return result;
}
+// This one returned 0 because add::normal() incorrectly assumed that if the
+// common denominator is 1, all the denominators would be 1 (they can in fact
+// be +/-1). Fixed on Aug 2nd 2000.
+static unsigned exam_paranoia12(void)
+{
+ unsigned result = 0;
+ symbol x("x");
+
+ ex e = 2-2*(1+x)/(-1-x);
+ ex f = e.normal();
+ ex d = 4;
+
+ if (!(f - d).expand().is_zero()) {
+ clog << "normal(" << e << ") returns " << f << " instead of " << d << endl;
+ ++result;
+ }
+ return result;
+}
+
unsigned exam_paranoia(void)
{
unsigned result = 0;
result += exam_paranoia9(); cout << '.' << flush;
result += exam_paranoia10(); cout << '.' << flush;
result += exam_paranoia11(); cout << '.' << flush;
+ result += exam_paranoia12(); cout << '.' << flush;
if (!result) {
cout << " passed " << endl;