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doc-src/Tutorial/Datatype/abevala
author nipkow
Thu, 12 Nov 1998 16:45:40 +0100
changeset 5851 15ce4c1c8313
permissions -rw-r--r--
New section on advanced datatypes.
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primrec
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  "evala env (IF b a1 a2) =
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     (if evalb env b then evala env a1 else evala env a2)"
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  "evala env (Sum a1 a2) = evala env a1 + evala env a2"
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  "evala env (Diff a1 a2) = evala env a1 - evala env a2"
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  "evala env (Var v) = env v"
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  "evala env (Num n) = n"
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