{{keywords>wiki library source code example reference}}
===== ldexp =====
<code c>
    double ldexp(double , int exp);
</code>
Returns x times 2 raised to n


===== C Sourcecode Example =====
compile in linux with: gcc ldexp.c -o ldexp **-lm** -Wall
<code c>     
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <math.h> /* including math library */

int main ( void ) 
{

  printf ("4.2 raised to 2 is %f\n", ldexp(4.2, 2));
  return 0;
}



</code>

==== output ====
   output:
   user@host:~$ ./ldexp 
   4.2 raised to 2 is 16.8000