环境搭建:
    macOS下使用VS Code配置gcc、gdb搭建C/C++开发环境 https://www.cnblogs.com/booturbo/p/17389050.html
    VScode C++环境配置 （MAC） https://zhuanlan.zhihu.com/p/486021900
    vsCode Mac版 配置C/C++，并运行代码 https://blog.csdn.net/qq_45956730/article/details/125874582
    Using Clang in Visual Studio Code https://code.visualstudio.com/docs/cpp/config-clang-mac

tasks.json (compiler build settings)
launch.json (debugger settings)
c_cpp_properties.json (compiler path and IntelliSense settings)


*  Executing task: C/C++: g++ 生成活动文件 
正在启动生成...
/usr/bin/g++ -fdiagnostics-color=always -g /Users/lijianquan/workspace/program-language/program-language-cpp/helloworld.cpp -o /Users/lijianquan/workspace/program-language/program-language-cpp/helloworld
生成已成功完成。
 *  Terminal will be reused by tasks, press any key to close it. 


问题列表
1 输出中文问题？无法输出中文
2 std::cin  >> num; 报错误: Unable to perform this action because the process is running.