# matthewwsavoie's solution

## to Darts in the C# Track

Published at Oct 04 2019 · 0 comments
Instructions
Test suite
Solution

Write a function that returns the earned points in a single toss of a Darts game.

Darts is a game where players throw darts to a target.

In our particular instance of the game, the target rewards with 4 different amounts of points, depending on where the dart lands:

• If the dart lands outside the target, player earns no points (0 points).
• If the dart lands in the outer circle of the target, player earns 1 point.
• If the dart lands in the middle circle of the target, player earns 5 points.
• If the dart lands in the inner circle of the target, player earns 10 points.

The outer circle has a radius of 10 units (This is equivalent to the total radius for the entire target), the middle circle a radius of 5 units, and the inner circle a radius of 1. Of course, they are all centered to the same point (That is, the circles are concentric) defined by the coordinates (0, 0).

Write a function that given a point in the target (defined by its `real` cartesian coordinates `x` and `y`), returns the correct amount earned by a dart landing in that point.

## Running the tests

To run the tests, run the command `dotnet test` from within the exercise directory.

Initially, only the first test will be enabled. This is to encourage you to solve the exercise one step at a time. Once you get the first test passing, remove the `Skip` property from the next test and work on getting that test passing. Once none of the tests are skipped and they are all passing, you can submit your solution using `exercism submit Darts.cs`

## Further information

For more detailed information about the C# track, including how to get help if you're having trouble, please visit the exercism.io C# language page.

## Source

Inspired by an excersie created by a professor Della Paolera in Argentina

### DartsTest.cs

``````// This file was auto-generated based on version 2.2.0 of the canonical data.

using Xunit;

public class DartsTest
{
[Fact]
public void Missed_target()
{
Assert.Equal(0, Darts.Score(-9, 9));
}

[Fact(Skip = "Remove to run test")]
public void On_the_outer_circle()
{
Assert.Equal(1, Darts.Score(0, 10));
}

[Fact(Skip = "Remove to run test")]
public void On_the_middle_circle()
{
Assert.Equal(5, Darts.Score(-5, 0));
}

[Fact(Skip = "Remove to run test")]
public void On_the_inner_circle()
{
Assert.Equal(10, Darts.Score(0, -1));
}

[Fact(Skip = "Remove to run test")]
public void Exactly_on_centre()
{
Assert.Equal(10, Darts.Score(0, 0));
}

[Fact(Skip = "Remove to run test")]
public void Near_the_centre()
{
Assert.Equal(10, Darts.Score(-0.1, -0.1));
}

[Fact(Skip = "Remove to run test")]
public void Just_within_the_inner_circle()
{
Assert.Equal(10, Darts.Score(0.7, 0.7));
}

[Fact(Skip = "Remove to run test")]
public void Just_outside_the_inner_circle()
{
Assert.Equal(5, Darts.Score(0.8, -0.8));
}

[Fact(Skip = "Remove to run test")]
public void Just_within_the_middle_circle()
{
Assert.Equal(5, Darts.Score(-3.5, 3.5));
}

[Fact(Skip = "Remove to run test")]
public void Just_outside_the_middle_circle()
{
Assert.Equal(1, Darts.Score(-3.6, -3.6));
}

[Fact(Skip = "Remove to run test")]
public void Just_within_the_outer_circle()
{
Assert.Equal(1, Darts.Score(-7, 7));
}

[Fact(Skip = "Remove to run test")]
public void Just_outside_the_outer_circle()
{
Assert.Equal(0, Darts.Score(7.1, -7.1));
}

[Fact(Skip = "Remove to run test")]
public void Asymmetric_position_between_the_inner_and_middle_circles()
{
Assert.Equal(5, Darts.Score(0.5, -4));
}
}``````
``````﻿using System;

public static class Darts
{

public static int Score(double x, double y)
{

var z = Math.Sqrt(Math.Pow(x, 2) + Math.Pow(y, 2));

return (
z <= 1 ?
10 :
z <= 5 ?
5 :
z <= 10 ?
1 :
0
);

}

}``````

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