Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# C# Objects Loops and Final Touches For Loops

Posted by Roberto Martinez
Roberto Martinez
3,322 Points

Help - Error with Frog/Loop Challenge code

I am getting the following error and I can't figure out why: FrogStats.cs(21,17): error CS0019: Operator +=' cannot be applied to operands of typedouble' and `Treehouse.CodeChallenges.Frog' Compilation failed: 1 error(s), 0 warnings

Code:

namespace Treehouse.CodeChallenges { class FrogStats { private readonly Frog _tongueLength;

    public FrogStats(Frog tongueLength)
    {
        _tongueLength = tongueLength;
    }

    public static double GetAverageTongueLength(Frog[] frogs)
    {
        double sum = 0;
        double tally = 0;
        double average = 0;

        for(int i = 0; i < frogs.Length; i++)
        {
            Frog frog = frogs[i];
            sum += frog;

            i++;
        }

        average = sum / frogs.Length - 1;
        return average;
    }
}

}

FrogStats.cs 
namespace Treehouse.CodeChallenges
{
    class FrogStats
    {
        private readonly Frog _tongueLength;

        public FrogStats(Frog tongueLength)
        {
            _tongueLength = tongueLength;
        }

        public static double GetAverageTongueLength(Frog[] frogs)
        {
            double sum = 0;
            double tally = 0;
            double average = 0;

            for(int i = 0; i < frogs.Length; i++)
            {
                Frog frog = frogs[i];
                sum += frog;

                i++;
            }

            average = sum / frogs.Length-1;
            return average;
        }
    }
}
Frog.cs 
namespace Treehouse.CodeChallenges
{
    public class Frog
    {
        public int TongueLength { get; }

        public Frog(int tongueLength)
        {
            TongueLength = tongueLength;
        }
    }
}

2 Answers

Steven Parker
Steven Parker
230,274 Points
Steven Parker
Steven Parker
230,274 Points

You can't add a "frog" to a number. You probably only wanted to add the frog's tongue length.

Also, you have an increment clause in your "for" loop, but also a separate increment statement inside the loop (you probably don't want both). And why would you subtract one from the average?

Roberto Martinez
Roberto Martinez
3,322 Points
Roberto Martinez
Roberto Martinez
3,322 Points

Steven, Thank you! That helped. I figured it out.