C Program: Print Binary Representation of a Number

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...

✅ C Program: Binary Representation of a Number

#include<stdio.h>
int main( )
{
    unsigned int num;
    printf("Enter the number:\n");
    scanf("%u", &num);

    for(int i = 31; i >= 0; i--)
    {
        if(num & (1 << i))
            printf("1");
        else
            printf("0");
    }
    printf("\n");
}

📘 Explanation:

This program prints the binary representation of an unsigned integer using bitwise operators.

The user inputs a number.
The loop checks all 32 bits (from MSB to LSB).
If the bit is set, it prints 1; otherwise, 0.
This uses the expression (num & (1 << i)) to test each bit.

🧾 Sample Output:

Enter the number:
5
00000000000000000000000000000101

🔖 Keywords:

C Program, Binary in C, Bitwise Operator in C, Binary Print, 32-bit Output, C Interview Questions, Unsigned Integer Handling

📌 Hashtags:

#CProgramming #BitwiseOperators #BinaryOutput #InterviewPreparation #AdSenseReady #CodingBlog

Search This Blog

1PRINTF

Featured

C Program to Check Prime Number Using Efficient Logic