AlliedModders - Float number calculations

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- - Float number calculations (https://forums.alliedmods.net/showthread.php?t=221155)

dFF	07-18-2013 15:39

Float number calculations

For example i have:

PHP Code:


		
			
static Float:fStart, Float:fAdd
    
fStart = getDayValue( 1 )
fAdd = fStart + 0.1

client_print( id, print_chat, "fStart: %f", fStart )
client_print( id, print_chat, "fAdd: %f", fAdd )

Float:get_DayValue( day )
{
    if( day == 1 )
        return 80.0
    
    return 1.0

}

debug say:

Code:

fStart: 80.000000

fAdd: 80.099998

why not increased with 8.1 ? I want everytime 80.0 increased like: 80.1, 80.2, 80.3, 80.4 ..

ConnorMcLeod

07-18-2013 15:43

Re: Float number calculations

Dunno if it is the way it is printed, or if it is due to float precision, anyway, internal value should be ok.

dFF	07-18-2013 15:45

Re: Float number calculations

Yeah .. the printed is same, floats are strange in amxx, and i need to use floats.

zeus	07-18-2013 16:10

Re: Float number calculations

I have made a similar test

Code:

new Float:a = 32.0;

new Float:b = 0.13;

new Float:s;

        

s = a + b;

client_print(id,print_chat,"%f",s);

The result shown is

Code:

32.130001

Tested with latest HLDS build, AMXX Build ID: 1.8.3-dev 140:f57bd4cee0b7, runing CentOS 6 64bit.

ConnorMcLeod

07-18-2013 20:39

Re: Float number calculations

This is how float works in pawn or in c++, so what i said that should be ok internally seems wrong.

You can read those interesting thread :
https://forums.alliedmods.net/showthread.php?t=53543
https://forums.alliedmods.net/showthread.php?t=53535
https://forums.alliedmods.net/showthread.php?t=47051

Anyway, in your case, multiply all by 10 and you can works with integers.

And if you want to print as Float, you can trick it like this :

PHP Code:


		
			
    static iNumber = 800; // instead of 80.0

    new szNumber[32];
    new len = formatex(szNumber, cm(szNumber), "%d", ++iNumber); // add 1 instead of 0.1
    szNumber[len] = szNumber[len-1];
    szNumber[len-1] = '.';
    client_print(id, print_chat, szNumber);

.Dare Devil.

07-18-2013 21:52

Re: Float number calculations

somehow, sometimes the floats act this way...
Nothing wrong with you code and there is nothing ( i think ) you can do.
Also they work in c++ same way.

dFF	07-19-2013 13:54

Re: Float number calculations

Thank you again Connor :wink:.

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