1.從類名要看出類的功能

2.類的花括號後不要忘了；號

#include <iostream>
#include <stdlib.h>

using namespace std;

class coordinate
{
public:
	int x;
	int y;
	void printxy()
	{
		cout << "(" << x << "," << y << ")" << endl;


	}


};


int main()
{
	cout << "從棧中例項化:" << endl;
	coordinate coor;  //從棧中例項化
	coor.x = 5;
	coor.y = 6;
	coor.printxy();



	cout << "從堆中例項化：" << endl;
	coordinate *p = new coordinate();
	if (NULL == p)
	{
		printf("new failure!");

	}                           //如果記憶體分配失敗，列印錯誤資訊
	
	p->x = 4;
	p->y = 5;
	p->printxy();

	delete p;                   //用完記得釋放記憶體
	p = NULL;

	system("pause");

}
 

執行結果：