Open Watcom FORTRAN 77 Language Reference

Language Reference
12.3.58 Allocated Array
Definition:
Name:
ALLOCATED
Is array A allocated?
Usage:
L ←ALLOCATED(A)
12.3.59 Memory Location
Definition:
Name:
LOC
Location of A where A is any variable, array or array element
Usage:
I ←LOC(A)
12.3.60 Size of Variable or Structure
Definition:
Name:
ISIZEOF
Notes:
Size of A in bytes where A is any constant, variable, array, or structure
Usage:
I ←ISIZEOF(A)
The size reported for a constant or simple variable is based on its type. The size of a
CHARACTER constant is the number of characters in the constant. The size reported
for an array is the size of the storage area required for the array. The size reported for
a structure is the size of the storage area required for the structure. An assumed-size
CHARACTER variable, assumed-size array, or allocatable array has size 0.
12.3.61 Volatile Reference
Definition:
Name:
VOLATILE
Notes:
A is a volatile reference
Usage:
A ←VOLATILE(A)
A volatile reference to a symbol indicates that the value of the symbol may be
modified in ways that are unknown to the subprogram. For example, a symbol in
common being referenced in a subprogram may be modified by another subprogram
that is processing an asynchronous interrupt. Therefore, any subprogram that is
referencing the symbol to determine its value should reference this symbol using the
VOLATILE intrinsic function so that the value currently being evaluated agrees with
the value last stored.
270 Intrinsic Functions