<iomanip>ポータル:https://baike.baidu.com/item/iomanip/3319954?fr=aladdin
:Linuxはなぜプログラム実行に./使用https://blog.csdn.net/lijinshanba/article/details/81985961を
snprintfの使用:https://baike.baidu.com/item/snprintf%28%29/708910?fromtitle=snprintf&fromid=7320492&fr=aladdin