[New Exercise]: Square Root

config.json

@@ -421,6 +421,16 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "square-root",
+        "name": "Square Root",
+        "uuid": "84ab45f7-243e-43ee-bd56-4ac6267f4206",
+        "practices": [
+            "math"
+        ],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "high-scores",
         "name": "High Scores",

exercises/practice/square-root/.docs/instructions.md

@@ -0,0 +1,13 @@
+# Instructions
+
+Given a natural radicand, return its square root.
+
+Note that the term "radicand" refers to the number for which the root is to be determined.
+That is, it is the number under the root symbol.
+
+Check out the Wikipedia pages on [square root][square-root] and [methods of computing square roots][computing-square-roots].
+
+Recall also that natural numbers are positive real whole numbers (i.e. 1, 2, 3 and up).
+
+[square-root]: https://en.wikipedia.org/wiki/Square_root
+[computing-square-roots]: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots

exercises/practice/square-root/.meta/SquareRoot.example.ps1

@@ -0,0 +1,38 @@
+Function Get-SquareRoot() {
+    <#
+    .SYNOPSIS
+    Given a natural radicand, return its square root.
+
+    .DESCRIPTION
+    The function takes a positive integer and return its square root value.
+
+    .PARAMETER Radicand
+    The number to get its square root.
+
+    .EXAMPLE
+    Get-SquareRoot -Radicand 25
+    Retuns: 5
+    #>
+    [CmdletBinding()]
+    Param(
+        [int]$Radicand
+    )
+    $Guess = $Radicand
+    $Divisor = 0
+    $Term = 1 -shl 30
+
+    while ($Term -gt $Radicand) {
+        $Term = $Term -shr 2
+    }
+
+    while ($Term) {
+        if ($Guess -ge ($Divisor + $Term)) {
+            $Guess -= ($Divisor + $Term)
+            $Divisor = ($Divisor -shr 1) + $Term
+        }else {
+             $Divisor = $Divisor -shr 1
+        }
+        $Term = $Term -shr 2
+    }
+    return $Divisor
+}

exercises/practice/square-root/.meta/config.json

@@ -0,0 +1,17 @@
+{
+  "authors": ["glaxxie"],
+  "files": {
+    "solution": [
+      "SquareRoot.ps1"
+    ],
+    "test": [
+      "SquareRoot.tests.ps1"
+    ],
+    "example": [
+      ".meta/SquareRoot.example.ps1"
+    ]
+  },
+  "blurb": "Given a natural radicand, return its square root.",
+  "source": "wolf99",
+  "source_url": "https://github.com/exercism/problem-specifications/pull/1582"
+}

exercises/practice/square-root/.meta/tests.toml

@@ -0,0 +1,28 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[9b748478-7b0a-490c-b87a-609dacf631fd]
+description = "root of 1"
+
+[7d3aa9ba-9ac6-4e93-a18b-2e8b477139bb]
+description = "root of 4"
+
+[6624aabf-3659-4ae0-a1c8-25ae7f33c6ef]
+description = "root of 25"
+
+[93beac69-265e-4429-abb1-94506b431f81]
+description = "root of 81"
+
+[fbddfeda-8c4f-4bc4-87ca-6991af35360e]
+description = "root of 196"
+
+[c03d0532-8368-4734-a8e0-f96a9eb7fc1d]
+description = "root of 65025"

exercises/practice/square-root/SquareRoot.ps1

@@ -0,0 +1,21 @@
+Function Get-SquareRoot() {
+    <#
+    .SYNOPSIS
+    Given a natural radicand, return its square root.
+
+    .DESCRIPTION
+    The function takes a positive integer and return its square root value.
+
+    .PARAMETER Radicand
+    The number to get its square root.
+
+    .EXAMPLE
+    Get-SquareRoot -Radicand 25
+    Retuns: 5
+    #>
+    [CmdletBinding()]
+    Param(
+        [int]$Radicand
+    )
+    Throw "Please implement this function"
+}

exercises/practice/square-root/SquareRoot.tests.ps1

@@ -0,0 +1,29 @@
+BeforeAll {
+    . "./SquareRoot.ps1"
+}
+
+Describe "Square root test cases" {
+    It "root of 1" {
+        Get-SquareRoot -Radicand 1 | Should -Be 1
+    }
+
+    It "root of 4" {
+        Get-SquareRoot -Radicand 4 | Should -Be 2
+    }
+
+    It "root of 25" {
+        Get-SquareRoot -Radicand 25 | Should -Be 5
+    }
+
+    It "root of 81" {
+        Get-SquareRoot -Radicand 81 | Should -Be 9
+    }
+
+    It "root of 196" {
+        Get-SquareRoot -Radicand 196 | Should -Be 14
+    }
+
+    It "root of 65025" {
+        Get-SquareRoot -Radicand 65025 | Should -Be 255
+    }
+}