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Manual Reference Pages  - present (3)

NAME
present(3f) - [FORTRAN:INTRINSIC] Determine whether an optional dummy argument is specified

SYNTAX
result = present(a)

DESCRIPTION
Determines whether an optional dummy argument is present.

ARGUMENTS
A May be of any type and may be a pointer, scalar or array value, or a dummy procedure. It shall be the name of an optional dummy argument accessible within the current subroutine or function.

RETURN VALUE
Returns either TRUE if the optional argument A is present, or FALSE otherwise.

EXAMPLE
Sample program: 

    program demo_present
    implicit none
      write(*,*) f(), f(42)      ! "f t"
    contains
      logical function f(x)
        integer, intent(in), optional :: x
        f = present(x)
      end function
    end program demo_present

STANDARD
[[Fortran 95]] and later

CLASS
[[Inquiry function]]

present (3) March 11, 2021
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