Create areal

* C++
* Haskell
* JavaScript (Node.js)
* Python
* Ruby

areal.cpp

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+// GitHub: EntityPlantt/Kattis
+#include <iostream>
+#include <cmath>
+using namespace std;
+int main() {
+    long double n;
+    cin >> n;
+    cout.precision(20);
+    cout << sqrt(n) * 4.0;
+    return 0;
+}

areal.hs

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+-- GitHub: EntityPlantt/Kattis
+main = do 
+	n <- getLine
+	let x = (read n :: Double)
+	print(sqrt x * 4)

areal.js

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+// GitHub: EntityPlantt/Kattis
+require("readline").createInterface({input: process.stdin}).on("line", n => {
+	console.log(Math.sqrt(parseFloat(n)) * 4);
+});

areal.py

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+# GitHub: EntityPlantt/Kattis
+import math
+print(math.sqrt(float(input())) * 4)

areal.rb

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+# GitHub: EntityPlantt/Kattis
+puts Math.sqrt($stdin.read.to_f) * 4.0