Authors:
Tony Gaddis
Chapter:
Value Returning Functions And Modules
Exercise:
Programming Exercises
Question:8 | ISBN:9780132576376 | Edition: 2
Question
Prime Numbers
A prime number is a number that is only evenly divisible by itself and 1. For example, the number 5 is prime because it can only be evenly divided by 1 and 5. The number 6, however,
is not prime because it can be divided evenly by 1, 2, 3, and 6. Write a Boolean function named is_prime which takes an integer as an argument and
returns True if the argument is a prime number, or False otherwise. Use the function in a program that prompts the user to enter a number and then displays a message indicating
whether the number is prime.
Answer
Prime Numbers Python code:
#The method Boolean function named is_prime
#which takes an integer as an argument and
#returns True if the argument is a prime
#number, or False otherwise.
def is_prime(number):
if number < 2:
return False
for i in range(2, int(number**0.5) + 1):
if number % i == 0:
return False
return True
# Prompt and read the input from the user
number = int(input("Enter a number: "))
# Checking if the number is prime
if is_prime(number):
print(number, "is a prime number.")
else:
print(number, "is not a prime number.")
Executed Output 1:
Enter a number: 15
15 is not a prime number.
Executed Output 2:
Enter a number: 11
11 is a prime number