Hello people, welcome to Programming In Python! I am back to discuss how to find the factorial of a given number in Python.
Generally, a factorial on a given number is given by calculating its product with all the numbers below it.
Factorial is represented as `!`
For Example : 4! = 4 * 3 * 2 * 1 = 24
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Task :
To find the factorial of a given number.
Approach :
- Read the input number for which the factorial is to be found using
input()orraw_input(). - Check whether the input number is negative and show an appropriate message
- If the number entered is 0, print the factorial as 1
- When the entered number is a positive integer and greater than 1, initialize a variable factorial as 1 then run a for loop from 1 to the number+1
- Calculate the factorial as factorial * i
- Print the result
Factorial – Code Visualization
Program :
num = int(input("Enter a number: "))
factorial = 1
if num < 0:
print("Please enter a positive integer")
elif num == 0:
print("The factorial of 0 is 1")
else:
for i in range(1, num + 1):
factorial *= i
print("The factorial of", num, "is", factorial)
Output :
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That is it for this post, hope you understood how to write a program to find the factorial of a number in Python. For more such math-related programs check this link.