Sun Studio 12: Fortran User's Guide

3.4.136 –xinterval[={widestneed|strict|no}]

(SPARC) Enable interval arithmetic extensions.

The optional value can be one of either no, widestneed or strict. The default if not specified is widestneed.


Interval arithmetic extensions not enabled. 


Promotes all non-interval variables and literals in any mixed-mode expression to the widest interval data type in the expression. 


Prohibits mixed-type or mixed-length interval expressions. All interval type and length conversions must be explicit. 

Fortran 95 extensions for interval arithmetic calculations are detailed in the Fortran 95 Interval Arithmetic Programming Reference. See also 3.4.133 –xia[={widestneed|strict}].