diff -r a9911966c0df -r 43c0ed473720 progs/compile.scala
--- a/progs/compile.scala	Tue Nov 10 22:27:46 2015 +0000
+++ b/progs/compile.scala	Sun Nov 15 21:31:31 2015 +0000
@@ -111,9 +111,13 @@
 def compile_aexp(a: AExp, env : Env) : Instrs = a match {
   case Num(i) => List("ldc " + i.toString + "\n")
   case Var(s) => List("iload " + env(s) + "\n")
-  case Aop("+", a1, a2) => compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("iadd\n")
-  case Aop("-", a1, a2) => compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("isub\n")
-  case Aop("*", a1, a2) => compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("imul\n")
+  case Aop("+", a1, a2) => 
+    compile_aexp(a1, env) ++ 
+    compile_aexp(a2, env) ++ List("iadd\n")
+  case Aop("-", a1, a2) => 
+    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("isub\n")
+  case Aop("*", a1, a2) => 
+    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("imul\n")
 }
 
 // boolean expression compilation
@@ -121,18 +125,22 @@
   case True => Nil
   case False => List("goto " + jmp + "\n")
   case Bop("=", a1, a2) => 
-    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("if_icmpne " + jmp + "\n")
+    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ 
+    List("if_icmpne " + jmp + "\n")
   case Bop("!=", a1, a2) => 
-    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("if_icmpeq " + jmp + "\n")
+    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ 
+    List("if_icmpeq " + jmp + "\n")
   case Bop("<", a1, a2) => 
-    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ List("if_icmpge " + jmp + "\n")
+    compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ 
+    List("if_icmpge " + jmp + "\n")
 }
 
 // statement compilation
 def compile_stmt(s: Stmt, env: Env) : (Instrs, Env) = s match {
   case Skip => (Nil, env)
   case Assign(x, a) => {
-    val index = if (env.isDefinedAt(x)) env(x) else env.keys.size.toString
+    val index = if (env.isDefinedAt(x)) env(x) else 
+                    env.keys.size.toString
     (compile_aexp(a, env) ++ 
      List("istore " + index + "\n"), env + (x -> index))
   } 
@@ -159,9 +167,11 @@
      List("\n" + loop_end + ":\n\n"), env1)
   }
   case Write(x) => 
-    (List("iload " + env(x) + "\n" + "invokestatic XXX/XXX/write(I)V\n"), env)
+    (List("iload " + env(x) + "\n" + 
+           "invokestatic XXX/XXX/write(I)V\n"), env)
   case Read(x) => {
-    val index = if (env.isDefinedAt(x)) env(x) else env.keys.size.toString
+    val index = if (env.isDefinedAt(x)) env(x) else 
+                    env.keys.size.toString
     (List("invokestatic XXX/XXX/read()I\n" + 
           "istore " + index + "\n"), env + (x -> index))
   }
@@ -191,10 +201,11 @@
        Assign("minus2",Num(1)),         //  minus2 := 1;
        Assign("temp",Num(0)),           //  temp := 0;
        While(Bop("<",Num(0),Var("n")),  //  while n > 0 do  {
-          List(Assign("temp",Var("minus2")),                          //  temp := minus2;
-               Assign("minus2",Aop("+",Var("minus1"),Var("minus2"))), //  minus2 := minus1 + minus2;
-               Assign("minus1",Var("temp")),                          //  minus1 := temp;
-               Assign("n",Aop("-",Var("n"),Num(1))))),                //  n := n - 1 };
+          List(Assign("temp",Var("minus2")),    //  temp := minus2;
+               Assign("minus2",Aop("+",Var("minus1"),Var("minus2"))), 
+                                        //  minus2 := minus1 + minus2;
+               Assign("minus1",Var("temp")), //  minus1 := temp;
+               Assign("n",Aop("-",Var("n"),Num(1))))), //  n := n - 1 };
        Write("minus1"))                 //  write minus1