HP SunSoft Pascal 4.0 - Manual (Page 191)

The FORTRAN–Pascal Interface 167
8
Pascal Set Types
In Pascal, a set type is implemented as a bit vector, which is similar to a
FORTRAN 16-bit word. Direct access to individual elements of a set is highly
machine-dependent and should be avoided.
Multidimensional Arrays
Pascal multidimension arrays are incompatible with FORTRAN multi-
dimension arrays. Since Pascal arrays use row-major indexing, and FORTRAN
arrays use column-major indexing, an array passed in either direction appears
to be transposed.
General Parameter-Passing in FORTRAN and Pascal
A few general rules apply to passing parameters:
• By default, FORTRAN passes all parameters by reference.
• In FORTRAN, if you want to pass anything by value, then you must
explicitly use the nonstandard function
%VAL() .
• Pascal passes all parameters by value unless you explicitly state that they
are
var , out , or in out parameters, in which case they are passed by
reference.
• The routine options nonpascal , extern fortran , and external
fortran pass by reference.