An array reference in which any subscript falls
outside declared
bounds for that dimension is called an
invalid subscript.
Invalid subscripts are a common cause of answers that vary between
optimization levels and programs that
abort and dump core. Use the command-line option -C
(check subscripts) with f90 or
f77 to check that each subscript
is within its array bounds. See the f90(1) or f77(1) man page for
more information. The C and aC++ compilers do
not have an option corresponding to the Fortran compilers'
-C option.
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