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                ## strstr ## 在一字符串中查找指定的字符串 ### 相關函數 ### index,memchr,rindex,strchr,strpbrk,strsep,strspn,strtok ### 表頭文件 ### ``` #include<string.h> ``` ### 定義函數 ### ``` char *strstr(const char *haystack, const char *needle); ``` ### 函數說明 ### strstr()會從字符串haystack 中搜尋字符串needle,并將第一次出現的地址返回。 ### 返回值 ### 返回指定字符串第一次出現的地址,否則返回0。 ### 范例 ### ``` #include<string.h> main() { char * s="012345678901234567890123456789"; char *p; p= strstr(s,"901"); printf("%s\n",p); } ``` ### 執行 ### ``` 9.01E+21 ```
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