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                ## tolower ## 將大寫字母轉換成小寫字母 ### 相關函數 ### isalpha,toupper ### 表頭文件 ### ``` #include<stdlib.h> ``` ### 定義函數 ### ``` int tolower(int c); ``` ### 函數說明 ### 若參數c為大寫字母則將該對應的小寫字母返回。 ### 返回值 ### 返回轉換后的小寫字母,若不須轉換則將參數c值返回。 ### 范例 ### ``` /* 將s字符串內的大寫字母轉換成小寫字母*/ #include<ctype.h> main() { char s[]=”aBcDeFgH12345;!#$”; int i; printf(“before tolower() : %s\n”,s); for(i=0;I<sizeof(s);i++) s[i]=tolower(s[i]); printf(“after tolower() : %s\n”,s); } ``` ### 執行 ### ``` before tolower() : aBcDeFgH12345;!#$ after tolower() : abcdefgh12345;!#$ ```
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