關於「Tolower c」標籤，搜尋引擎有相關的訊息討論：

C tolower() - C Standard Library - Programizwww.programiz.com › library-function › ctype.h › tolowertolower - Hoogle - Haskell.orghoogle.haskell.org › hoogle=tolowerC Tutorial #40 - String toupper and tolower - YouTubewww.youtube.com › watchtolower ()-toupper ()-轉換字元大小寫 - IBMww