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# 🔍 1st method using modulus (%) operator

number = int(input("Enter a number: "))

if number % 2 == 0:

print(f"{number} is even")

else:

print(f"{number} is odd")

# 🔍 2nd method using bitwise AND operator (&)

number = int(input("Enter a number:"))

if number & 1: # this uses the least significant bit (LSB) to determine odd/even

# If the least significant bit is 1, the number is odd

# If the least significant bit is 0, the number is even

# For example, 5 in binary is 101, and the LSB is 1, so it's odd

# I find this method exciting :)

print(f"{number} is odd")

else:

print(f"{number} is even")

# 🔍 3rd method using functions (reusable code)

def is_even(n):

return n % 2 == 0

def is_odd(n):

return n % 2 != 0

def check_number(n):

if is_even(n):

return f"{n} is even"

elif is_odd(n):

return f"{n} is odd"

number = int(input("Enter a number: "))

print(check_number(number))

# 🔍 4th method using a lambda function

check_even_odd = lambda n: f"{n} is even" if n % 2 == 0 else f"{n} is odd" # is good for quick checks

number = int(input("Enter "))

print(check_even_odd(number))

# 🔍 5th method using a list comprehension

def check_even_odd_list(numbers): # this method is useful for checking multiple numbers at once

return [f"{n} is even" if n %2 == 0 else f"{n} is odd" for n in numbers]

numbers = [int(x) for x in input("Enter numbers separated by space: ").split()] # the .split() method splits the input string into a list of strings (based on spaces by default)

print(check_even_odd_list(numbers))

# 🔍 6th method using a map function

def check_even_odd_map(numbers):

return list(map(lambda n: f"{n} is even" if n % 2 == 0 else f"{n} is odd", numbers)) # map applies the lambda function to each element in the numbers list

numbers = [int(x) for x in input ("Enter numbers separated by space: ").split()]

print(check_even_odd_map(numbers))

# 🔍 7th method using a filter function

def filter_even(numbers):

return list(filter(lambda n: n % 2 == 0, numbers)) #filter returns only the even numbers from the list

numbers = [int(x) for x in input("Enter numbers separated by spaces: ").split()]

print(filter_even(numbers))

# ⌛️ Compare methods by time taken

import time

def time_function(func, *args):

start_time = time.time()

result = func(*args)

end_time = time.time()

print(f"Time taken: {end_time - start_time:.8f} seconds")

def main():

number = int(input("Enter a number: "))

print("\nUsing modulus operator:")

time_function(lambda n: f"{n} is even" if n % 2 == 0 else f"{n} is odd", number)

print("\nUsing bitwise AND operator:")

time_function(lambda n: f"{n} is odd" if n & 1 else f"{n} is even", number)

print("\nUsing functions:")

time_function(check_number, number)

print("\nUsing lambda function:")

time_function(check_even_odd, number)

numbers = [int(x) for x in input("Enter numbers separated by space: ").split()]

print("\nUsing list comprehension:")

time_function(check_even_odd_list, numbers)

print("\nUsing map function:")

time_function(check_even_odd_map, numbers)

print("\nUsing filter function:")

time_function(filter_even, numbers)

if __name__ == "__main__":

main()

stop = input("Press Enter to exit...")