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Work on the FORTRAN 77 standard(追記) (X3J3/90.4, (追記ここまで)(追記) ISO (追記ここまで)(追記) 1539:1980) (追記ここまで) was initiated by ANSI in 1969 after a number ofcompiler vendors introduced extensions to the FORTRAN 66 standard. The standard was formally approved in 1978. It added a number of significant features to address many of the shortcomings of FORTRAN 66:

• Block IF and END IF statements, with optional ELSE and ELSE IF clauses, to provide improved language support for structured programming
• DO loop extensions, including parameter expressions, negative increments, and zero trip counts
• OPEN, CLOSE, and INQUIRE statements for improved I/O capability
• Direct-access file I/O
• IMPLICIT statement
• CHARACTER data type, with vastly expanded facilities for character input and output and processing of character-based data
• PARAMETER statement for specifying constants
• SAVE statement for persistent local variables
• Generic names for intrinsic functions
• A set of intrinsics (lge, lgt, lle, llt) for lexical comparison of strings, based upon the ASCII collating sequence.

An important practical extension to FORTRAN 77 was the release of MIL-STD-1753 in 1978. This specification, developed by the U.S. Department of Defense, standardized a number of features implemented by most FORTRAN 77 compilers but not included in the ANSI FORTRAN 77 standard. These features would eventually be incorporated into the Fortran 90 standard.

• DO WHILE and END DO statements
• INCLUDE statement
• IMPLICIT NONE variant of the IMPLICIT statement
• Bit manipulation intrinsic functions, based on similar functions included in Industrial Real-Time Fortran (ANSI/ISA S61.1 (1976))

Revised on September 23, 2010 09:00:32 by Jason Blevins (128.146.137.198) (1716 characters / 0.0 pages)

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