docs(cars-assemble): add cast example, fix formatting

concepts/numbers/introduction.md

@@ -15,3 +15,14 @@ C# has two types of numeric conversions:
 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.
+
+```csharp
+int softCool = 1358938113;
+double notLost = 4.8151623;
+
+// implicit cast: no loss of information
+double macDebug = softCool;         // 1358938113.0
+
+// explicit cast: possible loss of information 
+int somethingLost = (int)notLost;   // 4
+```

exercises/concept/cars-assemble/.docs/hints.md

@@ -11,12 +11,15 @@
 ## 2. Calculate the production rate per second
 
 - Use the `AssemblyLine.SuccessRate()` method you wrote earlier to determine the success rate.
-- 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.
+- 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].
 
 ## 3. 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].
+- 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
 [cast-int]: https://www.dotnetperls.com/cast-int

exercises/concept/cars-assemble/.docs/instructions.md

@@ -1,14 +1,19 @@
 # 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).
+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. 
+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. 
 
 You have three tasks.
 
 ## 1. Calculate the success rate
 
-Implement the (_static_) `AssemblyLine.SuccessRate()` method to calculate the ratio of an item being created without error for a given speed. The following table shows how speed influences the success rate:
+Implement the (_static_) `AssemblyLine.SuccessRate()` method to calculate the ratio of an item being created without error for a given speed.
+The following table shows how speed influences the success rate:
 
 - `0`: 0% success rate.
 - `1` to `4`: 100% success rate.

exercises/concept/cars-assemble/.docs/introduction.md

@@ -18,6 +18,17 @@ C# has two types of numeric conversions:
 
 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.
 
+```csharp
+int softCool = 1358938113;
+double notLost = 4.8151623;
+
+// implicit cast: no loss of information
+double macDebug = softCool;         // 1358938113.0
+
+// explicit cast: possible loss of information 
+int somethingLost = (int)notLost;   // 4
+```
+
 ## 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: