Functions — Question 29

Write a Python function to calculate the factorial of a number (a non-negative integer). The function accepts the number whose factorial is to be calculated as the argument.

def factorial(n):
    product = 1
    for i in range(1, n + 1):
        product *= i
    return product

n = int(input("Enter a number: "))
fact = factorial(n)
print("The factorial of", n, "is", fact)

Enter a number: 5
The factorial of 5 is 120.


Enter a number: 0
The factorial of 0 is 1.