Add Odd and Even Check Functions (#165)

* Add CheckOdd and CheckEven functions

* code style improved

* code corrected

DIRECTORY.md

@@ -46,8 +46,10 @@
   * [Absolutemin](./Maths/AbsoluteMin.php)
   * [Armstrongnumber](./Maths/ArmstrongNumber.php)
   * [Basex](./Maths/BaseX.php)
+  * [CheckEven](./Maths/CheckEven.php)
   * [Checkpalindrome](./Maths/CheckPalindrome.php)
   * [Checkprime](./Maths/CheckPrime.php)
+  * [CheckOdd](./Maths/CheckOdd.php)
   * [Eratosthenessieve](./Maths/EratosthenesSieve.php)
   * [Factorial](./Maths/Factorial.php)
   * [Fastexponentiation](./Maths/FastExponentiation.php)

Maths/CheckEven.php

@@ -0,0 +1,13 @@
+<?php
+
+/**
+ * This function checks whether
+ * the provided integer is even.
+ *
+ * @param int $number An integer input
+ * @return bool whether the number is even or not
+ */
+function isEven(int $number): bool
+{
+    return $number % 2 === 0;
+}

Maths/CheckOdd.php

@@ -0,0 +1,13 @@
+<?php
+
+/**
+ * This function checks whether
+ * the provided integer is odd.
+ *
+ * @param int $number An integer input
+ * @return bool whether the number is odd or not
+ */
+function isOdd(int $number): bool
+{
+    return $number % 2 !== 0;
+}

tests/Maths/MathsTest.php

@@ -6,8 +6,10 @@
 require_once __DIR__ . '/../../Maths/AbsoluteMax.php';
 require_once __DIR__ . '/../../Maths/ArmstrongNumber.php';
 require_once __DIR__ . '/../../Maths/AbsoluteMin.php';
+require_once __DIR__ . '/../../Maths/CheckEven.php';
 require_once __DIR__ . '/../../Maths/CheckPalindrome.php';
 require_once __DIR__ . '/../../Maths/CheckPrime.php';
+require_once __DIR__ . '/../../Maths/CheckOdd.php';
 require_once __DIR__ . '/../../Maths/Factorial.php';
 require_once __DIR__ . '/../../Maths/FastExponentiation.php';
 require_once __DIR__ . '/../../Maths/Fibonacci.php';
@@ -40,6 +42,15 @@ public function testFactorial()
         factorial(-25);
     }
 
+    public function testIsEven()
+    {
+        $this->assertTrue(isEven(2));
+        $this->assertTrue(isEven(0));
+        $this->assertFalse(isEven(3));
+        $this->assertFalse(isEven(17));
+        $this->assertTrue(isEven(-4));
+    }
+
     public function testIsNumberArmstrong()
     {
         $this->assertTrue(isNumberArmstrong(153));
@@ -56,6 +67,15 @@ public function testIsNumberPalindromic()
         $this->assertFalse(isNumberPalindromic(2468));
     }
 
+    public function testIsOdd()
+    {
+        $this->assertTrue(isOdd(3));
+        $this->assertTrue(isOdd(17));
+        $this->assertFalse(isOdd(4));
+        $this->assertFalse(isOdd(0));
+        $this->assertTrue(isOdd(-5));
+    }
+
     public function testIsPrime()
     {
         $this->assertTrue(isPrime(73));