[C++知识库]c++类对象公有数据成员访问

#include<iostream>
using namespace std;
class CDate
{
public:
	int Date_Year;
	int Date_Month;
	int Date_Day;
};
int main()
{
	CDate date1;//定义CDate类对象date1、date2
	CDate date2;
	int age = 0;//定义年龄，初始值为0
	date1.Date_Year = 2019;//给date1的公有数据成员赋值
	date1.Date_Month = 3;
	date1.Date_Day = 9;
	date2.Date_Year = 1999;//給date2的公有数据成员赋值
	date2.Date_Month = 3;
	date2.Date_Day = 9;
	age = date1.Date_Year - date2.Date_Year;//计算年龄
	cout << "He is " << age << "years old." << endl;//输出生日
	cout << "His birthday is " 
		<< date2.Date_Year 
		<< '-' 
		<< date2.Date_Month
		<< '-' 
		<< date2.Date_Day 
		<< endl;
	cout << "date1 occupies " << sizeof(date1) << " bytes.";
	cout << endl;
	return 0;
}