Boolan memory test, C++ (gcc)

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#include <iostream>
using std::cout;
using std::endl;

class Fruit {
public:
	int no;
	double weight;
	char key;

void print() {   }
	virtual void process() {   }
};

class Apple : public Fruit {
public:
	int size;
	char type;

void save() {   }
	virtual void process() {   }
};

int main(int argc, char* argv[]) {
	Fruit fruit;
	Apple apple;

cout << "--------Fruit--------" << endl;
	cout << "sizeof(Fruit)=" << sizeof(Fruit) << endl;
	cout << "Fruit.vptr  =" << &fruit << endl;
	cout << "Fruit.no    =" << &fruit.no << endl;
	cout << "Fruit.weight=" << &fruit.weight << endl;
	/*
	C++中字符型指针会被当做字符串处理，&fruit.key会输出指针所指的字符串，
	因此需要使用static_cast将字符指针转换成无类型指针
	*/
	cout << "Fruit.key   =" << static_cast<const void *> (&fruit.key) << endl;
	cout << "--------Apple--------" << endl;
	cout << "sizeof(Apple)=" << sizeof(Apple) << endl;
	cout << "Apple.vptr  =" << &apple << endl;
	cout << "Apple.no    =" << &apple.no << endl;
	cout << "Apple.weight=" << &apple.weight << endl;
	cout << "Apple.key   =" << static_cast<const void *> (&apple.key) << endl;
	cout << "Apple.size  =" << &apple.size << endl;
	cout << "Apple.type  =" << static_cast<const void *> (&apple.type) << endl;

return 0; 
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 0.32 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,47 sec