㏒1/2=-㏒2怎么变得型

来源：蜘蛛抓取(WebSpider) 时间：2017-07-24 07:33 标签： 47路
；（2）log2(1+2&+3)+log2(1+2-3)=．
科目：高中数学
题型：解答题
计算（1）lg20-lg2-log23•log32+2log（2）（-1）0+（）+（）．
科目：高中数学
计算:(1)log2(8b·16a)；(2)log8+2log.
精英家教网新版app上线啦！用app只需扫描书本条形码就能找到作业，家长给孩子检查作业更省心，同学们作业对答案更方便，扫描上方二维码立刻安装！
请输入姓名
请输入手机号c - log2 not found in my math.h? - Stack Overflow
Learn, Share, Build
Each month, over 50 million developers come to Stack Overflow to learn, share their knowledge, and build their careers.
Join the world’s largest developer community.
Display name
Email address
By registering, you agree to the
I'm using a fairly new install of Visual C++ 2008 Express.
I'm trying to compile a program that uses the log2 function, which was found by including
using Eclipse on a Mac, but this Windows computer can't find the function (error C3861: 'log2': identifier not found).
The way I understood it, include directories are specific to the IDE, right? math.h is not present in my Microsoft SDKs\Windows\v6.0A\Include\ directory, but I did find a math.h in this directory: Microsoft Visual Studio 9.0\VC\include. There is also a cmath in that directory...
Where is log2?
4,662175690
Prototype: double log2(double anumber);
Header File: math.h (C) or cmath (C++)
Alternatively emulate it like
#include &math.h&
// Calculates log2 of number.
double Log2( double n )
// log(n)/log(2) is log2.
return log( n ) / log( 2 );
Unfortunately Microsoft .
15.8k43555
If you're trying to find the log2 of strictly integers, some bitwise can't hurt:
#include &stdio.h&
unsigned int log2( unsigned int x )
unsigned int ans = 0 ;
while( x&&=1 ) ans++;
int main()
// log(7) = 2 here, log(8)=3.
//for( int i = 0 ; i & 32 ; i++ )
printf( "log_2( %d ) = %d\n", i, log2( i ) ) ;
for( unsigned int i = 1 ; i &= (1&&30) ; i &&= 1 )
printf( "log_2( %d ) = %d\n", i, log2( i ) ) ;
31.5k39200279
log2() is only defined in the C99 standard, not the C90 standard.
Microsoft Visual C++ is not fully C99 compliant (heck, there isn't a single fully C99 compliant compiler in existence, I believe -- not even GCC fully supports it), so it's not required to provide log2().
274k70416518
With Visual Studio 2013, log2() was added. See .
12.6k74171
Your Answer
Sign up or
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Post as a guest
By posting your answer, you agree to the
Not the answer you're looking for?
Browse other questions tagged
Stack Overflow works best with JavaScript enabled((1-log63)2+log62*log618)/log64=?
提问：级别：四年级来自：天星教育网
回答数：1浏览数：
((1-log63)2+log62*log618)/log64=?
((1-log63)2+log62*log618)/log64=?《错，1，下》
&提问时间： 13:31:21
最佳答案此答案已被选择为最佳答案，但并不代表问吧支持或赞同其观点
回答：级别：专业试用 16:10:51来自：河南省
提问者对答案的评价：
大恩不言谢
总回答数1，每页15条，当前第1页，共1页
同类疑难问题
最新热点问题【图文】高一数学2.2.1-4对数_百度文库
两大类热门资源免费畅读
续费一年阅读会员，立省24元！
高一数学2.2.1-4对数
大小：1.07MB
登录百度文库，专享文档复制特权，财富值每天免费拿！
你可能喜欢正确教育旗下网站
网校：13141所
24小时更新：3386
总量：584263

学年高一数学新人教B版必修1教学课件：第3章 基本初等函数（Ⅰ） 3.2.1 第2课时 积、商、幂的对数
学年高一数学新人教B版必修1教学课件：第3章 基本初等函数（Ⅰ） 3.2.1 第2课时 积、商、幂的对数
时间： 16:27:59
下载量：28次
大小：2.03M
所属资料：
文档简介为自动调取，可能会显示内容不完整，请您查看完整文档内容。
在手机端浏览文档
1/292/293/294/295/296/29
预览已结束，查看更多内容需下载哦~
&#xe6热门推荐
&#xe6相关资源
官方微信公共账号
资源库-微信公众号
在手机端浏览

我要回帖

更多关于 47路 的文章

 

随机推荐