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projects/09/HelloWorld/Main.jack

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/09/HelloWorld/Main.jack
+
+/** Hello World program. */
+class Main {
+   function void main() {
+      /* Prints some text using the standard library. */
+      do Output.printString("Hello world!");
+      do Output.println();      // New line
+      return;
+   }
+}