Factorial of a Number Using Functions in Python

Write a program that will ask the user to give a number and then the program will compute its factorial value of the given number and display the result on the screen. The program also asks the user if the user will continue using the program or not. If the user chooses Y for yes the program will run again but if the user chooses N for no the program will display a thankful message and return to the operating system.

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Program Listing

# 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()