PGI Fortran Reference manual - The Portland Group

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PREFACEThis manual describes the Portland Group's implementation of the FORTRAN 77, Fortran 90/95,and Fortran 2003 languages. Collectively, The Portland Group compilers that implement theselanguages are referred to as the PGI Fortran compilers. This manual is part of a set of documentsdescribing the Fortran language and the compilation tools available from The Portland Group. Itpresents the Fortran language statements, intrinsics, and extension directives.Two Compilers represent the PGI Fortran compiler products. Fortran 77 (pgf77) is one of them.pgf90, pgf95, and pgfortran are the same compiler that has evolved from Fortran 90 to Fortran2003 standards. The older names are supported so that makefiles that were written using pgf90/pgf95, will still work. All three names refer to the same one compiler that supports the Fortran2003 language standard.The Portland Group’s Fortran compilation system includes a compilation driver, multiple Fortrancompilers, associated runtime support and mathematical libraries, and associated softwaredevelopment tools for debugging and profiling the performance of Fortran programs. Dependingon the target system, The Portland Group’s Fortran software development tools may also includean assembler or a linker. You can use these tools to create, debug, optimize and profile yourFortran programs. Related Publications lists other manuals in the PGI documentation set.Audience DescriptionThis manual is intended for people who are porting or writing Fortran programs using the PGIFortran compilers. To use Fortran you should be aware of the role of Fortran and of sourcelevelprograms in the software development process and you should have some knowledge ofa particular system or workstation cluster. To use the PGI Fortran compilers, you need to befamiliar with the Fortran language FORTRAN77, Fortran 90/95, or F2003 as well as the basiccommands available on your host system.Compatibility and Conformance to StandardsThe PGI Fortran compilers, PGF77 and PGFORTAN, run on a variety of 32-bit and 64-bit x86processor-based host systems. The PGF77 compiler accepts an enhanced version of FORTRAN77 that conforms to the ANSI standard for FORTRAN 77 and includes various extensions fromVAX/VMS Fortran, IBM/VS Fortran, and MIL-STD-1753. The PGFORTRAN compiler acceptsa similarly enhanced version of the ANSI standard for Fortran 90/95/2003.PGI Fortran Reference Guide xxiv
PrefaceFor further information on the Fortran language, you can also refer to the following:‣ American National Standard Programming Language FORTRAN, ANSI X3. -1978 (1978).‣ ISO/IEC 1539 : 1991, Information technology – Programming Languages – Fortran, Geneva,1991 (Fortran 90).‣ ISO/IEC 1539 : 1997, Information technology – Programming Languages – Fortran, Geneva,1997 (Fortran 95).‣ ISO/IEC 1539-1 : 2004, Information technology – Programming Languages – Fortran,Geneva, 2004 (Fortran 2003).‣ Fortran 95 Handbook Complete ISO/ANSI Reference, Adams et al, The MIT Press,Cambridge, Mass, 1997.‣ Fortran 2003 Handbook, The Complete Syntax, Features and Procedures, Adams et al,Springer; 1st Edition. 2008.‣ OpenMP Fortran Application Program Interface, Version 3.1, July 2011, http://www.openmp.org.‣ Programming in VAX Fortran, Version 4.0, Digital Equipment Corporation (September,1984).‣ IBM VS Fortran, IBM Corporation, Rev. GC26-4119.‣ Military Standard, Fortran, DOD Supplement to American National Standard ProgrammingLanguage Fortran, ANSI x.3-1978, MIL-STD-1753 (November 9, 1978).OrganizationThis guide is divided into the following sections and appendices:Language Overview, provides an introduction to the Fortran language.Fortran Data Types, describes the data types supported by PGI Fortran compilers and providesexamples using various data types. It also contains information on memory allocation andalignment issue.Fortran Statements, briefly describes each Fortran statement that the PGI Fortran compilersaccept. Longer descriptions are available for PGI extensions.Fortran Arrays, describes special characteristics of arrays in Fortran 90/95.Input and Output, describes the input, output, and format statements that allow programs totransfer data to or from files.Fortran Intrinsics, lists the Fortran intrinsics and subroutines supported by the PGI Fortrancompilers.Object Oriented Programming, provides a high-level overview of procedures, functions, andattributes from Fortran 2003 that facilitate an object-oriented approach to programming.OpenMP Directives for Fortran, lists the language extensions that the PGI Fortran compilerssupport.Functions and VAX Subroutines, describes the functions and subroutines in the Fortran runtimelibrary and discusses the VAX/VMS system subroutines and the built-in functions supported bythe PGI Fortran compilers.PGI Fortran Reference Guide xxv
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Chapter 4.FORTRAN ARRAYSFortran arr
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Input and OutputOn output, if l is
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Input and OutputThe basic form of t
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Input and Output5.7. List-directed
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Fortran Intrinsics6.1.1. Fortran 90
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Object Oriented ProgrammingInherita
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PGI Fortran Reference manual - The Portland Group

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