1、C語言中,有兩個log函數,分別為log10和log函數,具體用法如下:
2、函數名: log10
功 ?能: 對數函數log,以10為底
用 ?法: double log10(double x);
程序示例:
#include?<math.h>#include?<stdio.h>
int?main(void)
{
double?result; double?x?=?800.6872; result?=?log10(x); printf("The?common?log?of?%lf?is?%lf\n",?x,?result);? return?0;}
運行結果
3、函數名: log
功 ?能: 對數函數log,以e(2.71828)為底
用 ?法: double log(double x);
程序示例:
#include?<math.h>#include?<stdio.h>
int?main(void)
{
double?result; double?x?=?800.6872; result?=?log(x); printf("The?common?log?of?%lf?is?%lf\n",?x,?result);? return?0;}
運行結果