1! Program to test the PRODUCT intrinsic
2program testproduct
3   implicit none
4   integer, dimension (3, 3) :: a
5   integer, dimension (3) :: b
6   logical, dimension (3, 3) :: m, tr
7   character(len=12) line
8
9   a = reshape ((/1, 2, 3, 4, 5, 6, 7, 8, 9/), (/3, 3/));
10
11   b = product (a, 1)
12
13   tr = .true.
14
15   if (any(b .ne. (/6, 120, 504/))) call abort
16
17   write (line, 9000) product(a,1)
18   if (line .ne. '   6 120 504') call abort
19
20   if (product (a) .ne. 362880) call abort
21
22   write (line, 9010) product(a)
23   if (line .ne. '362880') call abort
24
25   m = .true.
26   m(1, 1) = .false.
27   m(2, 1) = .false.
28
29   b = product (a, 2, m)
30   if (any(b .ne. (/28, 40, 162/))) call abort
31
32   b = product (a, 2, m .and. tr)
33   if (any(b .ne. (/28, 40, 162/))) call abort
34
35   write (line, 9000) product(a, 2, m)
36   if (line .ne. '  28  40 162') call abort
37
38   if (product (a, mask=m) .ne. 181440) call abort
39
40   if (product (a, mask=m .and. tr) .ne. 181440) call abort
41
42   write (line, 9010) product(a, mask=m)
43   if (line .ne. '181440') call abort
44
459000 format (3I4)
469010 format (I6)
47end program
48