19 lines
784 B
Markdown
19 lines
784 B
Markdown
Factorial!
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==========
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Get the factorial of a given number. Using sys.argv, pass in a number and return it's factorial.
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To calculate the factorial of 5, for example, the equation is ```5 * 4 * 3 * 2 * 1 = 120```
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#### Iterative
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Write the equation iteratively, using a for or while loop. How to use loops in Python is well documented [here](https://docs.python.org/3.4/tutorial/controlflow.html)
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#### Bonus
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Write this function [recursively](http://en.wikibooks.org/wiki/Non-Programmer%27s_Tutorial_for_Python_3/Recursion). If you run into difficulty, think about how your stack will develop as your function recurses and remember to define your base case.
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Write assert statements to test your code in both cases.
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[Wikipedia on Factorials](http://en.wikipedia.org/wiki/Factorial)
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