program main implicit none real*8, allocatable :: x(:), y(:) real*8 time integer*8 time0, time1, dtime integer i, j, n, m c n = 10000 m = 50000 c Initialization allocate(x(n), y(n)) do i=1,n x(i) = rand() end do c Start time call system_clock(time0) c Main calculation do j=1,m do i=1,n y(i) = x(i) + 2d0 end do end do c Finish time call system_clock(time1, dtime) c Output time time = 1d0*(time1-time0)/dtime write(*,"(a7,f16.7)")"Time = ",time deallocate(x, y) end program