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                # C 庫宏 - ERANGE ## 描述 C 庫宏 **ERANGE** 表示一個范圍錯誤,它在輸入參數超出數學函數定義的范圍時發生,errno 被設置為 ERANGE。 ## 聲明 下面是 ERANGE 宏的聲明。 ``` #define ERANGE some_value ``` ## 參數 * **NA** ## 返回值 * **NA** ## 實例 下面的實例演示了 ERANGE 宏的用法。 ``` #include <stdio.h> #include <errno.h> #include <math.h> int main() { double x; double value; x = 1.000000; value = log(x); if( errno == ERANGE ) { printf("Log(%f) is out of range\n", x); } else { printf("Log(%f) = %f\n", x, value); } x = 0.000000; value = log(x); if( errno == ERANGE ) { printf("Log(%f) is out of range\n" x); } else { printf("Log(%f) = %f\n", x, value); } return 0; } ``` 讓我們編譯并運行上面的程序,這將產生以下結果: ``` Log(1.000000) = 1.609438 Log(0.000000) is out of range ```
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