To understand this example, you should have the knowledge of following Python programming topics:
The factorial of a number is the product of all the integers from 1 to that number.
For example, the factorial of 6 (denoted as 6!) is 1*2*3*4*5*6 = 720. Factorial is not defined for negative numbers and the factorial of zero is one, 0! = 1.
# Python program to find the factorial of a number using recursion
"""Function to return the factorial
of a number using recursion"""
if n == 1:
# Change this value for a different result
num = 7
# uncomment to take input from the user
#num = int(input("Enter a number: "))
# check is the number is negative
if num < 0:
print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
print("The factorial of 0 is 1")
print("The factorial of",num,"is",recur_factorial(num))
The factorial of 7 is 5040
Note: To test the program, change the value of num.
Here, the number is stored in num and use recursive function recur_factorial() to compute the product up to that number.