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Index › Programming Questions & Help › Syntax Questions › printf alternative
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printf alternative (Read 1234 times)
pixelPusher
printf alternative
Dec 6th, 2009, 12:21am  
hi i have serial input which i need to convert to float.
the docs mention converting using printf/scanf to format
can println do this? and where is the parseFloat documentation?

i currntly use
Code:

println(myString);
String[] list = trim(split(myString, ',')); 
for(int iii=1;iii<8;iii++){
	println(" <var"+iii+": "+Float.parseFloat(list[iii]));
}

printf/scanf | example
%+07.2f | +082.76
%+09.6f | +0.053362
%+07.4f | -0.3647
%+07.3f | -09.091
%+08.4f | +00.0017
%+13.6E | +9.801470E-01
%+13.6E | +8.135935E-02
%+13.6E | +4.968087E-06
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PhiLho 
Re: printf alternative
Reply #1 - Dec 6th, 2009, 2:37am  
"the docs mention converting using printf/scanf to format"
Which docs That's (typically) C/C++ functions, not Java. And scanf won't format, it parses formatted text.

Processing has nf() functions and friends.
For more precision, Java has the Formatter class, equivalent to printf, accessible via String.format method.
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Jo Wood
Re: printf alternative
Reply #2 - Dec 6th, 2009, 4:40am  
Actually Java, and therefore Processing, has had printf() for a while now (since 1.5). It can be used exactly the same way as its C/C++ counterparts. See Java's printf() documentation.

This works perfectly well in Processing if you prefer it to nf() or Formatter, for example,

Quote:
float number = 123.456789;

System.out.printf("%7.2f",number);


Having said that, if you are converting input rather than outputting to the screen or other stream, you may be better off with the alternatives that PhiLho suggested.
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