Ada Reference Manual (Ada 2022) — Legal Information

# Annex G

## (normative)

# Numerics

1
The Numerics Annex specifies
2
features for complex arithmetic, including complex I/O;
3
a mode (“strict mode”), in which the predefined arithmetic operations of floating point and fixed point types and the functions and operations of various predefined packages have to provide guaranteed accuracy or conform to other numeric performance requirements, which the Numerics Annex also specifies;
4/5
a mode (“relaxed mode”), in which there are no accuracy or other numeric performance requirements to be satisfied, as for implementations not conforming to the Numerics Annex;
5/2
models of floating point and fixed point arithmetic on which the accuracy requirements of strict mode are based;
6/2
the definitions of the model-oriented attributes of floating point types that apply in the strict mode; and
6.1/2
features for the manipulation of real and complex vectors and matrices.

#### Implementation Advice

7/3
If Fortran (respectively, C) is widely supported in the target environment, implementations supporting the Numerics Annex should provide the child package Interfaces.Fortran (respectively, Interfaces.C) specified in Annex B and should support a convention_identifier of Fortran (respectively, C) for the Convention aspect (see Annex B), thus allowing Ada programs to interface with programs written in that language.

Ada 2005 and 2012 Editions sponsored in part by Ada-Europe