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subroutine increment_ctr(n, ctr)
use omp_lib
implicit none
integer, intent(in) :: n
real, intent(out) :: ctr
real :: local_ctr
integer :: i
local_ctr = 1
!$omp parallel private(i) reduction(*:local_ctr)
!$omp do
do i = 1, n
local_ctr = local_ctr * 1.5
end do
!$omp end do
!$omp end parallel
ctr = ctr + local_ctr
end subroutine
program openmp_08
use omp_lib
integer, parameter :: n = 10
real :: ctr
real :: res = 1.5**10
call omp_set_num_threads(8)
ctr = 0
call increment_ctr(n, ctr)
print *, ctr
if(abs((ctr - res)) > 0.0002 ) error stop
end program
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