Even Odd Program in Python (How to Check Number is Even or Odd?)

Are you tired of manually checking whether a number is odd or even

Let’s explore various ways to tackle this common programming task using Python. From traditional approaches using for loops and while loops to more concise solutions leveraging functions, lambda, arrays, and even the mighty ternary operator, we've got you covered.

We'll even delve into creative techniques that don't rely on the modulus operator. Whether you're a beginner or an experienced Pythonista, this guide will equip you with multiple ways to check if a number is odd or even in Python.

Odd or Even Program in Python

Code

# How to check if number is odd or even

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

if number % 2 == 0:
    print("The number is even")
else:
    print("The number is odd")

Output

Enter a number: 5
The number is odd

Explanation

In this program, we prompt the user to enter a number using the input() function. The input is converted to an integer using the int() function and stored in the variable number.

We use the modulo operator % to check if the number is divisible by 2. If the remainder of the division is 0, it means the number is even. If the remainder is not 0, it means the number is odd.

If the number is divisible by 2 (i.e., the remainder is 0), we print "The number is even".
If the number is not divisible by 2 (i.e., the remainder is not 0), we print "The number is odd".

When you run this program, it will prompt you to enter a number. After you provide the input, it will check if the number is even or odd and display the corresponding message.

Even Odd Program in Python Using Function

Code

# Python program with function to check if a number is even or odd

def check_even_odd(number):
    if number % 2 == 0:

        return "even"
    else:

        return "odd"

# Get input from the user
number = int(input("Enter a number: "))

# Call the function and print the result
result = check_even_odd(number)
print("The number is", result)

Output

Enter a number: 99
The number is odd

Explanation

Here, we have defined the check_even_odd function that takes a number as an argument. The function uses the modulo operator % to check if the number is divisible by 2. If the remainder of the division is 0, it means the number is even. Otherwise, it is odd.

The function returns the string "even" if the number is even, and "odd" if the number is odd.

We prompt the user to enter a number using the input() function, convert it to an integer using the int() function, and store it in the variable number.

We then call the check_even_odd function, passing in the number as an argument, and store the result in the variable result.

Finally, we print the result, indicating whether the number is even or odd.

Odd or Even Program in Python Using for loop

If you want to check multiple numbers and check if they are odd or even using a for loop in Python, you can use this program:

Code

# Using for loop to check even odd number

def check_even_odd(number):
    if number % 2 == 0:
        return "even"
    else:
        return "odd"

# Get input from the user
count = int(input("How many numbers do you want to check? "))

# Iterate for each number
for i in range(count):
    num = int(input("Enter number {}: ".format(i+1)))
    result = check_even_odd(num)
    print("Number {} is {}".format(num, result))

Output

How many numbers do you want to check? 5
Enter number 1: 9
Number 9 is odd
Enter number 2: 3
Number 3 is odd
Enter number 3: 0
Number 0 is even
Enter number 4: 11
Number 11 is odd
Enter number 5: 565
Number 565 is odd

Explanation

We definied the check_even_odd function. It takes a number as an argument and returns the string "even" if the number is even, or "odd" if it's odd.

Next, we prompt the user to enter the number of values they want to check using the input() function. The input is converted to an integer using the int() function and stored in the variable count.

We then use a for loop that iterates count number of times. Within each iteration, we prompt the user to enter a number and store it in the variable num.

We call the check_even_odd function, passing num as an argument, and store the result in the variable result.

Finally, we print the number entered and its corresponding result, indicating whether it is odd or even.

Odd or Even Program in Python Using while loop

Code

# Check multiple numbers, whether even or odd using while loop

def check_even_odd(number):
    if number % 2 == 0:
        return "even"
    else:
        return "odd"

# Get input from the user
count = int(input("How many numbers do you want to check? "))

# Initialize a counter
i = 0

# Iterate until counter reaches the count
while i < count:
    num = int(input("Enter number {}: ".format(i+1)))
    result = check_even_odd(num)
    print("Number {} is {}".format(num, result))
    i += 1

Output

How many numbers do you want to check? 6
Enter number 1: 82
Number 82 is even
Enter number 2: 44
Number 44 is even
Enter number 3: 26
Number 26 is even
Enter number 4: 7
Number 7 is odd
Enter number 5: 1
Number 1 is odd
Enter number 6: 9
Number 9 is odd

Explanation

We defined the check_even_odd function. It takes a number as an argument and returns the string "even" if the number is even, or "odd" if it's odd.

We then initialize a counter i to keep track of the number of iterations.

Using a while loop, we iterate until the counter i reaches the count value specified by the user. Within each iteration, we prompt the user to enter a number and store it in the variable num.

We call the check_even_odd function, passing num as an argument, and store the result in the variable result.

Finally, we print the number entered and its corresponding result, indicating whether it is odd or even.

Even Odd Program in Python Using List

Code

# Check if numbers in a list are even or odd

def check_even_odd(number):
    if number % 2 == 0:
        return "even"
    else:
        return "odd"

# Get input from the user
numbers = input("Enter a list of numbers separated by spaces: ").split()

# Convert the input into a list of integers
numbers = [int(num) for num in numbers]

# Check if each number is even or odd
for num in numbers:
    result = check_even_odd(num)
    print("Number {} is {}".format(num, result))

Output

Enter a list of numbers separated by spaces: 4 8 23 83 102 47
Number 4 is even
Number 8 is even
Number 23 is odd
Number 83 is odd
Number 102 is even
Number 47 is odd

Explanation

We define the check_even_odd function.

