1 files changed, 41 insertions, 0 deletions
diff --git a/data/en/math/factorial b/data/en/math/factorial
new file mode 100644
index 0000000..95d0cd4
--- /dev/null
+++ b/data/en/math/factorial
@@ -0,0 +1,41 @@
+import time
+
+
+def factorial_recursive(number):
+    """ Define a factorial function in recursive flavor """
+    result = 1
+    if number > 0:
+        result = number * factorial_recursive(number - 1)
+        print 'factorizing: ', number, ' result: ', result
+    return result
+
+
+def factorial_iterative(number):
+    """ Define a factorial function in iterative flavor """
+    result = 1
+    for i in range(1, number + 1):
+        result = result * i
+        print 'factorizing: ', i, ' result: ', result
+    return result
+
+
+def calculate(number, type):
+    """ Calculate factorial using recursive and iterative methods """
+    start = time.time()
+    if type == 0:
+        type_s = 'recursive'
+        factorial_recursive(number)
+    else:
+        type_s = 'iterative'
+        factorial_iterative(number)
+    delta = time.time() - start
+    if delta > 0:
+        print 'Type: ', type_s, ' in: ', 1 / delta
+    else:
+        print 'Type: ', type_s
+
+# ask for a number to compute the factorial of
+number = input('Please input a number:')
+print 'Calculating...'
+calculate(number, 0)
+calculate(number, 1)