You could call the predefined functions Lo and Hi for the same purpose, but a variable typecast has the advantage that it can be used on the left side of an assignment statement.
The four parameters that the are the resource record type(RR), the left hand side of the RR, the right hand side of the RR and the ttl that should be applied to the record.
The installation of a PTR record is similar to installing an A RR except that the left hand side of the record is the leased address, reversed, with". in-addr. arpa" concatenated.
When the left-hand side is a subscripted element of an undeclared Maxima array, the right-hand side is assigned to that element, if it already exists, or a new element is allocated, if it does not already exist.
Briefly, the left hand side represents the energy input into the car(batteries and power from the sun) and the right hand side is the energy needed to drive the car along the race route(overcoming rolling resistance, aerodynamic drag, going uphill and accelerating).
キー:セッティング式の左辺項。
Key: Left hand side of a setting expression.
左辺項をキー(key)という。
Left-hand side is a key.
と<*は左辺項か右辺項のみ返すバリエーションだ。
And<* are variations that returns only the rhs or lhs.
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