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3.5.8 Operations of Floating Point Types
Static Semantics
1
The following attribute
is defined for every floating point subtype S:
2/1
 S'Digits

S'Digits denotes the requested
decimal precision for the subtype S. The value of this attribute is of
the type universal_integer. The requested decimal precision of
the base subtype of a floating point type T is defined to be the
largest value of d for which
ceiling(d * log(10) / log(T'Machine_Radix)) + g <= T'Model_Mantissa
where g is 0 if Machine_Radix is a positive power of 10 and 1 otherwise.
3
34 The
predefined operations of a floating point type include the assignment
operation, qualification, the membership tests, and explicit conversion
to and from other numeric types. They also include the relational operators
and the following predefined arithmetic operators: the binary and unary
adding operators  and +, certain multiplying operators, the unary operator
abs, and the exponentiation operator.
4
35 As for all types, objects
of a floating point type have Size and Address attributes (see 13.3).
Other attributes of floating point types are defined in A.5.3.
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