C++ Primer Plus

第一章 初始C++

#include <iostream> //#:预处理

int main(void) //void:无参数
{
	using namespace std;

	int carrots; //定义声明语句:开辟内存空间， int:整型 

	cout << "how many corrots do you have?" << endl; //cout:输出流(out) endl:回车换行符
	cin >> carrots;
	cout << "here are two more.";
	carrots = carrots + 2;
	cout << "now you have " << carrots << " carrots" << endl;

	return 0; //标识符:程序成功运行
}

第二章 函数

2.1 使用有返回值的函数

#include <iostream>
#include <cmath>

int main()
{
	using namespace std;
	double area;
	cout << "输入面积：" << endl;
	cin >> area;
	double side;
	side = sqrt(area);
	cout << "输出边长：" << side << endl;

	return 0;
}

第三章 处理数据

一天学一章：20240427

#include <iostream>

int main()
{
	using namespace std;

	cout << "\aOperation \"Hyperhype\" is now activated:\n";
	cout << "Enter your agent code：________\b\b\b\b\b\b\b\b";

	long code;
	cin >> code;
	cout << "\ayou entered" << code << "...\n";

	return 0;
}