C++ quiz. How many times the destructor of the test class wi

How many times the destructor of the test class will be called in the following program?

#include <iostream>
using namespace std;
class test
{
public:
	test(int param)
	{
		i=param;
	}
	test(test &obj)
	{
		i=obj.i;
	}
	~test()
	{
		cout << "~test()" << endl;
	}
private:
	int i;
};
void func1(test obj)
{
	cout << "func1()" << endl;
}
void func2(test &obj)
{
	cout << "func2()" << endl;
}
int main()
{	
	test a(1);
	test b(2);
	test c(3);
	
	func1(a);
	func2(b);

	return 0;
}

Explanation

The destructor is called 4 times:
3 times for variables of type test a, b, c;
1 time after exiting the func1() function, because the variable a is passed by value, therefore the copy constructor creates a copy of the variable a, for which the destructor is automatically called when the function exits;
when the func2() function exits, the destructor is not called, because the variable is passed by reference, its copy is not created.

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