Language Standards Conformance

The Fortran standard has undergone several revisions since its initial publication as FORTRAN IV (also known as FORTRAN 66). Subsequent revisions have been FORTRAN 77, Fortran 90, Fortran 95, Fortran 2003, Fortran 2008, and draft Fortran 2015. Each revision has added new features; some revisions have labeled features as "deprecated" (or obsolescent) or they have removed them. Intel Fortran continues to support deprecated and deleted features.

Intel® Fortran conforms to the Fortran 2003 standard (ISO/IEC 1539-1:2004), American National Standard Fortran 95 (ANSI X3J3/96-007)¹, and American National Standard Fortran 90 (ANSI X3.198-1992).²

It also includes support for many features in the Fortran 2008 standard (ISO/IEC 1539-1:2010) and some features from the draft Fortran 2015 standard.

The Fortran Standards committee is currently answering questions of interpretation on Fortran 2008 language features. Any answers given by the committee that are related to features implemented in Intel Fortran may result in changes in future releases of the Intel Fortran compiler, even if the changes produce incompatibilities with earlier releases of Intel Fortran.

Intel Fortran provides a number of extensions to the Fortran 2008 Standard. In the language reference, extensions (non-standard features) are displayed in this color.

Intel Fortran also includes support for programs that conform to the previous Fortran standards (ANSI X3.9-1978 and ANSI X3.0-1966), the International Standards Organization standard ISO 1539-1980 (E), the Federal Information Processing Institute standard FIPS 69-1, and the Military Standard 1753 Language Specification.