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Confused about how to Change SequenceDetector.Scan to an abstract method.

RepeatDetector.cs

namespace Treehouse.CodeChallenges
{
    public class RepeatDetector : SequenceDetector
    {
        public override string Description => "Detects repetitions";

        public override bool Scan(int[] sequence)
        {
            LastScannedSequence = sequence;

            if(sequence.Length < 2)
            {
                return false;
            }

            for(int i = 1; i < sequence.Length; ++i)
            {
                if(sequence[i] == sequence[i-1])
                {
                    return true;
                }
            }

            return false;
        }
    }
}

SequenceDetector.cs

namespace Treehouse.CodeChallenges
{
    public abstract class SequenceDetector
    {
        public virtual string Description => "";

        public int[] LastScannedSequence { get; protected set; }

        public virtual bool Scan(int[] sequence)
        {
            LastScannedSequence = sequence;
            return true;
        }
    }
}

Answer 1 · 2016-09-21T16:29:18Z

September 21, 2016 4:29pm

In the SequenceDetector class, you need to change virtual to abstract, and also get rid of the method body. So it would be just like this: public abstract bool Scan(int[] sequence); We want the class inheriting this method to override and implement the method with a method body.

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Calvin Secrest

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Brian DuPont

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