Check to see if the argument of tangent divided by half pi is an odd integer. If so, throw an out of domain error.

2011-11-12 17:20:09 -05:00
parent 6c6edebce8
commit 0f27a79e43
1 changed files with 3 additions and 0 deletions
@@ -652,6 +652,9 @@ ExpressionParser::_ParseFunction(const Token& token)
 		return _ParseFactorial(values[0].sqrt());
 	} else if (strcasecmp("tan", token.string.String()) == 0) {
 		_InitArguments(values, 1);
+		MAPM divided_by_half_pi = values[0] / MM_HALF_PI;
+		if (divided_by_half_pi.is_integer() && divided_by_half_pi.is_odd())
+			throw ParseException("out of domain", token.position);
 		return _ParseFactorial(values[0].tan());
 	} else if (strcasecmp("tanh", token.string.String()) == 0) {
 		_InitArguments(values, 1);