Elon's Toy Why the distance don't update

Programming C#
1

Hello, and here is my code

using System;

class RemoteControlCar
{
    private int distance = 0;
    private int battery = 100;
    public static RemoteControlCar Buy()
    {
      return new RemoteControlCar();
    }

    public string DistanceDisplay()
    {
        return "Driven " + distance + " meters";
    }

    public string BatteryDisplay()
    {
        if (distance == 2000)
        {
            return "Battery empty";
        }
        else
        {
            return "Battery at "+battery+"%";
        }
    }

    public void Drive()
    {
        if(battery > 0)
        {
            distance = + 20;
            battery = - 1;
            
        }
        
    }
}

when it run



var car = new RemoteControlCar();
for (var i = 0; i < 17; i++)
        {
            car.Drive();
        }

it reports

Assert.Equal() Failure: Strings differ
↓ (pos 7)
Expected: “Driven 340 meters”
Actual: “Driven 20 meters”
↑ (pos 7)

it’s seems like my code failure to update the value of distance.

2

What is the value of the battery after the first call? What does the second call do with the battery check?

3

Take a close look at this: is it doing what you want it to do?

distance = + 20;
1 Like
4

Thank you!!