! [IMG] (https://img-mid.csdnimg.cn/release/static/image/mid/ask/445186359266114.jpg "# left") has just learned C language, but I don't know why, what is this situation?
https://blog.csdn.net/weixin_45872600/article/details/109763837
牛了 上面链接回答的很具体了
一看就是工具配置的问题，字符设置相关， 建议用vs这种大众常用以及问题较少的工具。