Week 15 Interfaces and Inheritance | Demonstrate an understanding of estimating a unit of work and the implications of late delivery| Day 73

2. In Bicycle.cs, create an empty Bicycle class that inherits Vehicle.
3. Define a constructor that:

has one double parameter for setting the Speed property

calls base() with that parameter

in its body, sets Wheels to 2

4. Define a public void SpeedUp() method that limits the Speed to 15. In other words, in the method body:

Add 5 to Speed

If Speed is greater than 15, set it to 15

An error might occur here, which is okay.

5. You probably saw the warning:

warning CS0108: ‘Bicycle.SpeedUp()’ hides inherited member ‘Vehicle.SpeedUp()’. Use the new keyword if hiding was intended.

The computer suggests using the new approach, but we prefer override for its clarity.

In Bicycle.cs, label SpeedUp() with override.

6. Now your probably saw the error:

error CS0506: ‘Bicycle.SpeedUp()’: cannot override inherited member ‘Vehicle.SpeedUp()’ because it is not marked virtual, abstract, or override

In Vehicle.cs, label SpeedUp() with virtual.

7. Repeat the process with SlowDown() in Bicycle.cs (let’s assume that only sedans and trucks can go in reverse). It should override the inherited version and limit the Speed to 0. In other words, the method:

Subtracts 5 from Speed

Sets it to 0 if Speed is less than 0

Is labeled override

8. In Vehicle.cs, label SlowDown() with virtual.

Hints:

1. The format of an automatic property with get and protected set is:

public bool IsFake
{ get; protected set; }

2. Declare a class using the class keyword and inherit a superclass with the colon syntax. For example:

class Dog : Animal
{}

3. Here’s an example of another class calling its base constructor:

class Dog : Animal
{
  public Dog(int age) : base(age)
  {
  }
}

4. None
5. The override keyword belongs in the first line of the method, like:

public override void FakeIt()

Some compilers will show a similar warning that mentions both override and new:

warning CS0114: ‘Bicycle.SpeedUp()’ hides inherited member ‘Vehicle.SpeedUp()’. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

6. The virtual keyword belongs in the first line of the method, like:

public virtual void FakeIt()

Solution: