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![Roberto Martinez](https://secure.gravatar.com/avatar/03179962a79a65d58f4075397dc6d117?s=96&d=https%3A%2F%2Fecs-static.teamtreehouse.com%2Fassets%2Fcontent%2Fdefault_avatar-445fbbabfc8dc9188fb5967fe43322ee0c3e0dd1e10f378bf8343784af5a13eb.webp&r=pg)
Roberto Martinez
3,322 PointsHelp - 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 type
double' 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;
}
}
}
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;
}
}
}
namespace Treehouse.CodeChallenges
{
public class Frog
{
public int TongueLength { get; }
public Frog(int tongueLength)
{
TongueLength = tongueLength;
}
}
}
2 Answers
![Steven Parker](https://uploads.teamtreehouse.com/production/profile-photos/969492/micro_tool_chess_set_2.jpg)
Steven Parker
230,688 PointsYou 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](https://secure.gravatar.com/avatar/03179962a79a65d58f4075397dc6d117?s=96&d=https%3A%2F%2Fecs-static.teamtreehouse.com%2Fassets%2Fcontent%2Fdefault_avatar-445fbbabfc8dc9188fb5967fe43322ee0c3e0dd1e10f378bf8343784af5a13eb.webp&r=pg)
Roberto Martinez
3,322 PointsSteven, Thank you! That helped. I figured it out.