Write a function factorial(n) that returns the factorial of a number.

 

def factorial(n):

    if n == 0 or n == 1:

        return 1 

    result = 1

    for i in range(2, n + 1):  

        result *= i  

    return result

print(factorial(5))  

print(factorial(3))  

print(factorial(0))  

#source code --> clcoding.com 

Code Explanation:

Define the Function:

def factorial(n): → Defines the function, which takes n as input.

Handle Base Case (0 and 1):

if n == 0 or n == 1: return 1 → Since 0! = 1! = 1, return 1.

Initialize result to 1

result = 1 → This variable will store the factorial value.

Loop from 2 to n:

for i in range(2, n + 1): → Iterates through numbers from 2 to n.

result *= i → Multiplies result by i in each step.

Return the Final Result:

return result → Returns the computed factorial.

Example Output

120

6

1