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CS220 Programming Principles

CS220 Programming Principles. ?????? ?? 2002 ???? Class 5 ? ??. Remind pairs!. cons : T 1 , T 2 -> T 1 x T 2 car : T 1 x T 2 -> T 1 cdr : T 1 x T 2 -> T 2 (car (cons <v 1 > <V 2 >)) = <V 1 > (cdr (cons <v 1 > <V 2 >)) = <V 2 > (pair? <p>) => #t if <p> is a pair

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