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

Question

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')

question from:https://stackoverflow.com/questions/838064/only-show-decimal-point-if-floating-point-component-is-not-00-sprintf-printf

Answer 1

You want to use %g instead of %f:

"%gx" % (factor / 100.00)