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Create Add factorial function utility #4288

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18 changes: 18 additions & 0 deletions Add factorial function utility
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# factorial.py

def factorial(n):
"""
Calculate the factorial of a non-negative integer n.
Returns 1 if n is 0.
"""
if n < 0:
raise ValueError("Input must be a non-negative integer")
result = 1
for i in range(1, n + 1):
result *= i
return result


# Example usage
if __name__ == "__main__":
print(f"Factorial of 5 is {factorial(5)}")