CritCalculator.cs

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;

/// <summary>
/// Crit Calculator for https://www.reddit.com/r/dailyprogrammer/comments/4nvrnx/20160613_challenge_271_easy_critical_hit/
/// wrote a caclculator for the crit calculator, and did some unit tests for it as well.
/// </summary>
namespace CritCalculator
{
    class TestCritCalculator
    {
        static void Main(string[] args)
        {
            CritCalculator c = new CritCalculator();
            c.critCalcTest();
            Console.ReadKey(true);
        }
    }
    class CritCalculator
    {
        public int intDiceSides;
        public int intEnemyHealth;

        public double probabilityOfDeath()
        {
            int intTimesRoll = intEnemyHealth / intDiceSides;
            int intLastRoll = intEnemyHealth % intDiceSides;
            double dblProbablity = 1.0 / intDiceSides;
            double dblLastRollProb = (intLastRoll == 0) ? 1.0 : ((double)(intDiceSides + 1 - intLastRoll) / intDiceSides);

            return Math.Pow(dblProbablity, intTimesRoll) * dblLastRollProb;
        }

        public void critCalcTest()
        {
            try
            {
                intDiceSides = 4;
                intEnemyHealth = 1;
                Assert.AreEqual(1, probabilityOfDeath());
                intDiceSides = 4;
                intEnemyHealth = 4;
                Assert.AreEqual(0.25, probabilityOfDeath());
                intDiceSides = 4;
                intEnemyHealth = 5;
                Assert.AreEqual(0.25, probabilityOfDeath());
                intDiceSides = 4;
                intEnemyHealth = 6;
                Assert.AreEqual(0.1875, probabilityOfDeath());
                intDiceSides = 1;
                intEnemyHealth = 10;
                Assert.AreEqual(1, probabilityOfDeath());
                intDiceSides = 100;
                intEnemyHealth = 200;
                Assert.AreEqual(0.0001, probabilityOfDeath());
                intDiceSides = 8;
                intEnemyHealth = 20;
                Assert.AreEqual(0.009765625, probabilityOfDeath());
                Console.WriteLine("All Tests Passed!");
            }
            catch (AssertFailedException)
            {
                Console.WriteLine("Assert Failed!");
            }
        }
        
    }
}