(main): Handle "negative" base in mpz_sizeinbase call.

1 files changed, 2 insertions, 1 deletions

diff --git a/demos/pexpr.c b/demos/pexpr.c
index d03d5ce39..5e863342f 100644
--- a/demos/pexpr.c
+++ b/demos/pexpr.c
@@ -469,7 +469,8 @@ main (int argc, char **argv)
       else
 	{
 	  printf ("result is approximately %ld digits%s\n",
-		  (long) mpz_sizeinbase (r, 10), newline);
+		  (long) mpz_sizeinbase (r, base >= 0 ? base : -base),
+		  newline);
 	}
 
       free_expr (e);