From a0b3e97d555ee504636c06fd3a72983b95c3bfb6 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Fri, 26 Sep 2014 22:51:49 +0200
Subject: Eliminated manual division through zero prevention * while integer
 division through zero is obviously a low level error that should be
 prevented, this operation is well-defined for floating point values as used
 by SimpleParser

---
 src/exceptions.h |  7 -------
 src/nodes.cc     | 18 ++++++------------
 2 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/src/exceptions.h b/src/exceptions.h
index b17f424..1408603 100644
--- a/src/exceptions.h
+++ b/src/exceptions.h
@@ -17,13 +17,6 @@ class operator_exception: public std::exception {
 	}
 };
 
-class divide_exception: public std::exception {
-	virtual const char* what() const throw()
-	{
-		return "A divison through zero had to be prevented by the parser - check your input term.";
-	}
-};
-
 class identifier_exception: public std::exception {
 	virtual const char* what() const throw()
 	{
diff --git a/src/nodes.cc b/src/nodes.cc
index 283b583..256a609 100644
--- a/src/nodes.cc
+++ b/src/nodes.cc
@@ -30,29 +30,23 @@ OperatorNode::OperatorNode(TokenType token):
 
 double OperatorNode::solve() const {
 	switch ( this->operator_ ) {
-		case TokenType::OPERATOR_MULTIPLY: {
-			return this->leftChild->solve() * this->rightChild->solve();
-		}
 		case TokenType::OPERATOR_PLUS: {
 			return this->leftChild->solve() + this->rightChild->solve();
 		}
 		case TokenType::OPERATOR_MINUS: {
 			return this->leftChild->solve() - this->rightChild->solve();
 		}
+		case TokenType::OPERATOR_MULTIPLY: {
+			return this->leftChild->solve() * this->rightChild->solve();
+		}
+		case TokenType::OPERATOR_DIVIDE: {
+			return this->leftChild->solve() / this->rightChild->solve();
+		}
 		case TokenType::OPERATOR_POWER: {
 			return std::pow(
 				this->leftChild->solve(), this->rightChild->solve()
 			);
 		}
-		case TokenType::OPERATOR_DIVIDE: {
-			const double rightChild{ this->rightChild->solve() };
-			
-			if ( rightChild != 0 ) {
-				return this->leftChild->solve() / rightChild;
-			} else {
-				throw divide_exception();
-			}
-		}
 		default: {
 			throw operator_exception();
 		}
-- 
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