feat: new exercise difference-of-squares (#32)

config.json

@@ -178,6 +178,14 @@
           "sets"
         ],
         "difficulty": 6
+      },
+      {
+        "slug": "difference-of-squares",
+        "name": "Difference of Squares",
+        "uuid": "7051e75f-78a9-48b4-ac0a-7f6eb9262560",
+        "practices": [],
+        "prerequisites": ["basics", "numbers", "loops"],
+        "difficulty": 1
       }
     ]
   },

exercises/practice/difference-of-squares/.docs/instructions.md

@@ -0,0 +1,14 @@
+# Description
+
+Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
+
+The square of the sum of the first ten natural numbers is
+(1 + 2 + ... + 10)² = 55² = 3025.
+
+The sum of the squares of the first ten natural numbers is
+1² + 2² + ... + 10² = 385.
+
+Hence the difference between the square of the sum of the first ten natural numbers and the sum of the squares of the first ten natural numbers is 3025 - 385 = 2640.
+
+You are not expected to discover an efficient solution to this yourself from first principles; research is allowed, indeed, encouraged.
+Finding the best algorithm for the problem is a key skill in software engineering.

exercises/practice/difference-of-squares/.meta/Example.bat

@@ -0,0 +1,19 @@
+@echo off
+setlocal enabledelayedexpansion
+
+set "N=%~1"
+
+set /a sum=0
+set /a sum_of_squares=0
+
+for /l %%i in (1, 1, %N%) do (
+    set /a sum+=%%i
+
+    set /a square=%%i*%%i
+    set /a sum_of_squares+=!square!
+)
+
+set /a square_of_sum=!sum!*!sum!
+set /a difference=!square_of_sum!-!sum_of_squares!
+
+echo %difference%

exercises/practice/difference-of-squares/.meta/config.json

@@ -0,0 +1,16 @@
+{
+  "authors": ["GroophyLifefor"],
+  "files": {
+    "solution": [
+      "DifferenceOfSquares.bat"
+    ],
+    "test": [
+      "DifferenceOfSquaresTest.bat"
+    ],
+    "example": [
+      ".meta/Example.bat"
+    ]
+  },
+  "blurb": "Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.",
+  "source": "Problem 6 at Project Euler"
+}

exercises/practice/difference-of-squares/.meta/tests.toml

@@ -0,0 +1,13 @@
+# 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.
+
+[af9ffe10-dc13-42d8-a742-e7bdafac449d]
+description = "Say Hi!"

exercises/practice/difference-of-squares/DifferenceOfSquares.bat

@@ -0,0 +1,10 @@
+@echo off
+setlocal enabledelayedexpansion
+
+set "N=%~1"
+set "difference="
+
+REM Your code goes here
+
+
+echo %difference%

exercises/practice/difference-of-squares/DifferenceOfSquaresTest.bat

@@ -0,0 +1,104 @@
+@echo off
+REM ---------------------------------------------------
+REM Difference Of Squares Unit Testing
+REM 
+REM sUnit Testing Framework version: 0.2
+REM ---------------------------------------------------
+
+:Main
+    REM Initalize result variable
+    set "slug=DifferenceOfSquares"
+
+    CALL :Initialize
+
+    REM --------------------
+    REM Test Case Start \/\/
+    REM Resource: https://github.com/exercism/problem-specifications/blob/main/exercises/difference-of-squares/canonical-data.json
+    REM --------------------
+
+    REM Case Title:         difference of squares
+    REM Case Description:   Subtract sum of squares from square of sums
+    set "expected=0"
+    set "if_success=Test passed"
+    set "if_failed=Test failed: difference of squares 1"
+    CALL :Assert "1"
+
+    set "expected=170"
+    set "if_success=Test passed"
+    set "if_failed=Test failed: difference of squares 5"
+    CALL :Assert "5"
+
+    set "expected=25164150"
+    set "if_success=Test passed"
+    set "if_failed=Test failed: difference of squares 100"
+    CALL :Assert "100"
+
+    REM --------------------
+    REM Test Case End /\/\/\
+    REM --------------------
+
+    CALL :ResolveStatus
+    exit /b %errorlevel%
+REM End of Main
+
+REM ---------------------------------------------------
+REM Assert [..Parameters(up to 9)]
+REM ---------------------------------------------------
+GOTO :End REM Prevents the code below from being executed
+:Assert
+set "stdout="
+
+REM Run the program and capture the output then delete the file
+CALL %slug%.bat %1 %2 %3 %4 %5 %6 %7 %8 %9 > stdout.bin 2>&1
+set /p stdout=<stdout.bin
+del stdout.bin
+
+REM Check if the result is correct
+if "%stdout%" == "%expected%" (
+    if defined if_success (
+        echo %if_success%
+
+        REM Reset the variable to avoid duplicating the message.
+        set "if_success="
+        set "if_failed="
+    )
+
+    REM If the result is correct, exit with code 0
+    set /a successCount+=1
+    exit /b 0
+) else (
+    if defined if_failed (
+        echo %if_failed%
+
+        REM Reset the variable to avoid duplicating the message.
+        set "if_success="
+        set "if_failed="
+    )
+
+    REM If the result is incorrect, exit with code 1
+    set /a failCount+=1
+    exit /b 1
+)
+GOTO :EOF REM Go back to the line after the call to :Assert
+
+:Initialize
+REM It's for initialize, not about checking empty file
+set "successCount=0"
+set "failCount=0"
+GOTO :EOF REM Go back to the line after the call to :CheckEmptyFile
+
+:ResolveStatus
+set "status="
+if %failCount% gtr 0 (
+    REM status: Fail
+    REM message: The test failed.
+    exit /b 1
+
+) else (
+    REM status: Pass
+    exit /b 0
+
+)
+GOTO :EOF REM Go back to the line after the call to :ExportResultAsJson
+
+:End