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                ## isspace ## 測試字符是否為空格字符 ### 相關函數 ### isgraph ### 表頭文件 ### ``` #include<ctype.h> ``` ### 定義函數 ### ``` int isspace(int c) ``` ### 函數說明 ### 檢查參數c是否為空格字符,也就是判斷是否為空格('')、定位字符('\t')、CR('\r')、換行('\n')、垂直定位字符('\v')或翻頁('\f')的情況。 ### 返回值 ### 若參數c為空格字符,則返回TRUE,否則返回NULL(0)。 ### 附加說明 ### 此為宏定義,非真正函數。 ### 范例 ### ``` /*將字符串str[]中內含的空格字符找出,并顯示空格字符的ASCII碼*/ #include <ctype.h> main() { char str="123c @# FD\tsP[e?\n"; int i; for(i=0;str[i]!=0;i++) if(isspace(str[i])) printf("str[%d] is a white-space character:%d\n",i,str[i]); } ``` ### 執行 ### ``` str[4] is a white-space character:32 str[7] is a white-space character:32 str[10] is a white-space character:9 /* \t */ str[16] is a white-space character:10 /* \t */ ```
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