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Asked: 2026-05-27T01:53:32+00:00

%.3f.format(1) returns 1.000 . %.3f.format(4.0/3.0) returns 1.333 . Is there some easy way to

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"%.3f".format(1) returns 1.000.
"%.3f".format(4.0/3.0) returns 1.333.

Is there some easy way to have these return 1 and 1.333? I thought the standard printf format specified that precision as the maximum already, but apparently not in Scala.

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  1. Editorial Team

    The default formatter used by printf seems to be a generic one that doesn’t have all the same support than [DecimalFormat][1]. You can instantiate a custom formatter along those lines:

    scala> import java.text.DecimalFormat 
import java.text.DecimalFormat

scala> val formatter = new DecimalFormat("#.###")
formatter: java.text.DecimalFormat = java.text.DecimalFormat@674dc

scala> formatter.format(1)
res36: java.lang.String = 1

scala> formatter.format(1.34)
res37: java.lang.String = 1.34

scala> formatter.format(4.toFloat / 3)
res38: java.lang.String = 1.333

scala> formatter.format(1.toFloat)
res39: java.lang.String = 1

    See: http://docs.oracle.com/javase/tutorial/java/data/numberformat.html for more information.

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