Display exact value of a variable in R

Question

> x <- 1.00042589212565
> x
[1] 1.000426

If I wanted to print the exact value of x, how would I do it?

Sorry if this

Answer 1

print(x, digits=15)

or

format(x, digits=15)

or

sprintf("%.14f", x)

Answer 2

Globally solution during all the session

options(digits=16)
> x
[1] 1.00042589212565

or locally just for x:

sprintf("%.16f", x)
[1] "1.0004258921256499"