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                # C 庫函數 - log10() ## 描述 C 庫函數 **double log10(double x)** 返回 **x** 的常用對數(基數為 10 的對數)。 ## 聲明 下面是 log10() 函數的聲明。 ``` double log10(double x) ``` ## 參數 * **x** -- 浮點值。 ## 返回值 該函數返回 x 的常用對數,x 的值大于 0。 ## 實例 下面的實例演示了 log10() 函數的用法。 ``` #include <stdio.h> #include <math.h> int main () { double x, ret; x = 10000; /* 計算 log10(10000) */ ret = log10(x); printf("log10(%lf) = %lf\n", x, ret); return(0); } ``` 讓我們編譯并運行上面的程序,這將產生以下結果: ``` log10(10000.000000) = 4.000000 ```
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