Question

How to call base constructor from derived class in C++

Answer 1

#include <iostream>

using std::cout;
using std::endl;

class Base {
protected:
	int i;
public:
	Base(int _i) {
		i = _i;
		cout << "Base constructor" << endl;
	}
	~Base() {
		cout << "Base Destructor" << endl;
	}
};

class Derived : public Base {
	int j;
public:
	Derived(int _j, int _i) : Base(_i) {
		j = _j;
		cout << "Derived constructor" << endl;
	}

	~Derived() {
		cout << "Derived Destructor" << endl;
	}
	void print() {
		cout << i << " " << j << endl;
	}
};

int main()
{
	Derived o(87, 23);

	o.print();

	return 0;
}

/*
run:

Base constructor
Derived constructor
23 87
Derived Destructor
Base Destructor

*/

 

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