1:       program main
  2: #include <petsc/finclude/petscsys.h>
  3:       use petscsys
  4:       implicit none
  5:       character(len=256) :: filename
  6:       character(len=1)   :: mode
  7:       PetscBool          :: exists
  8:       PetscErrorCode     :: ierr
  9:       PetscCallA(PetscInitialize(ierr))
 10:       filename = 'filename'
 11:       mode = 'r'
 12:       PetscCallA(PetscTestFile(filename, mode, exists, ierr))
 13:       write(*, '(A, A, A, I0)') "File ", trim(filename), " doesn't exist = ", merge(1, 0, exists)
 14:       PetscCallA(PetscFinalize(ierr))
 15:       end
 16: !/*TEST
 17: !
 18: !   test:
 19: !
 20: !TEST*/