#include <iostream>

using namespace std;

class class1 {

	public:

	class1(){

	}

	class1(int i ){

	}

	void  show(){

		cout<<"this is output by class1 ! \n ";

	}

};

int main(){

	// static allocation :

	/*

	class1 oneclass();

	oneclass.show();

	error : request show() function of non-class oneclass .

	because : compile thinks of oneclass1 oneclass() as of function declaration with 

	name 'oneclass' and the return type class1 

	*/

/*

	class1 secondclass(1);

	secondclass.show();

*/

	//dynamic allocation :

	class1 * thirdclass = new class1();

	thirdclass->show();

	return 0;

}