inharitance.cpp

//! ________________________________________inheritance___________________________________________________
//?reuseability
//?the deriving a new class from already present old class is call inheritance


#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

// class B { 
// public:
// int data_;
// B(int d) : data_(d) { 
//     cout << "B::B(int): " << data_ << endl; }
// ~B() { 
//     cout << "B::~B(): " << data_ << endl; }
// };
// class D: public B {
//  int info_;
// public:
// D(int d, int i) : B(d), info_(i) // ctor-1: Explicit construction of Base
// { 
//    cout << "D::D(int, int): " << data_ << ", " << info_ << endl; }

// D(int i) : info_(i) // ctor-2: Default construction of Base
// { 
//     cout << "D::D(int): " << data_ << ", " << info_ << endl; }

// ~D() { cout << "D::~D(): " << data_ << ", " << info_ << endl; }
// };
// int main()
// {
//    B b(5);

//    // ctor-1: Explicit construction of Base
//    D d1(1, 2);
 
  // ctor-2: Default construction of Base
  //If base class constructor do not have
    //default value  Error
   //D d2(3); 
// return 0;
// }
// class B {  
//     // output  5 0 0 2 0 2 0 5
// public:     
// int data_;
// B(int d = 0) : data_(d) { 
//     cout << "B::B(int): " << data_ << endl; }
// ~B() { 
//     cout << "B::~B(): " << data_ << endl; }
// };
// class D: public B {
//  int info_;
// public:
// D(int d, int i) 
// {
// //B(d); 
// info_= i ;
// cout << "D::D(int, int): " << data_ << ", " << info_ << endl; 
// }
// D(int i) : info_(i) // ctor-2: Default construction of Base
// { cout << "D::D(int): " << data_ << ", " << info_ << endl; }
// ~D() { cout << "D::~D(): " << data_ << ", " << info_ << endl; }
// };
// int main()
// {
//    B b(5);


//  D d1(1, 2);

// /* 
Now the code will work fine, the only issue is compiler will set data_ variable to 0 (default) rather setting it to 1 (user’s input)
*/

// return 0;
// }
// class Vehicle {
// protected:
//     int wheels_count;
//     float max_speed;
//     string manufacturer;

//     Vehicle(int, float, string);
//     void vehicle_print();
// };
// Vehicle::Vehicle(int wheels_count, float max_speed,
// 				string manufacturer):
// wheels_count(wheels_count),
// max_speed(max_speed),
// manufacturer(manufacturer) {
//     cout << "Vehicle constructor called\n";
// }
// void Vehicle::vehicle_print() {
//     cout << "Wheel Count: " << wheels_count << endl;
//     cout << "Max Speed: " << max_speed << endl;
//     cout << "Manufacturer: " << manufacturer << endl;
// }

// class Automobile : public Vehicle{
//     float engine_cc;
//     int gear_count;
// public:    
// Automobile(int wheels_count, float max_speed,
// 		  string manufacturer,
//                 float engine_cc, int gear_count):
//     engine_cc(engine_cc),
//     gear_count(gear_count),
//     Vehicle(wheels_count, max_speed, manufacturer) {
//         cout << "Automobile constructor called\n";
//     }
//     void print() {
//         vehicle_print();
//         cout << "Engine Capacity: " << engine_cc << endl;
//         cout << "Gear Count: " << gear_count << endl;
//     }
// };
// int main() {
//     Automobile automobile(2, 100, "Honda", 125, 4);
//     automobile.print();
//     return 0;
// }
class N{
    public:
    int i;
    N(){
        cout<<"N";
    }
    void n(){
        cout<<"n";
    }
};
class A: public N{
    public:
    int j;
     A(){
        cout<<"A";
    }
    void d(){
        cout<<"neha";
    }
};
class B :  public N {
    public :
    int k;
     B(){
        cout<<"B";
     }
    void w(){
        cout<<"helo";
    }
};
class C: public A,public B{

public:
int mul;
 C(){
        cout<<"C";
    }
void x(){

}

};
int main(){
    C c;
    B::c.i=10;
    c.j=20;
    c.k=30;
    c.mul=B::c.i*c.j*c.k;
    cout<
    // c x;
    // x.A;
    // x.B;
}