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GNU Info (g77-295.info)Fortran 90 FeaturesFortran 90 Features =================== For convenience this section collects a list (probably incomplete) of the Fortran 90 features supported by the GNU Fortran language, even if they are documented elsewhere. Note: Characters, Lines, and Execution Sequence, for information on additional fixed source form lexical issues. Further, the free source form is supported through the `-ffree-form' option. Other Fortran 90 features can be turned on by the `-ff90' option; see Note: Fortran 90. For information on the Fortran 90 intrinsics available, see Note: Table of Intrinsic Functions. Automatic arrays in procedures Character assignments In character assignments, the variable being assigned may occur on the right hand side of the assignment. Character strings Strings may have zero length and substrings of character constants are permitted. Character constants may be enclosed in double quotes (`"') as well as single quotes. Note: Character Type. Construct names (Symbolic tags on blocks.) Note: Construct Names. `CYCLE' and `EXIT' Note: The `CYCLE' and `EXIT' Statements. `DOUBLE COMPLEX' Note: `DOUBLE COMPLEX' Statement. `DO WHILE' Note: DO WHILE. `END' decoration Note: Statements. `END DO' Note: END DO. `KIND' `IMPLICIT NONE' `INCLUDE' statements Note: INCLUDE. List-directed and namelist I/O on internal files Binary, octal and hexadecimal constants These are supported more generally than required by Fortran 90. Note: Integer Type. `O' and `Z' edit descriptors `NAMELIST' Note: NAMELIST. `OPEN' specifiers `STATUS='REPLACE'' is supported. The `FILE=' specifier may be omitted in an `OPEN' statement if `STATUS='SCRATCH'' is supplied. `FORMAT' edit descriptors The `Z' edit descriptor is supported. Relational operators The operators `<', `<=', `==', `/=', `>' and `>=' may be used instead of `.LT.', `.LE.', `.EQ.', `.NE.', `.GT.' and `.GE.' respectively. `SELECT CASE' Not fully implemented. *Note `SELECT CASE' on `CHARACTER' Type: SELECT CASE on CHARACTER Type. Specification statements A limited subset of the Fortran 90 syntax and semantics for variable declarations is supported, including `KIND'. Note: Kind Notation. (`KIND' is of limited usefulness in the absence of the `KIND'-related intrinsics, since these intrinsics permit writing more widely portable code.) An example of supported `KIND' usage is: INTEGER (KIND=1) :: FOO=1, BAR=2 CHARACTER (LEN=3) FOO `PARAMETER' and `DIMENSION' attributes aren't supported. automatically generated by info2www version 1.2.2.9 |