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Update Lesson 2 Task 4 to work without libraries

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This commit is contained in:
Stanislav Mykhailenko 2023-01-04 01:03:02 +02:00
parent 35addea923
commit 6c4c9ac3c0
Signed by: stanislavmykhailenko
GPG key ID: 1E95E66A9C9D6A36
1 changed files with 10 additions and 15 deletions
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Lesson_2/task4.py
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@ -2,24 +2,19 @@
# Author: Stanislav Mykhailenko
# License: Unlicense
# Return codes:
# 0 - OK
# 1 - Invalid number entered
import sys
def numberError():
print("Invalid number entered.")
sys.exit(1)
error = False
try: number = int(input("Enter a natural number: "))
except ValueError: numberError()
except ValueError: error = True
if number < 1: numberError()
if not error and number < 1: error = True
factorial = 1
if not error:
factorial = 1
for i in range(2, number + 1):
factorial = factorial * i
for i in range(2, number + 1):
factorial = factorial * i
else:
print(str(number) + " factorial is " + str(factorial))
else:
print(str(number) + " factorial is " + str(factorial))
print("Invalid number entered.")