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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
Edited 27-Sep-12 19:06pm
v2
Comments
Kenneth Haugland at 28-Sep-12 1:06am
   
x = Math.Log(3000)/Math.Log(2) ?
Spacez Ly Wang at 28-Sep-12 1:28am
   
Thank you, Maths Genius.
Kenneth Haugland at 28-Sep-12 1:29am
   
Kidding?!?

1 solution

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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).
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