translate r code to c++ code

I have the following r code, which needs to be translated into c++ code.

f <- function(x) 
exp(x) - x^4

uniroot(f, c(0, 3))

rosenbrock <- function(x) 
  (1-x[1])^2 +100*(x[2]-x[1]^2)^2

optim(c(0,0), rosenbrock, method = "BFGS")

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