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Write a function named contains-double in Scheme that takes a list as input and returns true if an item every appears twice in a row. You may assume the list is flat (i.e., no nested lists). For example, • (contains-double • (contains-double • (contains-double (contains-double ● (contains-double '(a b c 1 2)) should return false '(a b c 1 a)) should return false '(a b b c 1 a)) should return true '()) should return false '(5)) should return false

Write a function named contains-double in Scheme that takes a list as input and returns true if an item every appears twice in a row. You may assume the list is flat (i.e., no nested lists). For example, • (contains-double • (contains-double • (contains-double (contains-double ● (contains-double '(a b c 1 2)) should return false '(a b c 1 a)) should return false '(a b b c 1 a)) should return true '()) should return false '(5)) should return false

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Write a function named contains-double in Scheme that takes a list as input and returns true if an item every appears twice in a row. You may assume the list is flat (i.e., no nested lists).

 

Write a function named contains-double in Scheme that takes a list as input and returns true if an item every appears twice in a row. You may assume the list is flat (i.e., no nested lists). For example, • (contains-double '(a b c 1 2)) should return false • (contains-double '(a b c 1 a)) should return false • (contains-double • (contains-double • (contains-double '(a b b c 1 a)) should return true '()) should return false (5)) should return false
Transcribed Image Text:Write a function named contains-double in Scheme that takes a list as input and returns true if an item every appears twice in a row. You may assume the list is flat (i.e., no nested lists). For example, • (contains-double '(a b c 1 2)) should return false • (contains-double '(a b c 1 a)) should return false • (contains-double • (contains-double • (contains-double '(a b b c 1 a)) should return true '()) should return false (5)) should return false
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