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How to take antilog of any number in c++

Posted on 2004-04-01
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Last Modified: 2007-12-19
Hi experts!

 I have a problem and i m sure not a great one for you.please help me ant tell how to take antilogarithm of any number in c++ by using any function or in whatever way?

plz help me and solve my this problem...???
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Question by:jadoogar
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6 Comments
 
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Accepted Solution

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Lescha earned 50 total points
ID: 10731326
Huh? You mean calculate the exponent?
There are functions like 'exp' and 'pow' for that.
1
 
LVL 11

Expert Comment

by:bcladd
ID: 10733448
yep, exp is the function you want.

#include <cmath>
using namespace std;

cout << exp(log(1.3)) << endl;

prints 1.3 (as you would hope).

-bcl
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LVL 12

Expert Comment

by:stefan73
ID: 10733455
Yep, exp is the inverse logarithm or antilogarithm.
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LVL 1

Expert Comment

by:Lescha
ID: 10740453
You don't have to include cmath, or to use namespace. It is enough to

#include <math.h>

and then either cout or printf whatever you like.
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Expert Comment

by:bcladd
ID: 10740503
#include <math.h>

includes the standard C math header

#include <cmath>

includes the standard C++ header (wraps the C standard file functionality (the c at the front of the file name) in the C++ std namespace).

So, actually, either works.

-bcl
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LVL 1

Expert Comment

by:Lescha
ID: 10756374
Excuse me, but why "C"? What was wrong or unsatisfactory with my answer?
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