Next, we prompt the user to enter a list of numbers separated by spaces using the input() function. The input is split into individual numbers using the split() method, and the resulting list of numbers is stored in the variable numbers.

We then use a list comprehension to convert each number in the numbers list from a string to an integer.

Finally, we iterate over each number in the numbers list using a for loop. Within each iteration, we call the check_even_odd function to determine whether the number is odd or even, and print the corresponding result.

Even Odd Program in Python Using Lambda

Code

# Using lambda function to check even or odd number

# Get input from the user
numbers = input("Enter a list of numbers separated by spaces: ").split()

# Convert the input into a list of integers
numbers = [int(num) for num in numbers]

# Check if each number is even or odd using lambda function
results = list(map(lambda num: "even" if num % 2 == 0 else "odd", numbers))

# Print the results
for num, result in zip(numbers, results):
    print("Number {} is {}".format(num, result))

Output

Enter a list of numbers separated by spaces: 3 0 47 363 28 772
Number 3 is odd
Number 0 is even
Number 47 is odd
Number 363 is odd
Number 28 is even
Number 772 is even

Explanation

We start by prompting the user to enter a list of numbers separated by spaces using the input() function. The input is split into individual numbers using the split() method, and the resulting list of numbers is stored in the variable numbers.

We then use a list comprehension to convert each number in the numbers list from a string to an integer.

Next, we use the map() function with a lambda function to check if each number in the numbers list is even or odd. The lambda function takes a number as input and returns the string "even" if the number is divisible by 2, and "odd" otherwise. The results are stored in the results list.

Finally, we iterate over each number and result in parallel using the zip() function and print them.

Even Odd Program in Python Using Array

Code

# Using NumPy to find even odd using array

import numpy as np

def check_even_odd(number):
    if number % 2 == 0:
        return "even"
    else:
        return "odd"

# Get input from the user
numbers = input("Enter a list of numbers separated by spaces: ").split()

# Convert the input into a numpy array of integers
numbers = np.array([int(num) for num in numbers])

# Check if each number is even or odd using a vectorized lambda function
results = np.vectorize(lambda num: "even" if num % 2 == 0 else "odd")(numbers)

# Print the results
for num, result in zip(numbers, results):
    print("Number {} is {}".format(num, result))

Output

Enter a list of numbers separated by spaces: 2 77 29 22
Number 2 is even
Number 77 is odd
Number 29 is odd
Number 22 is even

Explanation

In this program, we start by importing the numpy library as np. It provides efficient array operations.

We prompt the user to enter a list of numbers separated by spaces using the input() function. The input is split into individual numbers using the split() method, and the resulting list of numbers is stored in the variable numbers.

We then use a list comprehension to convert each number in the numbers list from a string to an integer. The resulting list is converted into a numpy array using np.array().

Next, we define the check_even_odd function.

To check if each number in the numbers array is even or odd, we use a vectorized lambda function with np.vectorize(). The lambda function takes a number as input and returns the string "even" if the number is divisible by 2, and "odd" otherwise. The vectorized lambda function is applied to the numbers array, and the results are stored in the results array.

Finally, we iterate over each number and result in parallel using the zip() function and print them.

Odd Even Using Ternary Operator in Python

Code

# Get input from the user
number = int(input("Enter a number: "))

# Check if the number is odd or even using ternary operator
result = "even" if number % 2 == 0 else "odd"

# Print the result
print("The number is", result)

Output

Enter a number: 55
The number is odd

Explanation

We start by prompting the user to enter a number using the input() function. The input is converted to an integer using the int() function and stored in the variable number.

Next, we use the ternary operator to check if the number is even or odd. The condition number % 2 == 0 checks if the number is divisible by 2 (i.e., even). If the condition is true, the value "even" is assigned to the variable result; otherwise, the value "odd" is assigned.

Finally, we print the result, indicating whether the number is odd or even.

Even Odd Program in Python Without Using Modulus

Code

# Check if a number is odd or even without using the modulus operator

# Get input from the user
number = int(input("Enter a number: "))

# Check if the number is odd or even without using modulus
result = "even" if (number // 2) * 2 == number else "odd"

# Print the result
print("The number is", result)

Output

Enter a number: 66
The number is even

Explanation

We prompt the user to enter a number using the input() function. The input is converted to an integer using the int() function and stored in the variable number.

To check if the number is odd or even without using the modulus operator, we divide the number by 2 using the floor division operator // to get the integer division. We then multiply the result by 2 and compare it with the original number. If the two values are equal, it means the number is even; otherwise, it's odd.

We use the ternary operator to assign the appropriate result ("even" or "odd") to the variable result.

Finally, we print the result, indicating whether the number is odd or even.

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Examples

Even Odd Program in Python (How to Check Number is Even or Odd?)

Odd or Even Program in Python

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Explanation

Even Odd Program in Python Using Function

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Odd or Even Program in Python Using for loop

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Odd or Even Program in Python Using while loop

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Even Odd Program in Python Using List

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Even Odd Program in Python Using Lambda

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Even Odd Program in Python Using Array

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Odd Even Using Ternary Operator in Python

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Even Odd Program in Python Without Using Modulus

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Even Odd Program in Python: Video