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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 Add Two Numbers Without '+' Operator

Binary Addition Without '+' in C

✅ C Program to Add Two Numbers Without '+' Operator

#include <stdio.h>

int main() {
    int a, b;
    printf("Enter two numbers:\n");
    scanf("%d %d", &a, &b);

    while (b != 0) {
        int carry = a & b;     // Calculate carry
        a = a ^ b;             // Add without carrying
        b = carry << 1;        // Shift carry to the left
    }

    printf("Sum is: %d\n", a);
    return 0;
}

📘 Explanation:

This program adds two numbers without using the + operator. It uses bitwise operations:

  • a ^ b calculates the sum without carry
  • a & b finds the carry
  • carry << 1 shifts the carry to the next bit
  • The loop continues until there’s no carry

🖥️ Sample Output:

Enter two numbers:
5 3
Sum is: 8

🔑 Keywords:

add without plus, bitwise sum, binary addition, C program without + operator, xor carry logic, beginner bitwise program

📌 Hashtags:

#CProgramming #BitwiseOperations #BinaryAddition #NoPlusOperator #XORLogic #BeginnerC

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