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                ## strcspn ## 返回字符串中連續不含指定字符串內容的字符數 ### 相關函數 ### strspn ### 表頭文件 ### ``` #inclued<string.h> ``` ### 定義函數 ### ``` size_t strcspn(const char *s, const char *reject); ``` ### 函數說明 ### strcspn()從參數s字符串的開頭計算連續的字符,而這些字符都完全不在參數reject 所指的字符串中。簡單地說,若strcspn()返回的數值為n,則代表字符串s開頭連續有n個字符都不含字符串reject內的字符。 ### 返回值 ### 返回字符串s開頭連續不含字符串reject內的字符數目。 ### 范例 ### ``` #include <string.h> main() { char *str="Linux was first developed for 386/486-based pcs."; printf("%d\n",strcspn(str," ")); printf("%d\n",strcspn(str,"/-")); printf("%d\n",strcspn(str,"1234567890")); } ``` ### 執行 ### ``` 5 /*只計算到“ ”的出現,所以返回“Linux”的長度*/ 33 /*計算到出現“/”或“-”,所以返回到“6”的長度*/ 30 /* 計算到出現數字字符為止,所以返回“3”出現前的長度*/ ```
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