Solution to problem 40 in Julia

src/Julia/Problem040.jl

@@ -0,0 +1,40 @@
+#=
+Created on 10 Sep 2021
+
+@author: David Doblas Jiménez
+@email: daviddoji@pm.me
+
+Solution for Problem 40 of Project Euler
+https://projecteuler.net/problem=40
+=#
+
+using BenchmarkTools
+
+function Problem40()
+    #=
+    An irrational decimal fraction is created by concatenating the positive integers:
+
+        0.123456789101112131415161718192021...
+
+    It can be seen that the 12th digit of the fractional part is 1.
+
+    If d_n represents the n^th digit of the fractional part, find the value of the following expression.
+
+        d_1 × d_{10} × d_{100} × d_{1_000} × d_{10_000} × d_{100_000} × d_{1_000_000}
+
+    =#
+    ans = 1
+    fraction = join([i for i in 1:1_000_000])
+
+    for i in 0:6
+         ans *= parse(Int, fraction[10^i])
+    end
+
+    return ans
+end
+
+
+println("Time to evaluate Problem 40:")
+@btime Problem40()
+println("")
+println("Result for Problem 40: ", Problem40())