e.addReferenceInstruction(NEW, "java/lang/StringBuffer");
e.addNoArgInstruction(DUP);
e.addMemberAccessInstruction(INVOKESPECIAL, "java/lang/StringBuffer",
"<init>", "()V");
e.addLDCInstruction("Invalid number ");
e.addMemberAccessInstruction(INVOKEVIRTUAL, "java/lang/StringBuffer",
"append", "(Ljava/lang/String;)Ljava/lang/StringBuffer;");
e.addNoArgInstruction(ALOAD_0);
e.addNoArgInstruction(ICONST_0);
e.addNoArgInstruction(AALOAD);
e.addMemberAccessInstruction(INVOKEVIRTUAL, "java/lang/StringBuffer",