X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Fexam_differentiation.cpp;h=8f739ff448a1b1b297458bdb163f4c98c53b1828;hp=33b13b1f05d3ccee9e82094d9425fc88b8505a23;hb=8247d44aac20d266d1b135468dacf521ea655f20;hpb=68fdf425abf14d016d5f95ee7b9d06a19a3c5926

diff --git a/check/exam_differentiation.cpp b/check/exam_differentiation.cpp
index 33b13b1f..8f739ff4 100644
--- a/check/exam_differentiation.cpp
+++ b/check/exam_differentiation.cpp
@@ -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;