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                ## strdup ## 復制字符串 ### 相關函數 ### calloc,malloc,realloc,free ### 表頭文件 ### ``` #include<string.h> ``` ### 定義函數 ### ``` char *strdup(const char *s); ``` ### 函數說明 ### strdup()會先用maolloc()配置與參數s字符串相同的空間大小,然后將參數s字符串的內容復制到該內存地址,然后把該地址返回。該地址最后可以利用free()來釋放。 ### 返回值 ### 返回一字符串指針,該指針指向復制后的新字符串地址。若返回NULL表示內存不足。 ### 范例 ### ``` #include<string.h> main() { char a[]="strdup"; char *b; b=strdup(a); printf("b[ ]=\"%s\"\n",b); } ``` ### 執行 ### ``` b[ ]="strdup" ```
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