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program variables_01
implicit none
integer :: x, y
x = 2
y = 3
if (x /= 2) error stop
if (y /= 3) error stop
x = y
if (x /= 3) error stop
if (y /= 3) error stop
y = 1
if (y == 1) x = 1
if (y /= 1) x = 2
if (x /= 1) error stop
y = 2
if (y == 1) x = 1
if (y /= 1) x = 2
if (x /= 2) error stop
x = 2
y = 1
if (y == 1) x = x + 1
if (y /= 1) x = x - 1
if (x /= 3) error stop
x = 2
y = 2
if (y == 1) x = x + 1
if (y /= 1) x = x - 1
if (x /= 1) error stop
end program
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