yeah

Not sure, but you can take the integer division remainder and check for zero

if (x % 7 == 0) // do it if x is a multiple of 7

TheCyberFlash

110

Author

November 21, 2018 01:36 PM

12 minutes ago, JoeJ said:

x % 7 == 0

I think that is exactly what I need to know! Thank you

Check out my game '3NDL3ZZ: Base Defense' A simple militant styled, tower defense game.

GameDev.Net Project Page

JB3DG

452

November 21, 2018 02:06 PM

If you are using floating point (float or double) values however, you won't be able to use %. You would have to use fmod instead.

JB3DG

452

November 21, 2018 02:20 PM

Update: I assumed C++ was in use here (bad assumption). C# allows the use of the % operator and doesn't have the fmod function. I don't know about other languages.

TheCyberFlash

110

Author

November 21, 2018 02:23 PM

Nice one for the info Naruto! I forgot to specify what I am using ? I'm using Game Maker Studio, not sure on their language it just Lists GML so Game Maker Language I'm guna look on their docs for % - I don't think for my current situation I'll need to worry about fmod but its good to know it exists and stuff so will check that too! ty again

Check out my game '3NDL3ZZ: Base Defense' A simple militant styled, tower defense game.

GameDev.Net Project Page

JB3DG

452

November 21, 2018 05:54 PM

If you don't see a % anywhere, look for the term "mod" or "modulo", as that is what it is called. Sidenote, if you have never seen it before, the default windows calculator has a key called "Mod" in the Scientific and Programmer modes which performs the modulo function.

Update: Just searched for it myself. They have both % and mod.

https://docs2.yoyogames.com/source/_build/3_scripting/3_gml_overview/12_expressions.html

JB3DG

452

November 21, 2018 06:13 PM

Further update (sorry for the reply spamming. Studying up a bit more on the subject):

The link above also indicates that mod and % can only be used with integer values, just like C++.

However, you can create your own fmod function for floating point values. It will look like this: (note, GML does have the floor function).


//Name this script fmod
{
	var result = argument0 - (floor(argument0 / argument1) * argument1);
    return result;
}

//Examples

var test = fmod(5.3, 2);
test will be 1.3 since 2 goes into 5 twice with 1.3 remaining.

TheCyberFlash

110

Author

November 21, 2018 07:12 PM

1 hour ago, Naruto-kun said:

Update: Just searched for it myself. They have both % and mod.

Division and Modulo (div, %, mod)
div, mod (%) - Division and modulo, where div gives you the amount a value can be divided into producing only an integer quotient, while mod gives you only the remainder of a division. Note that you can only div or mod using integer values. Examples of use:

secs = time mod 60;
time_str = string(time div 60);

I found it! Nice And thanks for the fmod function too

Check out my game '3NDL3ZZ: Base Defense' A simple militant styled, tower defense game.

GameDev.Net Project Page

Can you find out if 'something' is a factor of 'something else' and how?

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