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diff --git a/gmp/demos/expr/exprqa.c b/gmp/demos/expr/exprqa.c
new file mode 100644
index 00000000..c56f1ca6
--- /dev/null
+++ b/gmp/demos/expr/exprqa.c
@@ -0,0 +1,89 @@
+/* mpq expression evaluation
+
+Copyright 2000, 2001, 2004 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+
+#include <stdio.h>
+#include "gmp.h"
+#include "expr-impl.h"
+
+
+static int
+e_mpq_ulong_p (mpq_srcptr q)
+{
+  return mpz_fits_ulong_p (mpq_numref (q))
+    && mpz_cmp_ui (mpq_denref (q), 1L) == 0;
+}
+
+/* get value as a ui, on the assumption it fits */
+static int
+e_mpq_get_ui_fits (mpq_srcptr q)
+{
+  return mpz_get_ui (mpq_numref (q));
+}
+
+static void
+e_mpq_set_si1 (mpq_ptr q, long num)
+{
+  mpq_set_si (q, num, 1L);
+}
+
+/* The same as mpz, but putting the result in the numerator.  Negatives and
+   fractions aren't parsed here because '-' and '/' are operators. */
+static size_t
+e_mpq_number (mpq_ptr res, __gmp_const char *e, size_t elen, int base)
+{
+  mpz_set_ui (mpq_denref (res), 1L);
+  return mpexpr_mpz_number (mpq_numref (res), e, elen, base);
+}
+
+
+/* ignoring prec */
+static void
+e_mpq_init (mpq_ptr q, unsigned long prec)
+{
+  mpq_init (q);
+}
+
+int
+mpq_expr_a (__gmp_const struct mpexpr_operator_t *table,
+            mpq_ptr res, int base,
+            __gmp_const char *e, size_t elen,
+            mpq_srcptr var[26])
+{
+  struct mpexpr_parse_t  p;
+
+  p.table = table;
+  p.res = (mpX_ptr) res;
+  p.base = base;
+  p.e = e;
+  p.elen = elen;
+  p.var = (mpX_srcptr *) var;
+
+  p.mpX_clear       = (mpexpr_fun_one_t)      mpq_clear;
+  p.mpX_ulong_p     = (mpexpr_fun_i_unary_t)  e_mpq_ulong_p;
+  p.mpX_get_ui      = (mpexpr_fun_get_ui_t)   e_mpq_get_ui_fits;
+  p.mpX_init        = (mpexpr_fun_unary_ui_t) e_mpq_init;
+  p.mpX_number      = (mpexpr_fun_number_t)   e_mpq_number;
+  p.mpX_set         = (mpexpr_fun_unary_t)    mpq_set;
+  p.mpX_set_or_swap = (mpexpr_fun_unary_t)    mpq_swap;
+  p.mpX_set_si      = (mpexpr_fun_set_si_t)   e_mpq_set_si1;
+  p.mpX_swap        = (mpexpr_fun_swap_t)     mpq_swap;
+
+  return mpexpr_evaluate (&p);
+}