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# Write a factorial method that takes an integer as a paraemeter and returns the result

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From: Srinivasan P.
Python has a built-in function named factorial under the math module. The following script calculates the factorial of any number using a built-in factorial function. In this script, any valid integer number will be taken as the input, and the function will calculate the factorial value of that number and print the factorial value of the input number. The following script shows how you can calculate the factorial of any number without using any built-in function in Python.

## Program for factorial of a number - GeeksforGeeks

In this example, you will learn to find the factorial of a non-negative integer entered by the user using recursion. To understand this example, you should have the knowledge of the following C programming topics:. The factorial of a negative number doesn't exist. And the factorial of 0 is 1.

### factorial() in Python

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I was given a hint to write the function in forEach first and then rewrite it with range and reduce. This was my attempt. I know it's a mess but my questions are, how can i using forEach when n is just a number and forEach is for arrays?
This will be a closed book quiz. You may bring one 8. The purpose of this quiz is to have you demonstrate that you can write an elementary Java method correctly, using my definition of "elementary". A vector has automatic methods for growing and shrinking the vector, so is easier to use in situations where you need to change the size.

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