Calculate e by drawing random numbers

e.jl

#!/usr/bin/env julia

using Random

function play()
    r=0.0
    counter=0.0
    while r<1.0
        r+=rand(Float64)
        counter+=1.0
    end
    return counter
end

function drive(N::Int64)
    e=0.0
    for _ in 1:N
        e+=play()
    end
    println(e/N)
end

@time drive(length(ARGS)==1 ? parse(Int64,ARGS[1]) : 1000)