# Summary of Language Extensions

This appendix summarizes the Intel® Fortran language extensions to the ANSI/ISO Fortran 2003 Standard.

Most extensions are available on all supported operating systems. However, some extensions are limited to one or more platforms. If an extension is limited, it is labeled.

Parent topic: Language Reference

- Language Extensions: Source Forms
- Language Extensions: Names
- Language Extensions: Character Sets
- Language Extensions: Intrinsic Data Types
- Language Extensions: Constants
- Language Extensions: Expressions and Assignment
- Language Extensions: Specification Statements
- Language Extensions: Execution Control
- Language Extensions: Compilation Control Lines and Statements
- Language Extensions: Built-In Functions
- Language Extensions: I/O Statements
- Language Extensions: I/O Formatting
- Language Extensions: File Operation Statements
- Language Extensions: Compiler Directives
- Language Extensions: Intrinsic Procedures
- Language Extensions: Additional Language Features
- Language Extensions: Run-Time Library Routines