Binary to Decimal Conversion 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...

✅ Binary to Decimal Conversion in C

#include<stdio.h>
int main( )
{
    int num, decimal = 0, remainder, j = 1;
    printf("Enter binary number:\n");
    scanf("%d", &num);
    while(num != 0)
    {
        remainder = num % 10;
        decimal = decimal + remainder * j;
        j = j * 2;
        num = num / 10;
    }
    printf("The decimal value is %d\n", decimal);
}

📘 Explanation:

This program converts a binary number (input as an integer) into its decimal equivalent.
- It extracts each digit (right to left) using modulus and multiplies it by powers of 2.
- The value is added to a `decimal` variable.
- `%d` is used in printf to display the result in decimal format.

🧾 Sample Output:

Enter binary number:
1010
The decimal value is 10

🔑 Keywords:

Binary to Decimal, C Program for Number Conversion, Beginner C Code, scanf printf usage, while loop example, base-2 to base-10

📌 Hashtags:

#CProgramming #BinaryToDecimal #BeginnerCode #NumberConversion #whileLoop #scanf #printf #LogicInC

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C Program to Check Prime Number Using Efficient Logic