Character set

The Fortran 90 character set consists of letters, digits, the underscore character, and special characters, as detailed in Table 2-1 “ Fortran 90 character set”.

The processor character set consists of the Fortran 90 character set, plus:

Control characters (Tab, Newline , and Carriage Return). Carriage Return and Tab are usually treated as "white space" in a source program. Their use may affect the appearance of a listing file.
The hash character (#), which may appear in column 1 to initiate a comment; this is an extension.

Any other characters in the HP character set. Refer to Appendix B, HP character set. The other characters may be used in character constants, character string edit descriptors, comments, and I/O records.

Table 2-1 Fortran 90 character set

Category	Characters
Letters	`A` to `Z`, `a` to `z` ^[1]
Digits	`0` to `9`
Underscore	_
Special characters	blank (space) `= + - * / ( ) , . '` `: ! " % & ; < > ?` ^[2] `$`
^[1]Lowercase alphabetic characters are equivalent to uppercase characters except when they appear in character strings or Hollerith constants. ^[2]Although "`?`" has been designated a special character, it has no special meaning in the Fortran 90 language.

HP Fortran 90 supports only the default character type,which has kind parameter = 1, as described in Chapter 3. However, support is provided for the use of Extended UNIX Code (EUC) and Shift-JIS encoding. See Appendix B for details.

Character set

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