Simple rounding question

[sae]

How can I round a number to a certain number of decimal places?

i.e. if I wanted to round 3.141593456098 to three decimal places it would be 3.142. Is there an easy way to do this?

[javasweeper]

Try BigDecimal if it suits your requirement. It has rounding and scaling options.
http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigDecimal.html

[agent_x91]

Math may also be appropriate if you wish to round it.


//round d to x decimal places

double rounded=(double)(Math.pow(10,x)/Math.round(Math.pow(10,x)*d));


Hope that helps.

[sae]

I ended up using DecimalFormat although I really like agent x91's thinking :D

[agent_x91]

:cool:

[coop5885]

if nothing else you can format it in the output string using %.2f. just another solution