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! Test: Multiple independent COMMON blocks in same program unit (F2018 8.10.3)
! Verifies that different named COMMON blocks have independent storage.
! Modifications to one block should not affect variables in another block.
program common_22
implicit none
integer :: a1, a2
real :: b1, b2
common/blk1/a1, a2
common/blk2/b1, b2
a1 = 10
a2 = 20
b1 = 1.5
b2 = 2.5
call sub_access_both()
call sub_verify_independence()
print *, "PASS: common_22"
end program
subroutine sub_access_both()
implicit none
integer :: x1, x2
real :: y1, y2
common/blk1/x1, x2
common/blk2/y1, y2
! Verify both blocks accessible
if (x1 /= 10) error stop "x1 should be 10"
if (x2 /= 20) error stop "x2 should be 20"
if (abs(y1 - 1.5) > 0.001) error stop "y1 should be 1.5"
if (abs(y2 - 2.5) > 0.001) error stop "y2 should be 2.5"
! Modify both blocks
x1 = 100
y1 = 10.5
end subroutine
subroutine sub_verify_independence()
implicit none
! Access only blk1 - should not affect blk2
integer :: p, q
common/blk1/p, q
if (p /= 100) error stop "p should be 100"
p = 999
end subroutine
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