Initial commit

.gitignore

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+.vs
+bin
+obj

Advent.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Advent.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29519.87
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Advent", "Advent.csproj", "{6D876526-1EA3-484C-B1B2-A6EEFEF7CA23}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6D876526-1EA3-484C-B1B2-A6EEFEF7CA23}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6D876526-1EA3-484C-B1B2-A6EEFEF7CA23}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6D876526-1EA3-484C-B1B2-A6EEFEF7CA23}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6D876526-1EA3-484C-B1B2-A6EEFEF7CA23}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1881BC49-072A-4A7E-9C3B-8172112237CC}
+	EndGlobalSection
+EndGlobal

Day1.cs

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+using System;
+using System.IO;
+
+namespace Advent
+{
+    public static class Day1
+    {
+        public static void Execute()
+        {
+            var lines = File.ReadAllLines(@"C:\Users\chris\OneDrive\Desktop\input.txt");
+
+            var total = 0.0;
+
+            foreach (var line in lines)
+            {
+                var mass = double.Parse(line);
+
+                var fuel = CalculateFuel(mass);
+
+                total += fuel;
+            }
+
+            Console.WriteLine(total);
+        }
+
+        private static double CalculateFuel(double mass)
+        {
+            var totalFuel = 0.0;
+
+            var fuel = Math.Floor(mass / 3) - 2;
+
+            totalFuel += fuel;
+
+            while (fuel > 2)
+            {
+                fuel = Math.Floor(fuel / 3) - 2;
+
+                if (fuel < 0)
+                    fuel = 0;
+
+                totalFuel += fuel;
+            }
+
+            return totalFuel;
+        }
+    }
+}

Day2.cs

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+using System;
+using System.IO;
+using System.Linq;
+
+namespace Advent
+{
+    public static class Day2
+    {
+        public static void Execute()
+        {
+            for (var noun = 0; noun <= 99; noun++)
+                for (var verb = 0; verb <= 99; verb++)
+                {
+                    var result = Calculate(noun, verb);
+
+                    if (result == 19690720)
+                        Console.WriteLine(100 * noun + verb);
+                }
+        }
+
+        private static int Calculate(int noun, int verb)
+        {
+            var lines = File.ReadAllLines(@"C:\Users\chris\OneDrive\Desktop\input.txt");
+
+            var codes = lines[0].Split(',').Select(int.Parse).ToArray();
+
+            codes[1] = noun;
+            codes[2] = verb;
+
+            var position = 0;
+            var done = false;
+
+            while (!done)
+            {
+                switch (codes[position])
+                {
+                    case 1:
+                        codes[codes[position + 3]] = codes[codes[position + 1]] + codes[codes[position + 2]];
+
+                        position += 4;
+
+                        break;
+
+                    case 2:
+                        codes[codes[position + 3]] = codes[codes[position + 1]] * codes[codes[position + 2]];
+
+                        position += 4;
+
+                        break;
+
+                    case 99:
+                        done = true;
+
+                        break;
+                }
+            }
+
+            return codes[0];
+        }
+    }
+}

Program.cs

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+namespace Advent
+{
+    internal static class Program
+    {
+        private static void Main()
+        {
+            Day2.Execute();
+        }
+    }
+}

README.md

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 # Advent2019
-https://adventofcode.com/
+
+My son wanted me to commit my code for [Advent of Code 2019](https://adventofcode.com/) so he could compare it to his own.