Interactive Examples of Prism Support for Fortran 90 Pointers

If pn1 does not point to any value, an attempt to access it will result in an error message:

(prism) p pn1
Fortran variable is not allocated/associated.

You can find the state of a pointer using the whatis command. Assume pn1 has not been associated:

(prism) whatis pn1
node pn1 ! unallocated f90 pointer

Assume pn1 has been associated with a value:

(prism) whatis pn1
node pn1 ! f90 pointer