Python program to find factorial of a number

Description: Write a Python program to find the factorial of a number using a loop.

Rules and hints:

• Factorial of 5 is 5 x 4 x 3 x 2 x 1 = 120.
• Start with 1 and multiply by each number.

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Python program for factorial using a loop

num = 5
factorial = 1

for i in range(1, num + 1):
    factorial = factorial * i

print("Factorial of", num, "is", factorial)

Output:

How it works

• factorial starts with 1.
• The loop multiplies it with 1, 2, 3, 4 and 5 one by one: 1, 2, 6, 24, 120.
• For 0, the loop does not run, and the answer stays 1, which is correct.

You can also solve it with a function that calls itself. See Python Functions (recursion).

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