The Simplest way to Check if Any Number is Even or Odd

In this Python example, we will discuss the ways to check if any given number is even or odd. Let’s begin.

1. What are Even or Odd numbers?

An even number is defined as a number that can be divided by two giving zero remainder or can be divided into two equal groups. On the other hand, an odd number is defined as a number that cannot be divided by two or cannot be divided into two equal groups

– Cuemath

Example:

Input :  4
Output : Even Number
Explanation : 4 % 2 is 0. Hence Even

Input : 9
Output : Odd Number
Explanation : 9 % 2 is not 0. Hence Odd

Some of the topics which will be helpful for understanding the program implementation better are:

• Operators in Python
• Python I/O
• If-Else in Python
• Recursion in Python
• Function in Python

Let’s find out, how can we find the number is even or odd using Python.

2. Check if Any Number is Even or Odd using Subtraction

• In this method, we will subtract the given number by number-2
• If we get the last number after subtraction as 0, then the number is even
• If we get the last number after subtraction as 1, then the number is odd

NOTE: This method cannot be applied to float numbers. The method can only work for integer numbers.

Let’s implement the code and see how it works.

# Python Program to Check is Number is even or odd using subtraction
def check(n):
  if n == 0:
    return True
  elif n == 1:
    return False
  else:
    return check(n-2)


num = int(input("Enter a integer number: "))
if check(num):
  print("Given number is even")
else:
  print("Given number is odd")

Output
Enter a integer number: 67
Given number is odd

In the above program, we have created a function check() which will take the number which the user will provide. Inside the function, the number will be checked with the conditions and when the number will be subtracted, it will be called using recursion technique.

3. Check if Any Number is Even or Odd using Modulus Operator

In this method, we take the help of the modulus operator to find the given number is even or odd. Modulo operator gives the remainder.

This is the preferred way to check whether a number is even or odd.

Let’s implement and find out the working of the code.

# Python Program to Check is Number is even or odd using Modulo
def check_odd_even(num):
  if num % 2 == 0:
    return "The Given Number is Even Number"
  else:
    return "The Given Number is Odd Number"


num = 3
print(check_odd_even(num))

Output
The Given Number is Odd Number

In the above program, we have made a function in which we have given the if…else… condition that if num % 2 == 0 then the given number is even. Else the given number is odd.

4. Conclusion

In this article, we have learned how can we check if any given number is even or odd. We have used two different techniques for the implementation, one using the subtraction method and other using the modulo operator method.

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Complete code samples are present on Github project.

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