C ++ 基本语法

#include<iostream>
using namespace std;
int main() {

    cout << "HelloWorld" << endl;
    system("pause");
}

    // 单行注释
    /*
      1.
      多行注释
      2....
     */
    int a = 10;

#include<iostream>
using namespace std;

#define DAY 7

int main() {
    
    cout << "一周有" << DAY << "天" <<endl;

    const int month = 12;

    cout << "一年有" << month << "月" << endl;

    system("pause");
}