Exercism: Car Assemble

csharp/cars-assemble/.exercism/config.json

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+{
+  "blurb": "Learn about numbers by analyzing the production of an assembly line.",
+  "contributors": [
+    "yzAlvin"
+  ],
+  "authors": [
+    "ErikSchierboom"
+  ],
+  "files": {
+    "solution": [
+      "CarsAssemble.cs"
+    ],
+    "test": [
+      "CarsAssembleTests.cs"
+    ],
+    "exemplar": [
+      ".meta/Exemplar.cs"
+    ]
+  }
+}

csharp/cars-assemble/.exercism/metadata.json

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+{"track":"csharp","exercise":"cars-assemble","id":"5edd50bd947e4680ac7fbb8764ba1531","url":"https://exercism.org/tracks/csharp/exercises/cars-assemble","handle":"JBiason","is_requester":true,"auto_approve":false}

csharp/cars-assemble/CarsAssemble.cs

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+using System;
+
+static class AssemblyLine
+{
+    public static double ProductionRatePerHour(int speed)
+    {
+        double production = speed * 221;
+        if (speed == 10) {
+            production *= 0.77;
+        } else if (speed == 9) {
+            production *= 0.8;
+        } else if (speed > 4) {
+            production *= 0.9;
+        }
+        return production;
+    }
+
+    public static int WorkingItemsPerMinute(int speed)
+    {
+        return (int)Math.Floor(ProductionRatePerHour(speed) / 60.0);
+    }
+}

csharp/cars-assemble/CarsAssemble.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
+    <PackageReference Include="Exercism.Tests" Version="0.1.0-beta1" />
+  </ItemGroup>
+
+</Project>

csharp/cars-assemble/CarsAssembleTests.cs

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+using Xunit;
+using Exercism.Tests;
+
+public class AssemblyLineTests
+{
+    [Fact]
+    public void Production_rate_per_hour_for_speed_zero()
+    {
+        Assert.Equal(0.0, AssemblyLine.ProductionRatePerHour(0), precision: 1);
+    }
+
+    [Fact]
+    public void Production_rate_per_hour_for_speed_one()
+    {
+        Assert.Equal(221.0, AssemblyLine.ProductionRatePerHour(1), precision: 1);
+    }
+
+    [Fact]
+    public void Production_rate_per_hour_for_speed_four()
+    {
+        Assert.Equal(884.0, AssemblyLine.ProductionRatePerHour(4), precision: 1);
+    }
+
+    [Fact]
+    public void Production_rate_per_hour_for_speed_seven()
+    {
+        Assert.Equal(1392.3, AssemblyLine.ProductionRatePerHour(7), precision: 1);
+    }
+
+    [Fact]
+    public void Production_rate_per_hour_for_speed_nine()
+    {
+        Assert.Equal(1591.2, AssemblyLine.ProductionRatePerHour(9), precision: 1);
+    }
+
+    [Fact]
+    public void Production_rate_per_hour_for_speed_ten()
+    {
+        Assert.Equal(1701.7, AssemblyLine.ProductionRatePerHour(10), precision: 1);
+    }
+
+    [Fact]
+    public void Working_items_per_minute_for_speed_zero()
+    {
+        Assert.Equal(0, AssemblyLine.WorkingItemsPerMinute(0));
+    }
+
+    [Fact]
+    public void Working_items_per_minute_for_speed_one()
+    {
+        Assert.Equal(3, AssemblyLine.WorkingItemsPerMinute(1));
+    }
+
+    [Fact]
+    public void Working_items_per_minute_for_speed_five()
+    {
+        Assert.Equal(16, AssemblyLine.WorkingItemsPerMinute(5));
+    }
+
+    [Fact]
+    public void Working_items_per_minute_for_speed_eight()
+    {
+        Assert.Equal(26, AssemblyLine.WorkingItemsPerMinute(8));
+    }
+
+    [Fact]
+    public void Working_items_per_minute_for_speed_nine()
+    {
+        Assert.Equal(26, AssemblyLine.WorkingItemsPerMinute(9));
+    }
+
+    [Fact]
+    public void Working_items_per_minute_for_speed_ten()
+    {
+        Assert.Equal(28, AssemblyLine.WorkingItemsPerMinute(10));
+    }
+}

csharp/cars-assemble/HELP.md

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+# Help
+
+## Running the tests
+
+You can run the tests by opening a command prompt in the exercise's directory, and then running the [`dotnet test` command](https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-test)
+Alternatively, most IDE's have built-in support for running tests, including [Visual Studio](https://docs.microsoft.com/en-us/visualstudio/test/run-unit-tests-with-test-explorer), [Rider](https://www.jetbrains.com/help/rider/Unit_Testing_in_Solution.html) and [Visual Studio code](https://github.com/OmniSharp/omnisharp-vscode/wiki/How-to-run-and-debug-unit-tests).
+See the [tests page](https://exercism.io/tracks/csharp/tests) for more information.
+
+## Skipped tests
+
+Initially, only the first test will be enabled.
+This is to encourage you to solve the exercise one step at a time.
+Once you get the first test passing, remove the `Skip` property from the next test and work on getting that test passing.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit CarsAssemble.cs` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [C# track's documentation](https://exercism.org/docs/tracks/csharp)
+- [Exercism's support channel on gitter](https://gitter.im/exercism/support)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [Gitter](https://gitter.im/exercism/xcsharp) is Exercism C# track's Gitter room; go here to get support and ask questions related to the C# track.
+- [/r/csharp](https://www.reddit.com/r/csharp) is the C# subreddit.
+- [StackOverflow](http://stackoverflow.com/questions/tagged/c%23) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

