=====frexp=====
Syntax:

<code>
    #include <cmath>
    double frexp( double num, int* exp );
</code>
The function frexp() is used to decompose num into two parts: a mantissa
between 0.5 and 1 (returned by the function) and an exponent returned as exp.
Scientific notation works like this:

<code>
     num = mantissa * (2 ^ exp)
</code>

C++ also provides the following overloaded forms:
<code>
    #include <cmath>
    float frexp( float num, int* exp ); // same as frexpf() in C99
    long double frexp( long double num, int* exp ); // same as frexpl() in C99
</code>

Related Topics: [[ldexp]], [[modf]]