diff --git a/sources/zweic/Operators.scala b/sources/zweic/Operators.scala
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+++ b/sources/zweic/Operators.scala
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+/*  zweic -- a compiler for zwei
+ *
+ *  Stephane Micheloud & LAMP
+ *
+ *  $Id$
+ */
+
+package zweic;
+
+
+/**
+ * This class defines all binary operators of zwei.
+ */
+object Operators extends Enumeration {
+  type Operator = Value;
+
+  // binary
+  val ADD = Value("+");
+  val SUB = Value("-");
+  val MUL = Value("*");
+  val DIV = Value("/");
+  val MOD = Value("%");
+  val EQ  = Value("==");
+  val NE  = Value("!=");
+  val LT  = Value("<");
+  val LE  = Value("<=");
+  val GT  = Value(">");
+  val GE  = Value(">=");
+  val AND = Value("&&");
+
+  // unary
+  val NEG = Value("-");
+  val NOT = Value("!");
+
+  import scala.collection.mutable.HashMap;
+
+  val token2op = new HashMap[Tokens.Token, Operator]();
+
+  token2op += Tokens.ADD -> ADD;
+  token2op += Tokens.SUB -> SUB;
+  token2op += Tokens.MUL -> MUL;
+  token2op += Tokens.DIV -> DIV;
+  token2op += Tokens.MOD -> MOD;
+  token2op += Tokens.EQ  -> EQ;
+  token2op += Tokens.NE  -> NE;
+  token2op += Tokens.LT  -> LT;
+  token2op += Tokens.LE  -> LE;
+  token2op += Tokens.GT  -> GT;
+  token2op += Tokens.GE  -> GE;
+  token2op += Tokens.AND -> AND;
+  token2op += Tokens.NOT -> NOT;
+}