csharp/cars-assemble/HINTS.md

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+# Hints
+
+## General
+
+- [Numbers tutorial][numbers].
+
+## 1. Calculate the production rate per second
+
+- Determining the success rate can be done through a [conditional statement][if-statement].
+- C# allows for multiplication to be applied to two different number types (such as an `int` and a `double`). It will automatically return the "largest" data type.
+- Numbers can be compared using the built-in [comparison-][comparison-operators] and [equality operators][equality-operators].
+
+## 2. Calculate the number of working items produced per second
+
+- Whereas an `int` can be automatically converted to a `double`, the reverse does not hold. The reason for this is that an `int` has less precision than a `double` so rounding has to be applied, also the range of numbers an `int` can represent is smaller than a `double`. To force this conversion, one can either use one of the [`Convert` class' methods][convert-class] or [cast to an int][cast-int].
+
+[convert-class]: https://docs.microsoft.com/en-us/dotnet/api/system.convert?view=netcore-3.1#examples
+[cast-int]: https://www.dotnetperls.com/cast-int
+[numbers]: https://docs.microsoft.com/en-us/dotnet/csharp/tutorials/intro-to-csharp/numbers-in-csharp-local
+[if-statement]: https://csharp.net-tutorials.com/control-structures/if-statement/
+[comparison-operators]: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/comparison-operators
+[equality-operators]: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/equality-operators

csharp/cars-assemble/README.md

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+# Cars, Assemble!
+
+Welcome to Cars, Assemble! on Exercism's C# Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
+
+## Introduction
+
+## Numbers
+
+There are two different types of numbers in C#:
+
+- Integers: numbers with no digits behind the decimal separator (whole numbers). Examples are `-6`, `0`, `1`, `25`, `976` and `500000`.
+- Floating-point numbers: numbers with zero or more digits behind the decimal separator. Examples are `-2.4`, `0.1`, `3.14`, `16.984025` and `1024.0`.
+
+The two most common numeric types in C# are `int` and `double`. An `int` is a 32-bit integer and a `double` is a 64-bit floating-point number.
+
+Arithmetic is done using the standard arithmetic operators. Numbers can be compared using the standard numeric comparison operators and the equality (`==`) and inequality (`!=`) operators.
+
+C# has two types of numeric conversions:
+
+1. Implicit conversions: no data will be lost and no additional syntax is required.
+2. Explicit conversions: data could be lost and additional syntax in the form of a _cast_ is required.
+
+As an `int` has less precision than a `double`, converting from an `int` to a `double` is safe and is thus an implicit conversion. However, converting from a `double` to an `int` could mean losing data, so that requires an explicit conversion.
+
+## If Statements
+
+In this exercise you must conditionally execute logic. The most common way to do this in C# is by using an `if/else` statement:
+
+```csharp
+int x = 6;
+
+if (x == 5)
+{
+    // Execute logic if x equals 5
+}
+else if (x > 7)
+{
+    // Execute logic if x greater than 7
+}
+else
+{
+    // Execute logic in all other cases
+}
+```
+
+The condition of an `if` statement must be of type `bool`. C# has no concept of _truthy_ values.
+
+## Instructions
+
+In this exercise you'll be writing code to analyze the production of an assembly line in a car factory. The assembly line's speed can range from `0` (off) to `10` (maximum).
+
+At its lowest speed (`1`), `221` cars are produced each hour. The production increases linearly with the speed. So with the speed set to `4`, it should produce `4 * 221 = 884` cars per hour. However, higher speeds increase the likelihood that faulty cars are produced, which then have to be discarded. The following table shows how speed influences the success rate:
+
+- `1` to `4`: 100% success rate.
+- `5` to `8`: 90% success rate.
+- `9`: 80% success rate.
+- `10`: 77% success rate.
+
+You have two tasks.
+
+## 1. Calculate the production rate per hour
+
+Implement the (_static_) `AssemblyLine.ProductionRatePerHour()` method to calculate the assembly line's production rate per hour, taking into account its success rate:
+
+```csharp
+AssemblyLine.ProductionRatePerHour(6)
+// => 1193.4
+```
+
+Note that the value returned is a `double`.
+
+## 2. Calculate the number of working items produced per minute
+
+Implement the (_static_) `AssemblyLine.WorkingItemsPerMinute()` method to calculate how many working cars are produced per minute:
+
+```csharp
+AssemblyLine.WorkingItemsPerMinute(6)
+// => 19
+```
+
+Note that the value returned is an `int`.
+
+## Source
+
+### Created by
+
+- @ErikSchierboom
+
+### Contributed to by
+
+- @yzAlvin