+= lx01

Author: wakita

build.sbt

@@ -37,6 +37,8 @@ lazy val common = Seq(
   version := "0.1.0"
 )
 
+lazy val lx01 = project.settings(common)
+
 val lx02 = "lx02/lx02"
 lazy val lx02a = (project in file(lx02 + "a")).settings(common)
 lazy val lx02b = (project in file(lx02 + "b")).settings(common)

lx01/src/Makefile

@@ -0,0 +1,22 @@
+all: simple simple.s Simple.class
+
+simple: simple.c
+	clang -o simple simple.c
+
+simple.s: simple.c
+	clang -O0 -S simple.c
+
+Simple.class: simple.scala
+	scalac simple.scala
+
+clean:
+	rm -f simple simple.s *.class
+
+run-c: simple
+	./simple
+
+run-s: Simple.class
+	scala Simple
+
+run-j: Simple.class
+	java -classpath `brew --prefix`/opt/scala/libexec/lib/scala-library.jar:. Simple

lx01/src/simple.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int simple(int a, int n) {
+  for (int i = 1; i <= n; i++) {
+    a = a + i;
+  }
+  return a;
+}
+
+int main() {
+  printf("1 + 2 + ... + 10 = %d\n", simple(0, 10));
+}

lx01/src/simple.scala

@@ -0,0 +1,12 @@
+object Simple {
+  def simple(a: Int, n: Int): Int = {
+    def aux(a: Int, i: Int): Int = {
+      if (i > n) a else aux(a + i, i + 1)
+    }
+    aux(a, 1);
+  }
+
+  def main(arguments: Array[String]) {
+    println("1 + 2 + ... + 10 = " + simple(0, 10))
+  }
+}