#include <iostream>

class classA {
	public:
		void classAprint() {
			using namespace std;
			cout << "classA print" << endl;
		}
};

class classB {
	public:
		void classBprint() {
			myclassA.classAprint(); // why don't this work?
		}
};

int main () {
	classA myclassA;
	classB myclassB;
	myclassA.classAprint(); // this work.
	myclassB.classBprint(); // why don't this work?
	return 0;
}