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Add Lesson 2 Task 4

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Stanislav Mykhailenko 2022-10-27 18:54:57 +03:00
parent ca319994ca
commit 0b11b0477f
Signed by: stanislavmykhailenko
GPG key ID: 1E95E66A9C9D6A36
1 changed files with 20 additions and 0 deletions
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# Lesson 2 Task 4: get number factorial
# Author: Stanislav Mykhailenko
# License: Unlicense
# Return codes:
# 0 - OK
# 1 - Invalid number entered
import math, sys
def numberError():
print("Invalid number entered.")
sys.exit(1)
try: number = int(input("Enter a natural number: "))
except ValueError: numberError()
if number < 1: numberError()
print(str(number) + " factorial is " + str(math.factorial(number)))