Limiting decimals on a float output

[ScarletSkyFury]

Okay so basicaly I want the result of calculation to come out with max 2 decimals

Eg. 23.55 and not 23.556849

Any ideas?

Thanks in advanced

[HeavenAgain]

System.out.printf("%.2f",23.556849);
or look up Math.round , but printf is better

[Tony]

well Math.round will... round. printf is used for formatting. The latter is probably a better approach in this case.

[ScarletSkyFury]

Im using JOptionPane ><'

[HeavenAgain]

code:

import java.util.Formatter; Formatter formatter = new Formatter(); formatter.format("%.2f",23.556849);

check out the api on formatter class

[syntax_error]

err am I allow to ask a question related on the same topic here
if not please forgive me
but I was trying the printf
and i wanted to do something such as this

Java:

double qwer=12.34234; System.out.printf("%.2d",qwer);

and i do not get any syntax error however when i try to run the program
i get this error

Quote:

IllegalFormatPrecisionException: 2
at java.util.Formatter$FormatSpecifier.checkInteger(Unknown Source)
at java.util.Formatter$FormatSpecifier.<init>(Unknown Source)
at java.util.Formatter.parse(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.io.PrintStream.format(Unknown Source)
at java.io.PrintStream.printf(Unknown Source)
at QWER.main(QWER.java:4)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)

can i not format a double or something? [/quote]

[HeavenAgain]

d doesnt not stand for double, it stands for "digit" or something like that, it have to be a "number without floating point", for decimal value, you use %f instead
so your code would be something like

Java:

double qwer=12.34234; System.out.printf("%.2f",qwer);

there are also a few other ones, like %s (String), %X , %x (hex in upper- or lower-case), %o (octol), %f (floating point, it round up), %d (int).... check the api

[McKenzie]

For the record the d in %d stands for decimal. As in binary, octal, decimal, hexadecimal. It's a throw-back from C. In C it was no big deal because float was the default real number. If you do want to use round it looks like Math.round(x * 100) / 100 (printf is still a better call).

[syntax_error]

omg that was a very stupid mistake by me
thank you all very much