better build

build.sh

@@ -8,5 +8,5 @@ else
 	ls -lah bin/$1.class
 	echo -e "executing ================================================\n"
 	cd bin
-	java $1
+	java $1 "${@:2}" # the first arg is what java should do, the other are args
 fi

src/Factorial.jas

@@ -9,9 +9,10 @@
 
 .method public static factorial(I)I ; calc `given`!
     .limit locals 3
-    .limit stack  5
-    bipush 1 ;
-    istore 0 ; store the parameter `given`
+    .limit stack  2
+    ; note that parameters are automatically stored as
+    ; local variables, we dont need to do `istore 0` to
+    ; store the given integer in a local variable.
     bipush 1 ; we start calculating with `p`=1
     istore 1 ; store `p`
     bipush 2 ; we start calculating with `j`=1
@@ -43,11 +44,25 @@
 .end method
 
 .method public static main([Ljava/lang/String;)V
-    .limit locals   1
-    .limit stack    2
-    getstatic       java/lang/System/out Ljava/io/PrintStream;
-    bipush 5                                ; set parameter 1
+    .limit locals   3
+    .limit stack    4
+    ; parse cli args to int
+    aload 0
+    aaload 0
+    invokestatic    java/lang/Integer/parseInt(Ljava/lang/String;)I
+    istore 1
+
+    ; format
+    iload 1
+    ldc "! = "
+    iload 1
     invokestatic    Factorial/factorial(I)I ; call factorial
-    invokevirtual   java/io/PrintStream/println(I)V 
+    invokevirtual   java/lang/String/format(ILjava/lang/String;I)I
+    astore 2
+
+    ; output
+    getstatic       java/lang/System/out Ljava/io/PrintStream;
+    aload 2         ; load formatted str
+    invokevirtual   java/io/PrintStream/println(Ljava/lang/String;)V 
     return
 .end method