Factorial Program in Python (Loop and Recursion)

The factorial of n (written n!) is the product of all numbers from 1 to n. Example: 5! = 120.

Python Program

# Using a loop
n = 5
f = 1
for i in range(1, n + 1):
    f *= i
print("Factorial:", f)

# Using recursion
def factorial(n):
    if n == 0:
        return 1
    return n * factorial(n - 1)
print("Recursive:", factorial(5))

Expected Output

How it Works

• Loop: multiply f by each number from 1 to n.
• Recursion: n! = n × (n-1)!, with base case 0! = 1.

Summary

• The factorial of n (written n!) is the product of all numbers from 1 to n. Example: 5! = 120.