1、C語言中,有兩個log函數(shù),分別為log10和log函數(shù),具體用法如下:2、函數(shù)名:log10功能:對數(shù)函數(shù)log,以10為底用法:doublelog10(doublex);程序示例:include<math.h>#include<stdio.h>intmain(vo...
C語言中直接提供的是e為底的自然對數(shù)log,和以10為底的常用對數(shù)log10,其他對數(shù)寫個函內(nèi)數(shù)就可以。include<stdio.h>include<math.h>doubleloga(doublen,doublebase);intmain(void){doublea,b,c;a...
voidmain(){floatx=5,y;y=log(x);printf("%f\n",y);}
i=2,j=4;\x0d\x0aprintf("log2,4=%f\n",log(j)/log(i));\x0d\x0a}\x0d\x0a\x0d\x0a//log函數(shù)是以e為底的,還有一個log10以10為底,可以利用logi,j=loge,j/loge,i來算。
首先在C語言中要用到指數(shù)、對數(shù)的相關(guān)公式,需要引入math.h。另外ln是以e為底數(shù),lg是以10為底數(shù)。代碼如下:include<stdio.h>include<math.h>voidmain(){doubleexponent,base;exponent=3.14;printf("ln(...
1,getchar()函數(shù)getchar函數(shù)的作用是等待用戶的輸入并讀取字符的數(shù)值并顯示相應(yīng)的字符到屏幕上,在用戶輸入回車鍵以后才返回相應(yīng)的第一個輸入字符的數(shù)值到調(diào)用函數(shù),函數(shù)原型的聲明如下:intgetchar(void)。2,getch()...
x的自然對數(shù)用log(x)表示常用對數(shù)用log10(x)表示include<stdio.h>include<math.h>intmain(){inti;for(i=1;i<=10;i++)printf("log10(%d)=%lf\n",i,log10(i));return0;}...
求lnx為log(x)求log10x是log10(x)沒有專門的求任意底數(shù)對數(shù)的函數(shù),不過可以用log(x)/log(y)表示logyx
c里直接提供的是以e為底的自然對數(shù)log,和以10為底的常用對數(shù)log10其他對數(shù)寫個函數(shù)就可以include<stdio.h>include<math.h>doubleloga(doublen,doublebase);intmain(void){doublea,...
include"math.h"doublea=log(x);//e為底doubleb=log10(double);//10為底把數(shù)組各個元素的值都設(shè)成正的lg不可能對負(fù)數(shù)求值。而a【】默認(rèn)是負(fù)數(shù)///關(guān)于樓主的疑問log(x),x必須大于0include"math.h"...