Question

How to declare and use static member variables in C++

Answer 1

#include <iostream>

using namespace std;

class calc
{
	private:
		static int number;

	public:
		calc() { number++; }
		int getNumber() { return number; }
};

int calc::number = 0; // initialized explicitly

int main()
{
	calc a;
	calc b;
	calc c;

	cout << a.getNumber() << endl;
	cout << b.getNumber() << endl;
	cout << c.getNumber() << endl;

	return 0;
}


/*
run:

3
3
3

*/

 

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