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program subroutines_02
implicit none
integer :: i, j
i = 1
j = 1
call f(i, j)
print *, i, j
if (i /= 1) error stop
if (j /= 2) error stop
call g(i, j)
print *, i, j
if (i /= 1) error stop
if (j /= 0) error stop
call h(i, j)
print *, i, j
if (i /= 1) error stop
if (j /= 0) error stop
contains
subroutine f(a, b)
integer, intent(in) :: a
integer, intent(out) :: b
b = a + 1
end subroutine
subroutine g(a, b)
integer, intent(in) :: a
integer, intent(out) :: b
b = a - 1
end subroutine
subroutine h(a, b)
integer, intent(in) :: a
integer, intent(out) :: b
call g(a, b)
end subroutine
end program
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