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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 Find Remainder Without Using % Operator

C Program to Find Remainder Without Using % Operator

✅ C Program to Find Remainder Without Using % Operator

#include <stdio.h>
int main() {
    int a, b;
    printf("Enter two numbers (a %% b): ");
    scanf("%d %d", &a, &b);

    int sign = 1;
    if (a < 0) { a = -a; sign = -sign; } // handle negative dividend
    if (b < 0) { b = -b; }               // divisor just made positive

    while (a >= b) {
        a -= b;   // keep subtracting divisor from dividend
    }

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

📘 Explanation:

This program calculates the remainder without using the modulus (%) operator. It repeatedly subtracts the divisor from the dividend until the remainder is smaller than the divisor.

  • Handles negative dividends by tracking the sign.
  • a -= b; keeps subtracting divisor until remainder is less.
  • Final result is adjusted using sign * a.

🧾 Sample Output:

Enter two numbers (a % b): 17 5
Remainder is: 2

Enter two numbers (a % b): -17 5
Remainder is: -2

🔑 Keywords:

C program remainder without %, modulus without operator, remainder using subtraction, arithmetic operators in C, tricky C programs

📌 Hashtags:

#CProgramming #Modulo #InterviewPrep #LearnC #BitwiseTricks

🔍 Search Description:

Learn how to find remainder in C without using modulus (%) operator. Uses repeated subtraction and handles negative numbers. Includes explanation and sample output.

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