Homework_2-sol

# Homework_2-sol - Homework 2 Due on Monday April 7th before...

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Homework 2 – Due on Monday April 7 th before class CSC122 Spring 08 1. Explain what the following Haskell function does in one clear sentence. mystery([],[]) = 0; mystery([],[h:t]) = 0; mystery([h:t],[]) = 0; mystery([h1:t1],[h2:t2]) = if (h1==h2) then 1+mystery(t1,t2) else mystery(t1,t2); counts the number of elements that are the same in the same spots in both lists. 2. Write a Haskell function CountThem(x,l) that counts the number of occurrences of the symbol x in the list l. e.g. CountThem( 'A ' ,[‘A’,’ B’,’ A’,’ B’] ) is 2 countThem(item,[]) = 0; countThem(item, [x:xs]) = if(x==item) then 1+countThem(item, xs) else countThem(item, xs); 3. Write a HasCl function called declist that takes one parameter (a list of numbers). The function should return a list of numbers with each number one less that the corresponding number in the original list. For example, declist( [1, 2, 3, 4] ) should return [0, 1, 2, 3]. declist([]) = []; declist([x]) = [x-1]; declist([x:xs]) = [x-1: declist(xs)]; 4. What is the output of calling the method test( ) in the following Java code?

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