intrinsic_product.f90 [plain text]
! Program to test the PRODUCT intrinsic
program testproduct
implicit none
integer, dimension (3, 3) :: a
integer, dimension (3) :: b
logical, dimension (3, 3) :: m
a = reshape ((/1, 2, 3, 4, 5, 6, 7, 8, 9/), (/3, 3/));
b = product (a, 1)
if (any(b .ne. (/6, 120, 504/))) call abort
if (product (a) .ne. 362880) call abort
m = .true.
m(1, 1) = .false.
m(2, 1) = .false.
b = product (a, 2, m)
if (any(b .ne. (/28, 40, 162/))) call abort
if (product (a, mask=m) .ne. 181440) call abort
end program