BCA - OOPS and Data Structures

In C++, visibility modifiers control how class members (variables and functions) can be accessed from outside the class or from derived classes.

public - Anyone (inside & outside the class)
private - Only inside the class
protected - Inside the class and derived classes

Example :

#include <iostream>
using namespace std;

class MyClass {
public:
    int publicVar;  // Accessible anywhere

private:
    int privateVar; // Only accessible inside this class

protected:
    int protectedVar; // Accessible inside this class and child classes
};

int main() {
    MyClass obj;

    // Public variable - Allowed
    obj.publicVar = 10;
    cout << "Public Variable: " << obj.publicVar << endl;

    // Private variable - Not allowed (will give error if uncommented)
    // obj.privateVar = 20;

    // Protected variable - Not allowed (will also give error)
    // obj.protectedVar = 30;

    return 0;
}