How can we obtain formatted output using p function. of ruby.
I need to print a float with exactly two decimal places.
I want to do it using minimum characters so i want to use p function instead of puts and printf.
i have tried this
printf"%.2f",a.abs/2
Any idea on how to reduce characters ?
inspect is the method you need to override for p
class Float
def inspect
sprintf "%.2f", self
end
end
Result
p 12.0
#=> 12.00
Assuming you're ok about a string being returned, you can use use Kernel#sprintf
sprintf "%.2f", 1.234
=> "1.23"
Note that printf is really just sugar for IO.write(sprint()) so the above should be considered equiavelent.
You can use the method String#%
str % arg → new_str
Format—Uses str as a format specification, and returns the result of applying it to arg. If the format specification contains more than one substitution, then arg must be an Array or Hash containing the values to be substituted. See Kernel::sprintf for details of the format string.
In your example:
a = 5.3
p"%.2f"%a
If you use a formula you need additional braces:
p"%.2f"%(a.abs/2)
