A major feature of HP Fortran 90
is its compatibility with standard-conforming HP FORTRAN 77.
Both source files and object files from existing HP FORTRAN 77
applications can be migrated to HP Fortran 90
with comparatively little effort. However, some compile-line options
and nonstandard extensions in HP FORTRAN 77 programs
may have to be changed to compile and execute correctly under HP Fortran 90.
To smooth the migration path, HP Fortran 90
includes a number of extensions that are compatible with HP FORTRAN 77.
HP Fortran 90 also includes extensions that are
designed to ease the job of porting applications
from other vendors" Fortran dialects. For a summary list
of all HP Fortran 90 extensions, see the HP
Fortran 90 Programmer's Reference. For information about
porting other vendors' Fortran programs to HP Fortran 90,
see Chapter 11 “Porting to HP Fortran 90”.
This chapter discusses the following topics:
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