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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 for Referencing and Dereferencing (Pointers)

C Program for Referencing and Dereferencing (Pointers)

✅ C Program for Referencing and Dereferencing (Pointers)

#include<stdio.h>
int main()
{
    int x = 10;
    int *ptr = &x;   // Referencing = storing the address of variable 'x' into pointer 'ptr'.

    printf("%d", *ptr);  // Dereferencing = fetching the value stored at that address (here 10).
}

📘 Explanation:

Pointers in C are used to store the address of variables. - Referencing (&): The & operator is used to get the address of a variable. - Dereferencing (*): The * operator is used to fetch the value stored at that address.

In this program:

  • int *ptr = &x; → stores the address of x into pointer ptr.
  • *ptr → retrieves the value stored at that address (10).

🧾 Sample Output:

10

🔑 Keywords:

C pointers, referencing in C, dereferencing in C, pointer basics, beginner C programs, C interview questions on pointers

📌 Hashtags:

#CProgramming #Pointers #Referencing #Dereferencing #InterviewPrep

🔍 Search Description:

Simple C program to demonstrate referencing (&) and dereferencing (*) using pointers. Explains storing an address and accessing value with sample output.

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