PROGRAM MAIN
      IMPLICIT NONE

! declaration d'interface de fonction 
      interface 
        subroutine check_table(k, a, b, c)
          integer, intent (in) :: k
          double precision, intent (in), dimension(:,:) :: a,b,c
        end subroutine check_table
      end interface 

      integer, parameter :: NL = 2, NC=2
      double precision, dimension (NL, NC) :: m1,m2,m3,m4

      integer :: i,j,k
      
      integer :: N = 5000000

      print *, '--- timing test : N=', N, ' NL=', NL, ' NC=',NC
      do k=1,N
        m1 = 0
        m2 = 0
        do i=1,NL
          do j=1,NC
            m1(i,j) = k*300+10.*i+j
            m2(i,j) = k*550+20.*i+2.*j;
          enddo
        enddo
        m3 = m1+m2;
        m4 = m1*m2;
        call check_table(k, m2, m3, m4)
!        if (k .eq. 1) then
!           print *, 'm1=', m1        
!           print *, 'm2=', m2
!           print *, 'm3=', m3
!           print *, 'm4=', m4
!        endif
      enddo

      print *, '------- end of matrixf.f90 ------------'
      end


      subroutine check_table(k, a, b, c)
        integer, intent (in) :: k
        double precision, intent (in), dimension(:,:) :: a,b,c
      
      if ((k.eq.1) .or. (k.eq.50))  then 
        print *, 'check_table(',k, '...) size(a,1)= ', size(a,1), &
               ' size(a,2)= ', size(a,2)
      endif
      end subroutine check_table