log(-<realnumber>) now returns a real number

[ginac.git] / check / exam_differentiation.cpp

diff --git a/check/exam_differentiation.cpp b/check/exam_differentiation.cpp
index 33b13b1f05d3ccee9e82094d9425fc88b8505a23..ccb97dab9a8926c55598585ffd683ec5ffb36028 100644 (file)
--- a/check/exam_differentiation.cpp
+++ b/check/exam_differentiation.cpp
@@ -3,7 +3,7 @@
  *  Tests for symbolic differentiation, including various functions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2004 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -26,7 +26,7 @@ static unsigned check_diff(const ex &e, const symbol &x,
                                                   const ex &d, unsigned nth=1)
 {
        ex ed = e.diff(x, nth);
-       if ((ed - d).compare(ex(0)) != 0) {
+       if (!(ed - d).is_zero()) {
                switch (nth) {
                case 0:
                        clog << "zeroth ";
@@ -223,7 +223,7 @@ static unsigned exam_differentiation6()
        ed = series_to_poly(ed);
        d = series_to_poly(d);
        
-       if ((ed - d).compare(ex(0)) != 0) {
+       if (!(ed - d).is_zero()) {
                clog << "derivative of " << e << " by " << x << " returned "
                     << ed << " instead of " << d << ")" << endl;
                return 1;