Algorithm
Input:
Accept a number as input from the user.
Function Definition:
Define a function factorial that takes a parameter n.
Base Case:
If n is 0 or 1, return 1 (base case for factorial).
Recursive Case:
If n is greater than 1, calculate n! recursively as n * factorial(n-1).
User Input:
Take a number from the user as input.
Calculate Factorial:
Call the factorial function with the user-input number.
Output:
Print the result, indicating the factorial of the input number.
Code Examples
#1 Example- Write a Python program to calculate the factorial of a number input by the user using the factorial () function.
Code -
Python Programming
import math
n = int (input (“Enter the number whose factorial you want to find: ”))
print (“The factorial of the number is: “)
print (math.factorial (n))
#2 Example - Write a program to calculate the factorial of a number in Python using FOR loop.
Code -
Python Programming
n = int (input (“Enter a number: “))
factorial = 1
if n >= 1:
for i in range (1, n+1):
factorial = factorial *i
print (“Factorial of the given number is: “, factorial)
#3 Code Example with Python Programming
Code -
Python Programming
n = int (input (“Enter the number for which the factorial needs to be calculated: “)
factorial = 1
if n < 0:
print (“Factorial cannot be calculated, non-integer input”)
elif n == 0:
print (“Factorial of the number is 1”)
else:
for i in range (1, n+1):
factorial = factorial *i
print (“Factorial of the given number is: “, factorial)
#4 Example- Write the Python program to calculate the factorial of a number using recursion.
Code -
Python Programming
n = int (input (“Enter the number for which the factorial needs to be calculated: “)
def rec_fact (n):
if n == 1:
return n
elif n < 1:
return (“Wrong input”)
else:
return n*rec_fact (n-1)
print (rec_fact (n))
Demonstration
Python Programing Example to Find the Factorial of a Number-DevsEnv