For definitions of the terms used in these interfaces, see the ANSI/IEEE Standard 754-1985 for floating-point arithmetic.
These interfaces define constant attributes of the three built-in floating-point types:
INTERFACE Real; TYPE T = REAL;
CONST
Base: INTEGER = ...;
Precision: INTEGER = ...;
MaxFinite: T = ...;
MinPos: T = ...;
MinPosNormal: T = ...;
END Real.
INTERFACE LongReal; TYPE T = LONGREAL;
CONST
Base: INTEGER = ...;
Precision: INTEGER = ...;
MaxFinite: T = ...;
MinPos: T = ...;
MinPosNormal: T = ...;
END LongReal.
INTERFACE Extended; TYPE T = EXTENDED;
CONST
Base: INTEGER = ...;
Precision: INTEGER = ...;
MaxFinite: T = ...;
MinPos: T = ...;
MinPosNormal: T = ...;
END Extended.
The specification is the same for all three interfaces:
Base is the radix of the floating-point representation for T.
Precision is the number of base-Base digits of precision for T.
MaxFinite is the maximum finite value in T. For non-IEEE implementations, this is the same as LAST(T).
MinPos is the minimum positive value in T.
MinPosNormal is the minimum positive normal value in T; it differs from MinPos only for implementations (like IEEE) with denormalized numbers.
The CM Modula-3 versions are Real, LongReal, and Extended.