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NG_2022_Stanislav_Mykhailenko/Lesson_2/task4.py
2023-01-24 02:37:00 +02:00

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403 B
Python

# Lesson 2 Task 4: get number factorial
# Author: Stanislav Mykhailenko
# License: Unlicense
try:
number = int(input("Enter a natural number: "))
if number < 1:
raise ValueError("A natural number is required.")
factorial = 1
for i in range(2, number + 1):
factorial = factorial * i
print(str(number) + " factorial is " + str(factorial))
except ValueError:
print("Invalid number entered.")