#include <iostream>
using namespace std;
 
int main() {
 
	int x = 10;
	int* ptr; // 宣告
	ptr = &x; // address-of operator; 取址運算子
 
	cout << "x = " << x << endl;
	cout << "&x = " << &x << endl;
	cout << "ptr = " << ptr << endl;
	cout << "&ptr = " << &ptr << endl;
 
	cout << "*ptr = " << *ptr << endl; // content-of operator;
	                                   // 取值運算子
	*ptr = *ptr + 1;
	cout << "x = " << x << endl;
 
	return 0;
}

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