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                ## perror ## 打印出錯誤原因信息字符串 ### 相關函數 ### strerror ### 表頭文件 ### ``` #include<stdio.h> ``` ### 定義函數 ### ``` void perror(const char *s); ``` ### 函數說明 ### perror()用來將上一個函數發生錯誤的原因輸出到標準錯誤(stderr)。參數s所指的字符串會先打印出,后面再加上錯誤原因字符串。此錯誤原因依照全局變量errno的值來決定要輸出的字符串。 ### 范例 ### ``` #include<stdio.h> main() { FILE *fp; fp = fopen(“/tmp/noexist”,”r+”); if(fp = =NULL) perror(“fopen”); } ``` ### 執行 ### ``` $ ./perror fopen : No such file or diretory ```
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