#include <iostream>
#include <string>
using namespace std;

int main() {
    cout << "Hello, C++! 🚀" << endl;
    cout << "欢迎来到 C++ 编程世界！" << endl;
    cout << endl;

    // 输入示例
    string name;
    cout << "请输入你的名字：";
    getline(cin, name);
    cout << "你好，" << name << "！" << endl;

    // 循环示例
    cout << endl << "=== 循环示例 ===" << endl;
    for (int i = 1; i <= 5; i++) {
        cout << "第 " << i << " 次循环" << endl;
    }

    // 计算示例
    cout << endl << "=== 计算示例 ===" << endl;
    int a = 10, b = 20;
    cout << a << " + " << b << " = " << (a + b) << endl;
    cout << a << " * " << b << " = " << (a * b) << endl;

    return 0;
}