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21 lines
496 B
Plaintext
21 lines
496 B
Plaintext
theory HSV_tasks_2019 imports Main begin
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datatype "circuit" =
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NOT "circuit"
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| AND "circuit" "circuit"
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| OR "circuit" "circuit"
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| TRUE
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| FALSE
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| INPUT "int"
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section \<open>Starting point for Task 8\<close>
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text \<open>The following function calculates the area of a circuit (i.e. number of gates).\<close>
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fun area :: "circuit \<Rightarrow> nat" where
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"area (NOT c) = 1 + area c"
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| "area (AND c1 c2) = 1 + area c1 + area c2"
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| "area (OR c1 c2) = 1 + area c1 + area c2"
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| "area _ = 0"
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end |