The formatC
function is very flexible, but has a complicated interface. Take a look at it using sig(formatC)
.
Write a function that calls formatC
to print currency values in US dollars. (Values should be prefixed with a $
symbol, be in fixed rather than scientific format, and have two decimal places. For example, $999.99
.) Hints: The digits
argument specifies the number of decimal places, and format = "f"
denotes fixed format.
All you need is paste0
and formatC
.
format_as_usd <- function(x)
{
paste0("$", formatC(x, digits = 2, format = "f"))
}
Usage is as
format_as_usd(999999.999)
## [1] "$1000000.00"