factorial

README.md

@@ -12,6 +12,7 @@
 ### :heavy_division_sign: Math
 
 <details><summary>View contents</summary> <ul><li><a href = "#average"><code>average</code></a></li>
+<li><a href = "#factorial"><code>factorial</code></a></li>
 <li><a href = "#gcd"><code>gcd</code></a></li>
 <li><a href = "#lcm"><code>lcm</code></a></li>
 <li><a href = "#max_n"><code>max_n</code></a></li>
@@ -68,6 +69,34 @@ average(1, 2, 3) # 2.0
 
 <br><a href = "#table-of-contents">:arrow_up: Back to top</a>
  
+### factorial
+
+Calculates the factorial of a number.
+
+Use recursion. If `num` is less than or equal to `1`, return `1`. Otherwise, return the product of `num` and the factorial of `num - 1`. Throws an exception if `num` is a negative or a floating point number.
+
+```py 
+
+
+def factorial(num):
+    if not ((num >= 0) & (num % 1 == 0)):
+        raise Exception(
+            f"Number( {num} ) can't be floating point or negative ")
+    return 1 if num == 0 else num * factorial(num - 1)
+
+ 
+ ```
+<details><summary>View Examples</summary>
+
+```py
+
+factorial(6) # 720
+
+```
+</details>
+
+<br><a href = "#table-of-contents">:arrow_up: Back to top</a>
+ 
 ### gcd
 
 :information_source: `math.gcd` works with only two numbers

snippets/factorial.md

@@ -6,6 +6,7 @@ Use recursion. If `num` is less than or equal to `1`, return `1`. Otherwise, ret
 
 ```python 
 
+
 def factorial(num):
     if not ((num >= 0) & (num % 1 == 0)):
         raise Exception(
@@ -13,3 +14,6 @@ def factorial(num):
     return 1 if num == 0 else num * factorial(num - 1)
 
 ```
+``` python
+factorial(6) # 720
+```

tag_database

@@ -5,6 +5,7 @@ count_occurences:list
 count_vowels:string
 deep_flatten:list
 difference:list
+factorial:math
 gcd:math
 lcm:math
 max_n:math