C How to get x of 2^x=3000? /* 2 power x equal to 3000 */

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I need your help writing in C, compile with GCC.

2^x=i

int i will get from user command line;
the main function is to get x;
x will output as integer;
if x output as float,i.e, 3.2, the function outputs 3 dropping value behind " . ";
how to write in C Program?
I appreciate any kind of programming type and your help.
I'm beginner.

Posted 27-Sep-12 19:03pm

Spacez Ly Wang

Updated 27-Sep-12 19:06pm

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Kenneth Haugland 28-Sep-12 1:06am

x = Math.Log(3000)/Math.Log(2) ?

Spacez Ly Wang 28-Sep-12 1:28am

Thank you, Maths Genius.

Kenneth Haugland 28-Sep-12 1:29am

Kidding?!?

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Bernhard Hiller · Accepted Answer · 2012-09-27T21:07:00

Solution 1

The thing is called "binary logarithm". Isn't there a log2(number) function in C++? If not, then take some other logarithm, and some math: log(number)/log(2).

Posted 27-Sep-12 21:07pm

Bernhard Hiller