Merge pull request azdanov#12 from fathom/master

added int2 and string5 functions to Reverse and test cases

Author: azdanov

exercises/Reverse/Complete/ReverseComplete.php

@@ -42,11 +42,41 @@ public static function string4(string $string): string
         });
     }
 
+    public static function string5(string $string): string
+    {
+        $revers = '';
+
+        for ($i = mb_strlen($string); $i >= 0; $i--) {
+            $revers .= mb_substr($string, $i, 1);
+        }
+
+        return $revers;
+    }
+
     public static function int(int $number): int
     {
         /** @see https://wiki.php.net/rfc/combined-comparison-operator */
         $sign = $number <=> 0;
 
         return $sign * (int) strrev((string) $number);
     }
+
+    public static function int2(int $number): int
+    {
+        $revers = 0;
+
+        $sing = $number <=> 0;
+        $number = abs($number);
+
+        $n = (int) log10($number) + 1;
+
+        for ($i = 1; $i <= $n; $i++) {
+            $pow = pow(10, $n - $i);
+            $numeral = (int) ($number / $pow);
+            $number -= $numeral * $pow;
+            $revers += $numeral * pow(10, $i - 1);
+        }
+
+        return $revers * $sing;
+    }
 }

tests/Reverse/Complete/ReverseCompleteTest.php

@@ -39,6 +39,36 @@ public function testCanReverseIntNegativeWithZeros(): void
         self::assertSame(-21, ReverseComplete::int(-120));
     }
 
+    public function testCanReverseIntZero2(): void
+    {
+        self::assertSame(0, ReverseComplete::int2(0));
+    }
+
+    public function testCanReverseInt2(): void
+    {
+        self::assertSame(21, ReverseComplete::int2(12));
+    }
+
+    public function testCanReverseIntWithThreeDigits2(): void
+    {
+        self::assertSame(321, ReverseComplete::int2(123));
+    }
+
+    public function testCanReverseIntZeros2(): void
+    {
+        self::assertSame(3, ReverseComplete::int2(300));
+    }
+
+    public function testCanReverseIntNegative2(): void
+    {
+        self::assertSame(-21, ReverseComplete::int2(-12));
+    }
+
+    public function testCanReverseIntNegativeWithZeros2(): void
+    {
+        self::assertSame(-21, ReverseComplete::int2(-120));
+    }
+
     public function testCanReverseString1(): void
     {
         self::assertSame('ytrewq', ReverseComplete::string1('qwerty'));
@@ -78,4 +108,14 @@ public function testCanReverseStringWithWhitespace4(): void
     {
         self::assertSame('ytr ewq ', ReverseComplete::string4(' qwe rty'));
     }
+
+    public function testCanReverseString5(): void
+    {
+        self::assertSame('ytrewq', ReverseComplete::string5('qwerty'));
+    }
+
+    public function testCanReverseStringWithWhitespace5(): void
+    {
+        self::assertSame('ytr ewq ', ReverseComplete::string5(' qwe rty'));
+    }
 }