In this tutorial, we will discuss a Python program to find the factorial of a given number using iteration.

The factorial of a non-negative integer $n$ is the product of all positive integers less than or equal to $n$.

Related: Python Program to find the Sum of Arithmetic Progression

Program code for Factorial of a number using Iteration in Python

# Factorial Using Iteration in Python
def factorial(num):
result = 1
for i in range(1, num + 1):
result *= i
return result

number = int(input("Enter a number: "))
print(f"The factorial of {number} is {factorial(number)}.")

Explanation

1. Function Definition: The factorial function takes an integer num as input and returns the factorial of the number using iteration.
2. Main Program: The program prompts the user to enter a number and then calculates the factorial using the factorial function and prints the result.

Output

• When you run the above program, it will prompt you to enter a number. After entering the number, it will calculate the factorial using iteration and print the result.

Conclusion

• In this tutorial, we learned how to find the factorial of a given number using an iterative approach in a Python program. Understanding this concept is essential for solving various mathematical problems and competitive programming challenges.