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diff --git a/src/util/rational_cln_imp.cpp b/src/util/rational_cln_imp.cpp
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+/*********************                                                        */
+/*! \file rational_cln_imp.cpp
+ ** \verbatim
+ ** Original author: taking
+ ** Major contributors: mdeters, cconway
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief A multi-precision rational constant.
+ **
+ ** A multi-precision rational constant.
+ **/
+
+#ifdef __CVC4__USE_CLN_IMP
+
+
+#include "util/integer.h"
+#include "util/rational.h"
+#include <string>
+
+using namespace std;
+using namespace CVC4;
+
+/* Computes a rational given a decimal string. The rational
+ * version of <code>xxx.yyy</code> is <code>xxxyyy/(10^3)</code>.
+ */
+Rational Rational::fromDecimal(const string& dec) {
+  // Find the decimal point, if there is one
+  string::size_type i( dec.find(".") );
+  if( i != string::npos ) {
+    /* Erase the decimal point, so we have just the numerator. */
+    Integer numerator( string(dec).erase(i,1) );
+
+    /* Compute the denominator: 10 raise to the number of decimal places */
+    int decPlaces = dec.size() - (i + 1);
+    Integer denominator( Integer(10).pow(decPlaces) );
+
+    return Rational( numerator, denominator );
+  } else {
+    /* No decimal point, assume it's just an integer. */
+    return Rational( dec );
+  }
+}
+
+std::ostream& CVC4::operator<<(std::ostream& os, const Rational& q){
+  return os << q.toString();
+}
+
+#endif /* __CVC4__USE_CLN_IMP */