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double                   Double-Precision Floating-Point Data Type

    The double type declares an object to be of "double-precision"
    floating-point type.  The size (and representation) of a double
    object is implementation-defined.  A double is the same or greater in
    size than a float.

      Notes:    In MS-C, the size of a double object is eight bytes.  The
                IEEE representation consisting of a sign bit, an 11-bit
                excess 1023 binary exponent, and a 52-bit mantissa is
                used.  The mantissa represents a number between 1.0 and
                2.0, and since the high-order bit of the mantissa is
                always 1, it is not stored in the number.  The range of
                values is approximately 1.7E-308 to 1.7E+308.

                All floating-point constants have type double. There is
                no way to specify a float constant.

                The decision between using double and float is one of
                space versus run-time conversion cost.

                The type long float is a synonym for the type double. It
                has nothing to do with the float type.

  -------------------------------- Example ---------------------------------

           double value = 1.234;
           double d1 = 1.234E-24;

           value = (double) 123;