use Python) Use the Design Recipe to write a function factorial that when given a positive integer calculates the factorial. If given a negative integer or not an integer), the function should return None. If given 0, it should return 1. Include a docstring!

use Python) Use the Design Recipe to write a function factorial that when given a positive integer calculates the factorial. If given a negative integer or not an integer), the function should return None. If given 0, it should return 1. Include a docstring!

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter6: Modularity Using Functions

Section: Chapter Questions

Problem 7PP: (Numerical) Heron’s formula for the area, A, of a triangle with sides of length a, b, and c is...

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Concept explainers

Types of Function

A function is a process or task that does some operation in the program. Some programming languages may contain built-in functions for certain commonly used tasks. Most programming languages also support user-defined functions, which means a user can write their own function to perform some operation. There are some libraries or header files that contain built-in functions for performing certain tasks.

Question

The factorial of a (positive) integer is the product of each of the integers from 1 to the given integer.

For example, 3! = factorial(3) = 3*2*1 = 6.

(use Python) Use the Design Recipe to write a function factorial that when given a positive integer calculates the factorial. If given a negative integer or not an integer), the function should return None. If given 0, it should return 1.

Include a docstring!

Note: You may assume all arguments passed to this function will be numeric.

Write three assert_equal statements to test your function.

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