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In the subprogram being invoked or called is the dummyĪrgument list. The argument list in the invoking or calling program is Them back and return control to the invoking or calling Uses these arguments to compute the results and to pass Normally, the invoking or calling program passes In Fortran,įunctions are invoked or referenced subroutines areĬalled.
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Referred to as the invoking or calling program. Perform a specific task on behalf of another program unit, Subprograms are program units whose purpose is to Note that since subprograms are optional, the executable program does not need to have any Program unit into several units of more manageable size.Įach of these units could be tested and debugged individually, and later assembled into an executable program.Īn executable program is a set of logically related program units comprising exactly one main program and zero When dealing with complex applications, it is often advisable to segment a large This chapter describes the use of subprograms, specifically functions and subroutines. Subprograms are optional therefore, we had no need to deal with them until Subprograms, were mentioned in Section 1.1 when listing In the preceding chapters, we have written, compiled, andĮxecuted Fortran programs using only the principal program unit, or main program. Fortran language, Fortran for Scientists and Engineers, Copyright © 2009 V.
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