How to make "pretty rounding"?

Question

I need to do a rounding like this and convert it as a character:

as.character(round(5.9999,2))

I expect it to become 6.00, but it just gives me 6

Is there anyway that I can make it show 6.00?

Answer 1

Try either one of these:

> sprintf("%3.2f", round(5.9999, digits=2))
[1] "6.00
> sprintf("%3.2f", 5.999)  # no round needed either
[1] "6.00

There are also formatC() and prettyNum().