From b95ab24f367baf928332dc5040ab444c1c719623 Mon Sep 17 00:00:00 2001
From: Bruce Wells <brucekwells@gmail.com>
Date: Tue, 19 May 2020 22:36:55 -0400
Subject: setDivisionByZeroIsZero

---
 src/NXP/MathExecutor.php | 16 ++++++++++++++++
 tests/MathTest.php       |  9 ++-------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/src/NXP/MathExecutor.php b/src/NXP/MathExecutor.php
index 0b7e9db..e214209 100644
--- a/src/NXP/MathExecutor.php
+++ b/src/NXP/MathExecutor.php
@@ -468,6 +468,22 @@ class MathExecutor
         return $this->tokenFactory->getFunctions();
     }
 
+    /**
+     * Set division by zero returns zero instead of throwing DivisionByZeroException
+     *
+     * @return MathExecutor
+     */
+    public function setDivisionByZeroIsZero() : self
+    {
+        $this->addOperator(new Operator("/", false, 180, function ($a, $b) {
+            if ($b == 0) {
+                return 0;
+            }
+            return $a / $b;
+        }));
+        return $this;
+    }
+
     public function __clone()
     {
         $this->addDefaults();
diff --git a/tests/MathTest.php b/tests/MathTest.php
index 958f14c..39ac649 100644
--- a/tests/MathTest.php
+++ b/tests/MathTest.php
@@ -203,7 +203,7 @@ class MathTest extends TestCase
             ['(-3 * -1)'],
             ['1 + (-3 * -1)'],
             ['1 + ( -3 * 1)'],
-            ['1 + (3 * -1)'],
+            ['1 + (3 *-1)'],
             ['1 - 0'],
             ['1-0'],
         ];
@@ -226,12 +226,7 @@ class MathTest extends TestCase
     public function testZeroDivision()
     {
         $calculator = new MathExecutor();
-        $calculator->addOperator(new Operator("/", false, 180, function ($a, $b) {
-            if ($b == 0) {
-                return 0;
-            }
-            return $a / $b;
-        }));
+        $calculator->setDivisionByZeroIsZero();
         $this->assertEquals(0, $calculator->execute('10 / 0'));
     }
 
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