How do you print if a number is odd or even in python?

Question

A number is even if it is perfectly divisible by 2. When the number is divided by 2, we use the remainder operator % to compute the remainder. If the remainder is not zero, the number is odd.

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Source Code
Python Program to Check if a Number is Odd or Even
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Python Basic: Exercise-21 with Solution
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Python: Tips of the Day
Using Bitwise AND operator
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Source Code

# Python program to check if the input number is odd or even.
# A number is even if division by 2 gives a remainder of 0.
# If the remainder is 1, it is an odd number.

num = int(input("Enter a number: "))
if (num % 2) == 0:
   print("{0} is Even".format(num))
else:
   print("{0} is Odd".format(num))

Output 1

Enter a number: 43
43 is Odd

Output 2

Enter a number: 18
18 is Even

In this program, we ask the user for the input and check if the number is odd or even. Please note that { } is a replacement field for num.

Python Program to Check if a Number is Odd or Even

Odd and Even numbers:

If you divide a number by 2 and it gives a remainder of 0 then it is known as even number, otherwise an odd number.

Even number examples: 2, 4, 6, 8, 10, etc.

Odd number examples:1, 3, 5, 7, 9 etc.

See this example:

Output:

How do you print if a number is odd or even in python?

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Last update on August 19 2022 21:51:46 (UTC/GMT +8 hours)

Python Basic: Exercise-21 with Solution

Write a Python program to find whether a given number (accept from the user) is even or odd, print out an appropriate message to the user.

Pictorial Presentation of Even Numbers:

Pictorial Presentation of Odd Numbers:

Sample Solution:-

Python Code:

num = int(input("Enter a number: "))
mod = num % 2
if mod > 0:
    print("This is an odd number.")
else:
    print("This is an even number.")

Sample Output:

Enter a number: 5                                                                                             
This is an odd number.

Even Numbers between 1 to 100:

Odd Numbers between 1 to 100:

Flowchart:

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The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor:

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Python: Tips of the Day

Convert a dict to XML:

from xml.etree.ElementTree import Elementdef dict_to_xml(tag, d):
    '''
    Turn a simple dict of key/value pairs into XML
    '''
    elem = Element(tag)
    for key, val in d.items():
        child = Element(key)
        child.text = str(val)
        elem.append(child)
    return elem

I'm trying to make a program which checks if a word is a palindrome and I've gotten so far and it works with words that have an even amount of numbers. I know how to make it do something if the amount of letters is odd but I just don't know how to find out if a number is odd. Is there any simple way to find if a number is odd or even?

Just for reference, this is my code:

a = 0

while a == 0:
    print("\n \n" * 100)
    print("Please enter a word to check if it is a palindrome: ")
    word = input("?: ")

    wordLength = int(len(word))
    finalWordLength = int(wordLength / 2)
    firstHalf = word[:finalWordLength]
    secondHalf = word[finalWordLength + 1:]
    secondHalf = secondHalf[::-1]
    print(firstHalf)
    print(secondHalf)

    if firstHalf == secondHalf:
        print("This is a palindrom")
    else:
        print("This is not a palindrom")


    print("Press enter to restart")
    input()

mkrieger1

15.6k4 gold badges45 silver badges57 bronze badges

asked Feb 17, 2014 at 19:03

1

if num % 2 == 0:
    pass # Even 
else:
    pass # Odd

The % sign is like division only it checks for the remainder, so if the number divided by 2 has a remainder of 0 it's even otherwise odd.

Or reverse them for a little speed improvement, since any number above 0 is also considered "True" you can skip needing to do any equality check:

if num % 2:
    pass # Odd
else:
    pass # Even

answered Feb 17, 2014 at 19:05

DeadChexDeadChex

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5

Similarly to other languages, the fastest "modulo 2" (odd/even) operation is done using the bitwise and operator:

if x & 1:
    return 'odd'
else:
    return 'even'

Using Bitwise AND operator

The idea is to check whether the last bit of the number is set or not. If last bit is set then the number is odd, otherwise even.
If a number is odd & (bitwise AND) of the Number by 1 will be 1, because the last bit would already be set. Otherwise it will give 0 as output.

answered Feb 17, 2014 at 19:07

lejlotlejlot

62.7k8 gold badges128 silver badges158 bronze badges

6

It shouldn't matter if the word has an even or odd amount fo letters:

def is_palindrome(word):
    if word == word[::-1]:
        return True
    else:
        return False

answered Feb 17, 2014 at 19:05

kylieCattkylieCatt

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3

One of the simplest ways is to use de modulus operator %. If n % 2 == 0, then your number is even.

Hope it helps,

answered Feb 17, 2014 at 19:05

Esteban AlivertiEsteban Aliverti

6,0792 gold badges18 silver badges31 bronze badges

Use the modulo operator:

if wordLength % 2 == 0:
    print "wordLength is even"
else:
    print "wordLength is odd"

For your problem, the simplest is to check if the word is equal to its reversed brother. You can do that with word[::-1], which create the list from word by taking every character from the end to the start:

def is_palindrome(word):
    return word == word[::-1]

answered Feb 17, 2014 at 19:05

Maxime LorantMaxime Lorant

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0

The middle letter of an odd-length word is irrelevant in determining whether the word is a palindrome. Just ignore it.

Hint: all you need is a slight tweak to the following line to make this work for all word lengths:

secondHalf = word[finalWordLength + 1:]

P.S. If you insist on handling the two cases separately, if len(word) % 2: ... would tell you that the word has an odd number of characters.

answered Feb 17, 2014 at 19:05

NPENPE

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Not the answer you're looking for? Browse other questions tagged python or ask your own question.

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How do you print if a number is odd or even in python?

Source Code

Python Program to Check if a Number is Odd or Even

Feedback

Help Others, Please Share

Python Basic: Exercise-21 with Solution

Visualize Python code execution:

Python: Tips of the Day

Using Bitwise AND operator

Not the answer you're looking for? Browse other questions tagged python or ask your own question.

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