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Forth arithmetic is not checked, i.e., you will not hear about integer
overflow on addition or multiplication, you may hear about division by
zero if you are lucky. The operator is written after the operands, but
the operands are still in the original order. I.e., the infix 2-1
corresponds to 2 1 -. Forth offers a variety of division
operators. If you perform division with potentially negative operands,
you do not want to use / or /mod with its undefined
behaviour, but rather fm/mod or sm/mod (probably the
former, see Mixed precision).