Cpp-learning/Hello World/Mian1.cpp

#include <iostream>

//常量的定义方式
//1、#define  宏常量
//2、const 修饰的变量

//1、#define  宏常量
#define Day 7


int main1()
{
	
	std::cout << "Hello World" << std::endl;

	                                                                             //变量创建的语法：数据类型  变量名  =  变量初始值
	int a = 10;

	std::cout << "a = " << a << std::endl;
	
	
	//Day = 14;                                                                  //错误，Day是常量，一旦修改就会报错
	std::cout << "一周总共有：" << Day << "天" << std::endl;
	
	//2、const修饰的变量
	const int month = 12;
	//month = 24;                                                                //错误，const修饰的变量也称为常量
	
	std::cout << "一年总共有：" << month << "个月份" << std::endl;

	system("pause");

	return 0;
}