present(3I)

NAME
     PRESENT - Determines whether an optional argument is present

SYNOPSIS
     PRESENT ([A=]a)

STANDARDS
     Fortran

DESCRIPTION
     The PRESENT intrinsic function determines whether an optional dummy
     argument is present.  It accepts the following argument:

     a         Must be an optional dummy argument of the procedure in which
               the PRESENT function reference appears

     PRESENT is an inquiry function.  The name of this intrinsic cannot be
     passed as an argument.

RETURN VALUES
     The result type is a default logical scalar.  The result has the value
     TRUE if a is present and otherwise has the value FALSE.