Oracle C++ Call Interface Programmer's Guide

Number Class
Number Class
The Number class handles limited-precision signed base 10 numbers. A Number
guarantees 38 decimal digits of precision. All positive numbers in the range
displayed here can be represented to a full 38-digit precision:
10^-130
and
9.99999999999999999999999999999999999999*10^125
The range of representable negative numbers is symmetrical.
The number zero can be represented exactly. Also, Oracle numbers have
representations for positive and negative infinity. These are generally used to
indicate overflow.
The internal storage type is opaque and private. Scale is not preserved when
Number instances are created.
Number does not support the concept of NaN and is not IEEE-754-85 compliant.
Number does support +Infinity and -Infinity.
There are several variants of syntax:
Default constructor.
Number();
Number(const Number &srcNum);
Translates a native long double into a Number. The Number is created using the
precision of the platform-specific constant LDBL_DIG.
Number(long double val);
Translates a native double into a Number. The Number is created using the precision
of the platform-specific constant DBL_DIG.
Number(double val);
Translates a native float into a Number. The Number is created using the precision of
the platform-specific constant FLT_DIG.
Number(float val);
OCCI Classes and Methods 8-101