#include <iostream>
using namespace std;


/* run this program using the console pauser or add your own getch, system("pause") or input loop */
struct Circle
{
	int radius;
	double girth;
	double area;	
}*cir1, *cir2 = new struct Circle;

int main(int argc, char** argv) {
	//1.宣告結構指標變數struct pointer，方法1：
	cir1 = new struct Circle;
	//指標結構變數宣告時，有個規矩：都必須要特別配置一塊記憶體位置給指標變數 
	//例如：一般指標變數： int * a1 = new int;
	//例如：結構指標變數：struct Circle * a1 = new struct Circle; 
	// new sturct Circle: (new)表示是配置一塊記憶體位置，其型別是(Circle的結構類） 
	cir1->radius = 2;
	cout<<"cir1的半徑 = "<<cir1->radius<<endl;
	
	//2.宣告結構指標變數struct pointer，方法2：
	cir2->radius = 3;
	cout<<"cir2的半徑 = "<<cir2->radius<<endl;
	 
	//3.宣告結構指標變數struct pointer，方法3：
	struct Circle * cir3 = new struct Circle;
	cir3->radius = 4;
	cout<<"cir3的半徑 = "<<cir3->radius<<endl;
	
	
	
	return 0;
}