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FORTRAN 77
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Work on the **FORTRAN 77** standard (X3J3/90.4, ISO 1539:1980) was initiated by ANSI in 1969
after a number of Compilers | compiler 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))
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* Fortran 2023 Draft Standard - Fortran ISO-IEC Standard
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