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                ## iscntrl ## 測試字符是否為ASCII 碼的控制字符 ### 相關函數 ### isascii ### 表頭文件 ### ``` #include <ctype.h> ``` ### 定義函數 ### ``` int iscntrl(int c); ``` ### 函數說明 ### 檢查參數c是否為ASCII控制碼,也就是判斷c的范圍是否在0到30之間。 ### 返回值 ### 若參數c為ASCII控制碼,則返回TRUE,否則返回NULL(0)。 ### 附加說明 ### 此為宏定義,非真正函數。
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