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subroutine increment_ctr(n, ctr)
use omp_lib
implicit none
integer, intent(in) :: n
complex, intent(inout) :: ctr
complex :: local_ctr
integer :: i
local_ctr = (0,0)
!$omp parallel private(i) reduction(+:local_ctr)
!$omp do
do i = 1, n
local_ctr = local_ctr + i
end do
!$omp end do
!$omp end parallel
ctr = ctr + local_ctr
end subroutine
program openmp_06
use omp_lib
integer, parameter :: n = 1000
complex :: ctr
complex :: res = (0,0)
res = ((n * (n+1))/2) ! Sum from 1 -> 1000
call omp_set_num_threads(8)
ctr = (0,0)
call increment_ctr(n, ctr)
print *, ctr
if(ctr /= res) error stop
end program
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