Check Even or Odd using Bitwise AND in C

January 03, 2026

C Program to Check Prime Number Using Efficient Logic

Introduction A prime number is a number that has exactly two distinct positive divisors: 1 and itself. In this program, we check whether a given number is prime or not using a simple and efficient logic. This type of program is commonly used in mathematics, competitive programming, and basic algorithm learning for beginners in C programming. Problem Statement The task is to write a C program that determines whether a given integer is a prime number or not. The program takes a single integer input from the user and analyzes its divisibility. If the number has no divisors other than 1 and itself, it should be identified as a prime number; otherwise, it is not prime. This problem is important in number theory and has practical relevance in areas such as cryptography, data validation, and algorithm design. Algorithm / Logic Explanation To check whether a number is prime, we need to verify that it is not divisible by any number other than 1 and itself. The algorithm follows a si...

✅ Check Even or Odd Using Bitwise AND in C

#include <stdio.h>

int main() {
    int num;
    printf("Enter a number:\n");
    scanf("%d", &num);

    // Using bitwise AND operator
    if (num & 1)
        printf("%d is Odd\n", num);
    else
        printf("%d is Even\n", num);

    return 0;
}

📘 Explanation:

This C program determines whether a number is even or odd using the bitwise AND operator:

In binary, even numbers end with 0 and odd numbers end with 1.
num & 1 isolates the last bit of the number.
If the result is 1, the number is odd. If it's 0, it's even.

This method is efficient and used in low-level systems and embedded code for performance.

🧾 Sample Output:

Enter a number:
11
11 is Odd

Enter a number:
24
24 is Even

🔑 Keywords:

Bitwise AND, Even or Odd using bitwise, C program for parity check, binary logic, bitwise operators, embedded C tricks

📌 Hashtags:

#CProgramming #BitwiseOperations #EvenOddCheck #BinaryLogic #BeginnerC #EmbeddedC #CodingTricks

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C Program to Check Prime Number Using Efficient Logic