HP Fortran Programmer's Guide (September 2007)

Calling C routines from HP Fortran
Data types
Chapter 8180
Allocatable arrays may be passed from Fortran to C like any other array, with the precaution
about array differences between the two languages. Strings (an array of characters in C) are a
different matter; see “C strings” on page 189 for information about passing strings from
Fortran to C.