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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 Example on Virtual Function and Runtime Polymorphism

C++ Program Example on Virtual Function and Runtime Polymorphism

✅ C++ Program to Demonstrate Virtual Function and Runtime Polymorphism

#include <iostream>
using namespace std;

class Base {
public:
    // Virtual function
    virtual void display() {
        cout << "Display from Base class\n";
    }
};

class Derived : public Base {
public:
    void display() {
        cout << "Display from Derived class\n";
    }
};

int main() {
    Base *ptr;      // Base class pointer
    Derived obj;    // Derived class object
    ptr = &obj;

    // Because 'display' is virtual, Derived version is called
    ptr->display(); 

    return 0;
}

📘 Explanation:

This program demonstrates runtime polymorphism in C++ using a virtual function.

  • display() is declared as virtual inside the Base class.
  • The Derived class overrides the display() function.
  • A Base class pointer is used to call display() on a Derived object.
  • Because of dynamic binding, the Derived version executes at runtime.

🧾 Sample Output:

Display from Derived class

🔑 Keywords:

C++ virtual function example, runtime polymorphism, OOPs in C++, base and derived class example, dynamic binding

📌 Hashtags:

#CPlusPlus #OOPs #VirtualFunction #RuntimePolymorphism #Programming

🔍 Search Description:

Learn how virtual functions enable runtime polymorphism in C++. This example demonstrates how a base class pointer can call a derived class function using the virtual keyword.

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