How to Find the Factorial of a Number in Python
In this tutorial, we will program 'How to Find the Factorial of a Number in Python.' We will learn how to calculate the actual factorial of a number. The objective is to teach you how to easily identify the factorial of a given number. I will provide a sample program to demonstrate the actual coding process in this tutorial.
This topic is very easy to understand. Just follow the instructions I provide, and you can do it yourself with ease. The program I will show you covers the basics of programming to get the factorial of a number. I will do my best to provide you with a simple method for calculating the factorial of a number. So, let's start with the coding.
Getting Started:
First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.
Creating Main Function
This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.- def factorial(n):
- if n < 0:
- return 0
- elif n == 0 or n == 1:
- return 1
- else:
- fact = 1
- while(n > 1):
- fact *= n
- n -= 1
- return fact
- ret = False
- while True:
- print("\n================== Find the Factorial of a Number ==================\n\n")
- num = int(input("Enter a number: "))
- print("Factorial of",num,"is",
- factorial(num))
- opt = input("\nDo you want to try again?(yes/no): ")
- if opt.lower() == 'yes':
- ret=False
- elif opt.lower() == 'no':
- ret=True
- print("Exiting program....")
- else:
- print("Please enter yes/no:")
- break
- if ret == False:
- continue
This script calculates the factorial of a user-provided number. It repeatedly prompts the user to input a number, calculates the factorial using an iterative method, and displays the result. After each calculation, the user is asked if they want to try again, allowing them to either continue or exit the program.
Output:
There you have it we successfully created How to Find the Factorial of a Number in Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!
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