{{keywords>wiki library source code example reference}}
===== frexp =====
<code cpp>
    double frexp(double);
</code>
Mantissa m. in *n is the exponent.

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

using namespace std;
int main ( void ) 
{
  double x;
  int n;

  x = 42.0;
  
  //cout.setf(ios::fixed, ios::floatfield);
  cout.precision(8);

  cout << frexp (x, &n) << " * 2^" << n << " = " << x << endl;
  return 0;
}



</code>
==== output ====
     0.65625 * 2^0 = 42