Question

Only show decimal point if floating point component is not .00 sprintf/printf

I am pretty formatting a floating point number but want it to appear as an integer if there is no relevant floating point number.

I.e.

  • 1.20 -> 1.2x
  • 1.78 -> 1.78x
  • 0.80 -> 0.8x
  • 2.00 -> 2x

I can achieve this with a bit of regex but wondering if there is a sprintf-only way of doing this?

I am doing it rather lazily in ruby like so:

("%0.2fx" % (factor / 100.0)).gsub(/\.?0+x$/,'x')
 45  19406  45
1 Jan 1970

Solution

 51

You want to use %g instead of %f:

"%gx" % (factor / 100.00)
2009-05-08

Solution

 30

You can mix and match %g and %f like so:

"%g" % ("%.2f" % number)
2012-03-08