In C#, if you want to indicate that an integer may or may not be there, you can mark it nullable, like this: int? x = null; This is useful when you don’t have a value that’s “invalid”, like 0, that lets you know the value isn’t there. In Fortran, marking a scalar allocatable achieves a similar res…

Yes, the language states that all allocatable variables and components have an initial status of unallocated.

Can I guarantee `allocatable` variables to start out not allocated?

shahmoradi November 22, 2024, 5:17pm 5

This is a relevant discussion:

Maybe the new gfortran has improved.

1 Like

Topic		Replies	Views
GFortran implicit deallocation? Help	9	524	March 8, 2024
Example from Reinhold Bader's tutorial - curious result	13	468	March 11, 2025
Undefined variables Help	12	1440	June 11, 2022
Best practice: Deallocating allocatable arrays explicitly vs implicitly Help	14	2882	March 31, 2022
Inquire status of (non)allocatable arrays	16	897	November 5, 2023