Factorial of a Number Using Functions in Python

A very simple program to show you how to perform factorial of a given number by the user using functions in Python

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Sample Program Output

Program Output

# factorial.py

# Rollyn M. Moises and Jake R. Pomperada

# February 25, 2019    Tuesday

# Bacolod City, Negros Occidental

def factorial(number):

    solve_results = 1

    for i in range(2, number + 1):

        solve_results *= i

    return solve_results

def my_program():

  print();

  print("\t@==================================@")

  print("\t      Factorial of a Number     ")

  print("\t@==================================@")

  print();

  value = int(input("\tEnter a Number : "))

  print("");

  if value < 0:

    print("\tSorry, factorial does not exist for negative numbers")

  elif value == 0:

    print("\tThe factorial of 0 is 1")

  else:

    print("\tThe factorial of",value,"is",factorial(value))

  print();

  repeat = input('\tDo you want to continue ? (Y/N) : ')

  if repeat.upper() == "N":

      print()

      print("\tThank You For Using This Program.")

      print();

      print("\tEND OF PROGRAM");

      quit

  if repeat.upper() == "Y":

      my_program()

if __name__ == '__main__':

    my_program()