is there an option in Intel Fortran that ensures that variables in a subroutine retain their value when the subroutine is exited? I have not been able to find it so far.
Beware that it's an atomic bomb that will apply to every variable everywhere in your program. It could be better to explicitly save only variables when required with the option save in declarations.
I would strongly recommend using SAVE rather than an option. Figure out which variables need to be kept defined and give them the SAVE attribute. If you're asking this, make sure you are not also assuming that variables are preset to zero.
To make Steve's comment absolutely clear -- in Fortran, all variables are undefined unless initiailised -- so don't assume a variable that has not been initialised has a value of zero.
