输出字符雨，效果类似黑客帝国中的字符雨，若提示缺少graphics.h（Easyx）头文件，请到这里下载：www.easyx.cn -The output character rain, the effect is similar to the characters in the Matrix rain, suggest a lack of header files graphics.h (Easyx), please go to here to download: www.easyx.cn