Little problem with numbers - GameCreators Forum

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zxretrosoft

AGK Developer

9

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Joined: 10th Dec 2014

Location: Prague, Czech Republic

Posted: 29th May 2021 12:39

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Hello AppGameKit friends,

please how is this possible?
Can you explain it to me?

Code:

Output:

I am sorry for poor English

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Loktofeit

AGK Developer

15

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Joined: 21st Jan 2009

Location: Sarasota, FL

Posted: 29th May 2021 13:13 Edited at: 29th May 2021 13:14

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I tried to figure out what was going on but I got the same weird results. Tested in AGK2 and AGKS. It's almost as if it doesn't work with it as a single number and breaks it into parts to manage it.

Here's the code I used and a screenshot of my results.

+ Code Snippet

 
  cm1 = 378125999
 cm1# = 378125999
 cm1$ = str(cm1#)

 cm2 = 378125900 
 cm2# = 378125900
 cm2$ = str(cm2#)

 cm3 = 378125199
 cm3# = 378125199
 cm3$ = str(cm3#)

 cm4 = 398125999
 cm4# = 398125999
 cm4$ = str(cm4#)


do
  
    if getrawkeystate(27)=1 then end
    Print("cm1:  " + str(cm1))
	Print("cm1#: " + str(cm1#))
	Print("cm1$:  " + cm1$)
 	Print("=============")
    
	Print("cm2:  " + str(cm2))
	Print("cm2#: " + str(cm2#))
	Print("cm2$:  " + cm2$)
  	Print("=============")
    
    Print("cm3:  " + str(cm3))
	Print("cm3#: " + str(cm3#))
	Print("cm3$:  " + cm3$)
   	Print("=============")
   
	Print("cm4:  " + str(cm4))
	Print("cm4#: " + str(cm4#))
	Print("cm4$:  " + cm4$)

	
    Print( ScreenFPS() )
    sync()
loop

LynxJSA's web games/quizzes - LynxJSA's Android apps
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"Stick to a single main loop (DO...LOOP) and loop through it every frame.
Do everything inside functions.
Use finite state machines to control your game.
Use lots and lots of source files.
Use virtual resolution instead of the default percentage system." - Digital Awakening

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Kevin Picone

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Joined: 27th Aug 2002

Location: Australia

Posted: 29th May 2021 14:57

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cm# = 378125199

This code is assigning an INTEGER literal on the right hand side to a FLOAT (FLOATING POINT) value on the left hand side. If you print CM# it'll convert the FLOAT to a string which has decimal places, these will be zeros given the original conversion was from an Integer. Plenty of solutions, like you could INT() the value prior to display, or just keep CM integer.. etc

Print( int(Cm#) )

PlayBASIC To HTML5/WEB - Convert PlayBASIC To Machine Code

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n00bstar

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Joined: 9th Feb 2004

Location: Montreal, Canada.

Posted: 29th May 2021 15:10 Edited at: 29th May 2021 15:12

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From the guide:

Quote: "Note that whilst the range for Real numbers is very large its accuracy is limited to 7 significant figures. So you could represent 143670000.0 or 0.000053712, each has 5 significant figures, but not both in the same value 143670000.000053712 as the combined value has 18 significant figures. If you tried to store such a value it would be rounded to 143670000.0"

So anything above 7 significant numbers will be rounded up/down/sideways/quantum entangled/teleported/summoned from another dimension/etc

+ Code Snippet

A# = 378125999
B# = 3781259
C# = 9999999
D# = 99999999
E# = 1.000001
F# = 1.0000001



do
    
	Print(A#)
	Print(B#)
	Print("")
	Print(C#)
	Print(D#)
	Print("")
	Print(E#)
	Print(F#)

    Sync()
loop

-----------------------------------------------------------------------------
We all got a chicken duck woman thing waiting for us

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zxretrosoft

AGK Developer

9

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Joined: 10th Dec 2014

Location: Prague, Czech Republic

Posted: 29th May 2021 15:10

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Friends, thank you for your support and answers!

@Kevin Picone
Unfortunately, this is not a valid instruction in AGK.

Still: Conversion to INT also doesn't work.

+ Code Snippet

	cm# = 378125999
	cmint = cm#
	print(cmint)

I am sorry for poor English

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Loktofeit

AGK Developer

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Joined: 21st Jan 2009

Location: Sarasota, FL

Posted: 29th May 2021 15:56

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"So anything above 7 significant numbers will be rounded up/down/sideways/quantum entangled/teleported/summoned from another dimension/etc" - noobstar

I LOL'd.

LynxJSA's web games/quizzes - LynxJSA's Android apps
AGK Resource Directory
"Stick to a single main loop (DO...LOOP) and loop through it every frame.
Do everything inside functions.
Use finite state machines to control your game.
Use lots and lots of source files.
Use virtual resolution instead of the default percentage system." - Digital Awakening

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Kevin Picone

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Joined: 27th Aug 2002

Location: Australia

Posted: 30th May 2021 15:03

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Quote: "Unfortunately, this is not a valid instruction in AGK."

try Floor()

But I suspect your hitting precision errors when converting an integer that big, since floats are lossy and are stored as a type of approximation (for want of better word) , allowing them great numeric range with the same number of bits as the integer, but the trade off is precision, so some information is lost when converting from Integer to Float and vice versa.

PlayBASIC To HTML5/WEB - Convert PlayBASIC To Machine Code

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EdzUp

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Location: UK

Posted: 30th May 2021 19:58

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Unfortunately it is not just AppGameKit that has this issue C has been having the same problems since it started decades ago. Basically always use the right variable for the maximum number you wish to store in it

Integers for whole numbers, floats for floating point calculations. C++ introduced double and long long for huge numbers but the trade off is space a standard int is four bytes but a long long is eight as is a double.

If your making any sort of program ALWAYS know limits of variables this way you won't be scratching your head when your unsigned char won't go beyond 0 to 255