* Added the solutions of 2.1-5.

ch02.tex

@@ -0,0 +1,47 @@
+\chapter{\Large{First Steps}}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\exercise{2.1}
+
+\begin{lstlisting}[language=Haskell,escapeinside=~~]
+(2 ^ 3) * 4
+(2 * 3) + (4 * 5)
+2 + (3 * (4 ^ 5))
+\end{lstlisting}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\exercise{2.2}
+
+(생략)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\exercise{2.3}
+
+주어진 스크립트에는 다음 세가지 문제점이 있다.
+\begin{itemize}
+\item 함수 이름이 소문자로 시작되지 않는다.
+\item 함수를 인자 사이에서 쓰려면 따옴표(\texttt{'})가 아닌
+  역따옴표(\texttt{`})로 묶어야 한다.
+\item \texttt{where} 다음에 오는 문장의 들여쓰기가 일치하지 않는다.
+\end{itemize}
+
+수정된 스크립트는 다음과 같다.
+
+\haskell{./src/ch02-ex03.hs}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\exercise{2.4}
+
+\haskell{./src/ch02-ex04.hs}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\exercise{2.5}
+
+\haskell{./src/ch02-ex05.hs}
+
+
+%%% Local Variables: 
+%%% mode: latex
+%%% TeX-master: "master"
+%%% End: 

master.tex

@@ -56,6 +56,7 @@
 \maketitle
 \tableofcontents
 \input{ch01}
+\input{ch02}
 
 \end{document}
 

src/ch02-ex03.hs

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+n = a `div` length xs
+    where
+      a = 10
+      xs = [1,2,3,4,5]

src/ch02-ex04.hs

@@ -0,0 +1,8 @@
+last1 :: [a] -> a
+last1 xs = head (reverse xs)
+
+last2 :: [a] -> a
+last2 xs = xs !! (length xs - 1)
+
+last3 :: [a] -> a
+last3 xs = head (drop (length xs - 1) xs)

src/ch02-ex05.hs

@@ -0,0 +1,5 @@
+init1 :: [a] -> [a]
+init1 xs = reverse (tail (reverse xs))
+
+init2 :: [a] -> [a]
+init2 xs = take (length xs - 1) xs