# artemkorsakov's solution

## to D&D Character in the C# Track

Published at Apr 27 2019 · 0 comments
Instructions
Test suite
Solution

#### Note:

This exercise has changed since this solution was written.

For a game of Dungeons & Dragons, each player starts by generating a character they can play with. This character has, among other things, six abilities; strength, dexterity, constitution, intelligence, wisdom and charisma. These six abilities have scores that are determined randomly. You do this by rolling four 6-sided dice and record the sum of the largest three dice. You do this six times, once for each ability.

Your character's initial hitpoints are 10 + your character's constitution modifier. You find your character's constitution modifier by subtracting 10 from your character's constitution, divide by 2 and round down.

Write a random character generator that follows the rules above.

For example, the six throws of four dice may look like:

• 5, 3, 1, 6: You discard the 1 and sum 5 + 3 + 6 = 14, which you assign to strength.
• 3, 2, 5, 3: You discard the 2 and sum 3 + 5 + 3 = 11, which you assign to dexterity.
• 1, 1, 1, 1: You discard the 1 and sum 1 + 1 + 1 = 3, which you assign to constitution.
• 2, 1, 6, 6: You discard the 1 and sum 2 + 6 + 6 = 14, which you assign to intelligence.
• 3, 5, 3, 4: You discard the 3 and sum 5 + 3 + 4 = 12, which you assign to wisdom.
• 6, 6, 6, 6: You discard the 6 and sum 6 + 6 + 6 = 18, which you assign to charisma.

Because constitution is 3, the constitution modifier is -4 and the hitpoints are 6.

## Notes

Most programming languages feature (pseudo-)random generators, but few programming languages are designed to roll dice. One such language is Troll.

## 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 DndCharacter.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

Simon Shine, Erik Schierboom https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945

### DndCharacterTest.cs

``````// This file was auto-generated based on version 1.1.0 of the canonical data.

using System.Linq;
using Xunit;

public class DndCharacterTest
{
[Fact]
public void Ability_modifier_for_score_3_is_minus_4()
{
Assert.Equal(-4, DndCharacter.Modifier(3));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_4_is_minus_3()
{
Assert.Equal(-3, DndCharacter.Modifier(4));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_5_is_minus_3()
{
Assert.Equal(-3, DndCharacter.Modifier(5));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_6_is_minus_2()
{
Assert.Equal(-2, DndCharacter.Modifier(6));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_7_is_minus_2()
{
Assert.Equal(-2, DndCharacter.Modifier(7));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_8_is_minus_1()
{
Assert.Equal(-1, DndCharacter.Modifier(8));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_9_is_minus_1()
{
Assert.Equal(-1, DndCharacter.Modifier(9));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_10_is_0()
{
Assert.Equal(0, DndCharacter.Modifier(10));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_11_is_0()
{
Assert.Equal(0, DndCharacter.Modifier(11));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_12_is_1()
{
Assert.Equal(1, DndCharacter.Modifier(12));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_13_is_1()
{
Assert.Equal(1, DndCharacter.Modifier(13));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_14_is_2()
{
Assert.Equal(2, DndCharacter.Modifier(14));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_15_is_2()
{
Assert.Equal(2, DndCharacter.Modifier(15));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_16_is_3()
{
Assert.Equal(3, DndCharacter.Modifier(16));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_17_is_3()
{
Assert.Equal(3, DndCharacter.Modifier(17));
}

[Fact(Skip = "Remove to run test")]
public void Ability_modifier_for_score_18_is_4()
{
Assert.Equal(4, DndCharacter.Modifier(18));
}

[Fact(Skip = "Remove to run test")]
public void Random_ability_is_within_range()
{
for (var i = 0; i < 10; i++)
{
Assert.InRange(DndCharacter.Ability(), 3, 18);
}
}

[Fact(Skip = "Remove to run test")]
public void Random_character_is_valid()
{
for (var i = 0; i < 10; i++)
{
var sut = DndCharacter.Generate();
Assert.InRange(sut.Strength, 3, 18);
Assert.InRange(sut.Dexterity, 3, 18);
Assert.InRange(sut.Constitution, 3, 18);
Assert.InRange(sut.Intelligence, 3, 18);
Assert.InRange(sut.Wisdom, 3, 18);
Assert.InRange(sut.Charisma, 3, 18);
Assert.Equal(sut.Hitpoints, 10 + DndCharacter.Modifier(sut.Constitution));
}
}

[Fact(Skip = "Remove to run test")]
public void Each_ability_is_only_calculated_once()
{
for (var i = 0; i < 10; i++)
{
var sut = DndCharacter.Generate();
Assert.Equal(sut.Strength, sut.Strength);
Assert.Equal(sut.Dexterity, sut.Dexterity);
Assert.Equal(sut.Constitution, sut.Constitution);
Assert.Equal(sut.Intelligence, sut.Intelligence);
Assert.Equal(sut.Wisdom, sut.Wisdom);
Assert.Equal(sut.Charisma, sut.Charisma);
}
}
}``````
``````﻿using System;
using System.Linq;

public class DndCharacter
{
public int Strength { get; } = Ability();
public int Dexterity { get; } = Ability();
public int Constitution { get; } = Ability();
public int Intelligence { get; } = Ability();
public int Wisdom { get; } = Ability();
public int Charisma { get; } = Ability();
public int Hitpoints { get; private set; }

public static int Modifier(int score) => (int)Math.Floor(((double)score - 10) / 2);

public static int Ability()
{
int[] dices = new int[] { getDice(), getDice(), getDice(), getDice() };
return dices.Sum() - dices.Min();
}

public static DndCharacter Generate()
{
var dndCharacter = new DndCharacter();
dndCharacter.Hitpoints = 10 + Modifier(dndCharacter.Constitution);
return dndCharacter;
}

private static int getDice() => random.Next(6) + 1;
private static Random random = new Random();
}``````

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