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The standard of Fortran used for the coding of CHR is fundamentally
Fortran 77, using the Starlink Fortran coding conventions described in SGP/16.
Several common extensions to the Fortran 77 standard are used in source
code for CHR, they are as follows:
- End-of-line comments using the ``!'' symbol;
- Symbolic subprogram names may be longer than six characters (but are
always shorter than ten characters);
- Symbolic subprogram names include the ``_'' symbol;
- Symbolic constant names may be longer than six characters (but are always
shorter than eleven characters);
- Symbolic constant names may include the ``_'' symbol;
- The full ASCII character set is assumed in character constants.
The CHR library currently has no dependence upon any other package.
To use CHR on any computer system porting effort is required only for those
CHR routines which have operating system dependencies: these routines are
listed in the following section.

Next: Operating system specific routines
Up: Portability
Previous: Overview
CHR Character Handling Routines
Starlink User Note 40
A C Charles
P C T Rees
A J Chipperfield
2 August 1995
E-mail:ussc@star.rl.ac.uk