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58 lines
2.3 KiB
Markdown
58 lines
2.3 KiB
Markdown
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Extensions, deletions, and legacy features supported
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====================================================
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* Tabs in source
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* `<>` as synonym for `.NE.` and `/=`
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* `$` and `@` as legal characters in names
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* `.T.` and `.F.`
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* Initialization in type declaration statements using `/values/`
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* Kind specification with `*`, e.g. `REAL*4`
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* `DOUBLE COMPLEX`
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* Signed complex literal constants
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* `.XOR.` as predefined operator (can be overridden)
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* `.N.`, `.A.`, `.O.`, `.X.` predefined operator synonyms
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* `STRUCTURE`, `RECORD`, `UNION`, and `MAP`
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* Structure field access with `.field`
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* `NCHARACTER` type and `NC` Kanji character literals
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* `BYTE` as synonym for `INTEGER(KIND=1)`
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* Quad precision REAL literals with `Q`
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* `X` prefix/suffix as synonym for `Z` on hexadecimal literals
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* `B`, `O`, `Z`, and `X` accepted as suffixes as well as prefixes
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* Triplets allowed in array constructors
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* Old-style `PARAMETER pi=3.14` statement (no parentheses)
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* `%LOC`, `%VAL`, and `%REF`
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* Leading comma allowed before I/O item list
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* Empty parentheses allowed in `PROGRAM P()`
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* Missing parentheses allowed in `FUNCTION F`
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* Cray based `POINTER(p,x)`
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* Arithmetic `IF`. (Which branch with NaN take?)
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* `ASSIGN` statement, assigned `GO TO`, and assigned format
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* `PAUSE` statement
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* Hollerith literals and edit descriptors
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* `NAMELIST` allowed in the execution part
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* Omitted colons on type declaration statements with attributes
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* COMPLEX constructor expression, e.g. `(x+y,z)`
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* `+` and `-` before all primary expressions, e.g. `x*-y`
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* `.NOT. .NOT.` accepted
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* `NAME=` as synonym for `FILE=`
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* `DISPOSE=`
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* Data edit descriptors without width or other details
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* Backslash escape character sequences in quoted character literals
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* `D` lines in fixed form as comments or debug code
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Extensions and legacy features deliberately not supported
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---------------------------------------------------------
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* `.LG.` as synonym for `.NE.`
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* `REDIMENSION`
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* Allocatable `COMMON`
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* Expressions in formats
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* `ACCEPT` as synonym for `READ *`
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* `ARRAY` as synonym for `DIMENSION`
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* `VIRTUAL` as synonym for `DIMENSION`
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* `ENCODE` and `DECODE` as synonyms for internal I/O
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* `IMPLICIT AUTOMATIC`, `IMPLICIT STATIC`
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* Default exponent of zero, e.g. `3.14159E`
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* Characters in defined operators that are neither letters nor digits
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* `B` suffix on unquoted octal constants
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* `Z` prefix on unquoted hexadecimal constants
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