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設計一個程式讓使用者可輸入一個字元(使用 getchar() 函式),並且判斷使用者輸入的字元是否為英文字母大小寫,如果是大寫就轉成小寫輸出,小寫則轉成大寫輸出,不是英文字母則提醒使用者輸入錯誤。

 

參考書籍:旗標無痛學習教本
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