program main implicit none real*8, allocatable :: x(:), a(:), b(:) real*8 time integer*8 time0, time1, dtime integer i, j, n, m c n = 10000 m = 10000 c Initialization allocate(x(n), a(n), b(n)) do i=1,n a(i) = rand() b(i) = rand() end do c Start time call system_clock(time0) c Main calculation do j=1,m do i=1,n x(i) = (a(i) + b(i)) / (a(i) * b(i)) 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, a, b) end program