Given a number n, write a formula that returns n! (n factorial). Incase you don't know what a factorial is, n! = n * (n - 1) * (n - 2) * ... 2 * 1. For example: 5! = 5 * 4 * 3 * 2 * 1 = 120 so we'd ...
Calculates the factorial of a non-negative integer. Prompts the user to input the integer. Validates the input to ensure it is a non-negative integer. You can ...
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