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+! File : runme.f90
+program runme
+ use ISO_FORTRAN_ENV
+ implicit none
+ integer, parameter :: STDOUT = OUTPUT_UNIT
+
+ call run()
+contains
+
+subroutine run()
+ use example
+ use iso_c_binding
+ implicit none
+
+ type(Circle) :: c
+ type(Square), target :: s ! 'target' allows it to be pointed to
+ class(Shape), pointer :: sh
+ integer(C_INT) :: n_shapes
+
+ ! ----- Object creation -----
+
+ write(STDOUT,*) "Creating some objects"
+ c = Circle(10.0d0)
+ s = Square(10.0d0)
+
+ ! ----- Access a static member -----
+ write(STDOUT,'(a,i2,a)')"A total of", s%get_nshapes(), " shapes were created"
+
+ ! ----- Member data access -----
+
+ ! Notice how we can do this using functions specific to
+ ! the 'Circle' class.
+ call c%set_x(20.0d0)
+ call c%set_y(30.0d0)
+
+ ! Now use the same functions in the base class
+ sh => s
+ call sh%set_x(-10.0d0)
+ call sh%set_y( 5.0d0)
+
+ write(STDOUT,*)"Here is their current position:"
+ write(STDOUT,'(a,f5.1,a,f5.1,a)')" Circle = (", c%get_x(), ",", c%get_y(), " )"
+ write(STDOUT,'(a,f5.1,a,f5.1,a)')" Square = (", s%get_x(), ",", s%get_y(), " )"
+
+ ! ----- Call some methods -----
+
+ write(STDOUT,*)"Here are some properties of the shapes:"
+ call print_shape(c)
+ call print_shape(s)
+
+ ! ----- Delete everything -----
+
+ ! Note: this invokes the virtual destructor
+ call c%release()
+ call s%release()
+
+ n_shapes = c%get_nshapes()
+ write(STDOUT,*) n_shapes, "shapes remain"
+ if (n_shapes /= 0) then
+ write(STDOUT,*) "Shapes were not freed properly!"
+ stop 1
+ endif
+
+ write(STDOUT,*) "Goodbye"
+end subroutine
+
+subroutine print_shape(s)
+ use example, only : Shape
+ use iso_c_binding
+ implicit none
+ class(Shape), intent(in) :: s
+
+ write(STDOUT,*)" area = ",s%area()
+ write(STDOUT,*)" perimeter = ",s%perimeter()
+end subroutine
+
+end program