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Index › Programming Questions & Help › Syntax Questions › PApplet.parseInt
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PApplet.parseInt (Read 1308 times)
chevy1
PApplet.parseInt
May 8th, 2009, 3:58am  
Can anyone explain to me where to use this code? and what it does?

Any advice would be gratefully recieved.

Thanks
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PhiLho 
Re: PApplet.parseInt
Reply #1 - May 8th, 2009, 5:43am  
I would be curious why you ask that (and where you saw it)...

Actually, if you write a simple sketch like:
Code:
String s = "4564.4";
int n = int(s);

println(n);

Processing will generate the following Java code:
Code:
String s = "4564.4";
int n = PApplet.parseInt(s);

println(n);

noLoop();

(in a generated setup() function), using the Antlr pre-processor.
So basically you can just look the int() reference to see what parseInt() does. That's just an (hidden) implementation detail.

I think this pre-processing step is necessary (for int(), float() and similar casting functions) because these are Java reserved words, so one cannot use them as function names.
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nootropic.kint
Re: PApplet.parseInt
Reply #2 - May 10th, 2009, 9:03am  
Where can be founded theese kind of hidden implementation details?
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hansi
Re: PApplet.parseInt
Reply #3 - May 10th, 2009, 9:34am  
you can browse the javadocs,
http://dev.processing.org/reference/everything/index.html
(click on PApplet in the left frame and then start looking for parseInt)
or you can look at the source directly:
http://dev.processing.org/source/index.cgi/trunk/processing/core/src/processing/core/PApplet.java?view=markup

however, you can't rely on every function listed there, some might be changed or removed in the future.... (i guess the rule is "everything that's not in the normal reference might change at any point").
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