Write a C function to check if a given integer is odd or even using bitwise operators.

To determine if a given integer is odd or even we should check its least significant bit (LSB). If least significant bit of an integer is 1, it will be an odd number else it would be even. We can use bitwise AND (&) operator for checking if a given integer is odd or even. When bitwise AND is performed on an integer and 1 then result will be 1 if the integer is odd, else the result will be zero. Following program develops a small C function isOdd that receives an integer as input and return zero or one depending upon the inputted number is even or odd.

C program to check if a given integer is odd or even using bitwise operators.

/* Write a C program to check if a given 
   integer is odd or even using bitwise operators. 
 */
 
#include <stdio.h>
#include <string.h>
 
int isOdd (int n)
{
  if (n & 1)
    return 1;
  else
    return 0;
}
 
int main(void)
{
  unsigned int n;
  printf("Enter a positive integer: ");
  scanf("%u", &n);
  if (isOdd(n))
    printf("%d is odd", n);
  else
    printf("%d is even", n);
}
 
OUTPUT
======
Enter a positive integer: 11
11 is odd
 

Hope you have enjoyed reading C program that checks if a given integer is odd or even using bitwise operators. Please do write us if you have any suggestion/comment or come across any error on this page. Thanks for reading!




Get Free Tutorials by Email

About the Author

is the main author for cs-fundamentals.com. He is a software professional (post graduated from BITS-Pilani) and loves writing technical articles on programming and data structures.

Today's Tech News

Amazon resists Echo murder evidence callPosted on Thursday February 23, 2017

Amazon issues formal legal response to requests to hand over information from its smart speaker Echo.

Router hacker suspect arrested at Luton AirportPosted on Thursday February 23, 2017

The "mastermind" behind a massive 2016 attack may face sabotage charges in Germany.

A guided tour of the cybercrime undergroundPosted on Wednesday February 22, 2017

Malware researcher Anton talks about who does what in the web's dark marketplaces.

Courtesy BBC News