Ternary logic: Difference between revisions
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Maybe ≡ False is Maybe Maybe ≡ Maybe is Maybe Maybe ≡ True is Maybe
True ≡ False is False True ≡ Maybe is Maybe True ≡ True is True</pre>
== Alternative version ==
{{works with|Julia|0.7}}
With Julia 1.0 and the new type <tt>missing</tt>, three-value logic is implemented by default
<lang julia># built-in: true, false and missing
using Printf
const tril = (true, missing, false)
@printf("\n%8s | %8s\n", "A", "¬A")
for A in tril
@printf("%8s | %8s\n", A, !A)
end
@printf("\n%8s | %8s | %8s\n", "A", "B", "A ∧ B")
for (A, B) in Iterators.product(tril, tril)
@printf("%8s | %8s | %8s\n", A, B, A & B)
end
@printf("\n%8s | %8s | %8s\n", "A", "B", "A ∨ B")
for (A, B) in Iterators.product(tril, tril)
@printf("%8s | %8s | %8s\n", A, B, A | B)
end
@printf("\n%8s | %8s | %8s\n", "A", "B", "A ≡ B")
for (A, B) in Iterators.product(tril, tril)
@printf("%8s | %8s | %8s\n", A, B, A == B)
end
⊃(A, B) = B | !A
@printf("\n%8s | %8s | %8s\n", "A", "B", "A ⊃ B")
for (A, B) in Iterators.product(tril, tril)
@printf("%8s | %8s | %8s\n", A, B, A ⊃ B)
end</lang>
=={{header|Kotlin}}==
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