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diff --git a/gmp/demos/expr/exprf.c b/gmp/demos/expr/exprf.c
new file mode 100644
index 00000000..c67ee517
--- /dev/null
+++ b/gmp/demos/expr/exprf.c
@@ -0,0 +1,127 @@
+/* mpf expression evaluation
+
+Copyright 2000, 2001, 2002 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 <string.h>
+#include "gmp.h"
+#include "expr-impl.h"
+
+
+/* Change this to "#define TRACE(x) x" to get some traces. */
+#define TRACE(x)
+
+
+static int
+e_mpf_sgn (mpf_srcptr x)
+{
+  return mpf_sgn (x);
+}
+
+
+static __gmp_const struct mpexpr_operator_t  _mpf_expr_standard_table[] = {
+
+  { "**",  (mpexpr_fun_t) mpf_pow_ui,
+    MPEXPR_TYPE_BINARY_UI | MPEXPR_TYPE_RIGHTASSOC,                   220 },
+
+  { "!",   (mpexpr_fun_t) e_mpf_sgn,
+    MPEXPR_TYPE_LOGICAL_NOT | MPEXPR_TYPE_PREFIX,                     210 },
+  { "-",   (mpexpr_fun_t) mpf_neg,
+    MPEXPR_TYPE_UNARY | MPEXPR_TYPE_PREFIX,                           210 },
+
+  { "*",   (mpexpr_fun_t) mpf_mul,           MPEXPR_TYPE_BINARY,      200 },
+  { "/",   (mpexpr_fun_t) mpf_div,           MPEXPR_TYPE_BINARY,      200 },
+
+  { "+",   (mpexpr_fun_t) mpf_add,           MPEXPR_TYPE_BINARY,      190 },
+  { "-",   (mpexpr_fun_t) mpf_sub,           MPEXPR_TYPE_BINARY,      190 },
+
+  { "<<",  (mpexpr_fun_t) mpf_mul_2exp,      MPEXPR_TYPE_BINARY_UI,   180 },
+  { ">>",  (mpexpr_fun_t) mpf_div_2exp,      MPEXPR_TYPE_BINARY_UI,   180 },
+
+  { "<=",  (mpexpr_fun_t) mpf_cmp,           MPEXPR_TYPE_CMP_LE,      170 },
+  { "<",   (mpexpr_fun_t) mpf_cmp,           MPEXPR_TYPE_CMP_LT,      170 },
+  { ">=",  (mpexpr_fun_t) mpf_cmp,           MPEXPR_TYPE_CMP_GE,      170 },
+  { ">",   (mpexpr_fun_t) mpf_cmp,           MPEXPR_TYPE_CMP_GT,      170 },
+
+  { "==",  (mpexpr_fun_t) mpf_cmp,           MPEXPR_TYPE_CMP_EQ,      160 },
+  { "!=",  (mpexpr_fun_t) mpf_cmp,           MPEXPR_TYPE_CMP_NE,      160 },
+
+  { "&&",  (mpexpr_fun_t) e_mpf_sgn,         MPEXPR_TYPE_LOGICAL_AND, 120 },
+  { "||",  (mpexpr_fun_t) e_mpf_sgn,         MPEXPR_TYPE_LOGICAL_OR,  110 },
+
+  { ":",   NULL,                             MPEXPR_TYPE_COLON,       101 },
+  { "?",   (mpexpr_fun_t) e_mpf_sgn,         MPEXPR_TYPE_QUESTION,    100 },
+
+  { ")",   NULL,                             MPEXPR_TYPE_CLOSEPAREN,    4 },
+  { "(",   NULL,                             MPEXPR_TYPE_OPENPAREN,     3 },
+  { ",",   NULL,                             MPEXPR_TYPE_ARGSEP,        2 },
+  { "$",   NULL,                             MPEXPR_TYPE_VARIABLE,      1 },
+
+  { "abs",      (mpexpr_fun_t) mpf_abs,          MPEXPR_TYPE_UNARY        },
+  { "ceil",     (mpexpr_fun_t) mpf_ceil,         MPEXPR_TYPE_UNARY        },
+  { "cmp",      (mpexpr_fun_t) mpf_cmp,          MPEXPR_TYPE_I_BINARY     },
+  { "eq",       (mpexpr_fun_t) mpf_eq,           MPEXPR_TYPE_I_TERNARY_UI },
+  { "floor",    (mpexpr_fun_t) mpf_floor,        MPEXPR_TYPE_UNARY        },
+  { "integer_p",(mpexpr_fun_t) mpf_integer_p,    MPEXPR_TYPE_I_UNARY      },
+  { "max",   (mpexpr_fun_t) mpf_cmp, MPEXPR_TYPE_MAX | MPEXPR_TYPE_PAIRWISE },
+  { "min",   (mpexpr_fun_t) mpf_cmp, MPEXPR_TYPE_MIN | MPEXPR_TYPE_PAIRWISE },
+  { "reldiff",  (mpexpr_fun_t) mpf_reldiff,      MPEXPR_TYPE_BINARY       },
+  { "sgn",      (mpexpr_fun_t) e_mpf_sgn,        MPEXPR_TYPE_I_UNARY      },
+  { "sqrt",     (mpexpr_fun_t) mpf_sqrt,         MPEXPR_TYPE_UNARY        },
+  { "trunc",    (mpexpr_fun_t) mpf_trunc,        MPEXPR_TYPE_UNARY        },
+
+  { NULL }
+};
+
+__gmp_const struct mpexpr_operator_t * __gmp_const mpf_expr_standard_table
+= _mpf_expr_standard_table;
+
+
+int
+#if HAVE_STDARG
+mpf_expr (mpf_ptr res, int base, __gmp_const char *e, ...)
+#else
+mpf_expr (va_alist)
+     va_dcl
+#endif
+{
+  mpf_srcptr  var[MPEXPR_VARIABLES];
+  va_list     ap;
+  int         ret;
+#if HAVE_STDARG
+  va_start (ap, e);
+#else
+  mpf_ptr           res;
+  int               base;
+  __gmp_const char  *e;
+  va_start (ap);
+  res  = va_arg (ap, mpf_ptr);
+  base = va_arg (ap, int);
+  e    = va_arg (ap, __gmp_const char *);
+#endif
+
+  TRACE (printf ("mpf_expr(): base %d, %s\n", base, e));
+  ret = mpexpr_va_to_var ((void **) var, ap);
+  va_end (ap);
+
+  if (ret != MPEXPR_RESULT_OK)
+    return ret;
+
+  return mpf_expr_a (mpf_expr_standard_table, res, base,
+		     mpf_get_prec (res), e, strlen(e), var);
+}