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


===== cpp Sourcecode Example =====
<code cpp>     
#include <iostream> /* including standard library */
#include <cmath> /* including math library */

using namespace std;
int main ( void ) 
{

  //cout.setf(ios::fixed, ios::floatfield);
  cout.precision(8);

  cout << "4.2 raised to 2 is " <<  ldexp(4.2, 2) << endl;
  return 0;
}



</code>

==== output ====
   4.2 raised to 2 is 16.8