在Windows上，当您包括 SDL.h ， main 被重新定义为 SDL_main 调用 WinMain （非控制台Windows应用程序的真正入口点），做一些初始化，最后调用你的主要代码。它有一个签名 argc 和 argv ，你几乎需要遵循它，所以 int main（）将无法工作。

This is SDL thing. On Windows, when you include SDL.h,main is redefined to SDL_main which calls WinMain (the real entry point in non-console Windows apps), does some initialization and finally calls your main code. It has a signature with argc and argv and you're pretty much required to follow it, so int main() won't work.