#include <iostream>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
//目的：練習：指標的指標 ，void的指標 ，指標的陣列 
//(1).注意1：陣列名稱就是記憶體位址變數 = 指標
//int a1[];      a1 = *a1 
int main(int argc, char** argv) 
{
//1. 指標的指標
	//a 是指標的指標
	int ** a;
	//b 是指標 
	int * b = new int;
	*b = 50;
	//a 是指標b的指標
	a = &b;
	
	cout<<"1. 指標的指標 ："<<endl;
	cout<<"a = "<<a<<endl;
	cout<<"*a = "<<*a<<endl;
	cout<<"**a = "<<**a<<endl;
	cout<<"b = "<<b<<endl;
	cout<<"*b = "<<*b<<endl;
	cout<<endl;
	
//2. void的指標
	//void 是通用型別，無型別 
	//用途：void無型別的指標，可以先儲存任意型別的指標，但若要取出其儲存值，較麻煩
	int * c = new int;
	*c = 20;
	void * d;
	d = c;
	cout<<"2. void的指標 ："<<endl;
	cout<<"c = "<<c<<endl;
	cout<<"d = "<<d<<endl;
	cout<<"*c = "<<*c<<endl;
	cout<<"*d = 會出現錯誤"<<endl;	 
	cout<<"*(int*)d = "<<*(int*)d<<endl;
	cout<<endl;
	
//3. 指標的陣列
	int * e[3];
	//每一個陣列元素，要先初始化，配置一個記憶體空間給它 
	e[0] = new int;
	*e[0] = 10;
	e[1] = new int;
	*e[1] = 20; 
	e[2] = new int;
 	*e[2] = 30;
 	cout<<"3. 指標的陣列 ："<<endl;
	cout<<"e[0] = "<<e[0]<<endl;
	cout<<"*e[0] = "<<*e[0]<<endl;
	cout<<"e[1] = "<<e[1]<<endl;
	cout<<"*e[1] = "<<*e[1]<<endl; 	
 	
	return 0;
}