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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...
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C Program to Convert Hexadecimal to Binary

C Program to Convert Hexadecimal to Binary

✅ C Program to Convert Hexadecimal to Binary (Using Bitwise Operators)

#include <stdio.h>
int main() {
    int num;
    printf("Enter a hexadecimal number: ");
    scanf("%x", &num);   // read hex directly into int

    printf("Binary: ");
    for (int i = 31; i >= 0; i--) {
        int bit = (num >> i) & 1;
        printf("%d", bit);
    }
    printf("\n");
    return 0;
}

📘 Explanation:

This program converts a hexadecimal number into its binary form using bitwise operators.

  • scanf("%x", &num) → directly reads a hexadecimal number into an integer.
  • (num >> i) & 1 → extracts the i-th bit from the number.
  • Loop runs from bit 31 to 0 → prints all 32 bits (full binary representation).
  • Output shows the binary form padded to 32 bits.

🧾 Sample Output:

Enter a hexadecimal number: 1A
Binary: 00000000000000000000000000011010

Enter a hexadecimal number: FF
Binary: 00000000000000000000000011111111

🔑 Keywords:

C program hex to binary, hexadecimal to binary conversion, bitwise operators in C, scanf %x example, binary representation in C

📌 Hashtags:

#CProgramming #HexToBinary #BitwiseOperators #CodingForBeginners #InterviewQuestions

🔍 Search Description:

This C program converts hexadecimal to binary using bitwise operators. It reads hex with %x and prints the 32-bit binary representation.

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