Add back deleted, deprecated exercises

config.json

@@ -1240,6 +1240,30 @@
       ],
       "unlocked_by": "markdown",
       "uuid": "a5794706-58d2-48f7-8aab-78639d7bce77"
+    },
+    {
+      "core": false,
+      "deprecated": true,
+      "slug": "binary",
+      "uuid": "cef7deef-54ce-4201-b263-7cd2098533f8"
+    },
+    {
+      "core": false,
+      "deprecated": true,
+      "slug": "trinary",
+      "uuid": "c7dd8467-87e2-4997-a96e-a04cb8b891e8"
+    },
+    {
+      "core": false,
+      "deprecated": true,
+      "slug": "octal",
+      "uuid": "c8555f37-9976-4f52-a5db-6a680ec8d53b"
+    },
+    {
+      "core": false,
+      "deprecated": true,
+      "slug": "hexadecimal",
+      "uuid": "5d30c5a0-0f69-4b79-8c7e-3b1fe6a5707f"
     }
   ],
   "foregone": [

exercises/binary/Binary.cs

@@ -0,0 +1,9 @@
+using System;
+
+public class Binary
+{
+    public static int ToDecimal(string binary)
+    {
+        throw new NotImplementedException("You need to implement this function.");
+    }
+}

exercises/binary/Binary.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Example.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="xunit" Version="2.3.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
+  </ItemGroup>
+
+</Project>

exercises/binary/BinaryTest.cs

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+using Xunit;
+
+public class BinaryTest
+{
+    [Fact]
+    public void Binary_0_is_decimal_0()
+    {
+        Assert.Equal(0, Binary.ToDecimal("0"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_1_is_decimal_1()
+    {
+        Assert.Equal(1, Binary.ToDecimal("1"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_10_is_decimal_2()
+    {
+        Assert.Equal(2, Binary.ToDecimal("10"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_11_is_decimal_3()
+    {
+        Assert.Equal(3, Binary.ToDecimal("11"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_100_is_decimal_4()
+    {
+        Assert.Equal(4, Binary.ToDecimal("100"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_1001_is_decimal_9()
+    {
+        Assert.Equal(9, Binary.ToDecimal("1001"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_11010_is_decimal_26()
+    {
+        Assert.Equal(26, Binary.ToDecimal("11010"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_10001101000_is_decimal_1128()
+    {
+        Assert.Equal(1128, Binary.ToDecimal("10001101000"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Binary_ignores_leading_zeros()
+    {
+        Assert.Equal(31, Binary.ToDecimal("000011111"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Invalid_binary_2_converts_to_decimal_0()
+    {
+        Assert.Equal(0, Binary.ToDecimal("2"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_number_containing_a_non_binary_digit_is_invalid()
+    {
+        Assert.Equal(0, Binary.ToDecimal("01201"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_number_with_trailing_non_binary_characters_is_invalid()
+    {
+        Assert.Equal(0, Binary.ToDecimal("10nope"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_number_with_leading_non_binary_characters_is_invalid()
+    {
+        Assert.Equal(0, Binary.ToDecimal("nope10"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_number_with_internal_non_binary_characters_is_invalid()
+    {
+        Assert.Equal(0, Binary.ToDecimal("10nope10"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void A_number_and_a_word_whitespace_separated_is_invalid()
+    {
+        Assert.Equal(0, Binary.ToDecimal("001 nope"));
+    }
+}

exercises/binary/Example.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Linq;
+
+public class Binary
+{
+    public static int ToDecimal(string binary)
+    {
+        if (IsNotValidBinary(binary)) return 0;
+
+        return binary
+            .Select((c, i) => int.Parse(c.ToString()) * TwoToThePowerOf(binary.Length - i - 1))
+            .Sum();
+    }
+
+    private static bool IsNotValidBinary(string binary)
+    {
+        return !binary.All(x => char.IsDigit(x) && int.Parse(x.ToString()) < 2);
+    }
+
+    private static int TwoToThePowerOf(int power)
+    {
+        return (int)Math.Pow(2, power);
+    }
+}

exercises/binary/README.md

@@ -0,0 +1,41 @@
+# Binary
+
+Convert a binary number, represented as a string (e.g. '101010'), to its decimal equivalent using first principles.
+
+Implement binary to decimal conversion. Given a binary input
+string, your program should produce a decimal output. The
+program should handle invalid inputs.
+
+## Note
+- Implement the conversion yourself.
+  Do not use something else to perform the conversion for you.
+
+## About Binary (Base-2)
+Decimal is a base-10 system.
+
+A number 23 in base 10 notation can be understood
+as a linear combination of powers of 10:
+
+- The rightmost digit gets multiplied by 10^0 = 1
+- The next number gets multiplied by 10^1 = 10
+- ...
+- The *n*th number gets multiplied by 10^*(n-1)*.
+- All these values are summed.
+
+So: `23 => 2*10^1 + 3*10^0 => 2*10 + 3*1 = 23 base 10`
+
+Binary is similar, but uses powers of 2 rather than powers of 10.
+
+So: `101 => 1*2^2 + 0*2^1 + 1*2^0 => 1*4 + 0*2 + 1*1 => 4 + 1 => 5 base 10`.
+
+### Submitting Exercises
+
+Note that, when trying to submit an exercise, make sure the exercise file that you're submitting is in the `exercism/csharp/<exerciseName>` directory.
+
+For example, if you're submitting `bob.cs` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/csharp/bob/bob.cs`.
+## Source
+
+All of Computer Science [http://www.wolframalpha.com/input/?i=binary&a=*C.binary-_*MathWorld-](http://www.wolframalpha.com/input/?i=binary&a=*C.binary-_*MathWorld-)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/hexadecimal/Example.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+public class Hexadecimal
+{
+    private static readonly Dictionary<char, int> AlphaValues = new Dictionary<char, int>
+        {
+            { 'a', 10 },
+            { 'b', 11 },
+            { 'c', 12 },
+            { 'd', 13 },
+            { 'e', 14 },
+            { 'f', 15 }
+        };
+
+    public static int ToDecimal(string value)
+    {
+        if (IsNotValidHexadecimal(value)) return 0;
+
+        return value.Select((c, i) => GetNumericValue(c) * SixteenToThePowerOf(value.Length - i - 1)).Sum();
+    }
+
+    private static bool IsNotValidHexadecimal(string value)
+    {
+        return Regex.IsMatch(value, "[^0-9abcdef]", RegexOptions.IgnoreCase);
+    }
+
+    private static int GetNumericValue(char value)
+    {
+        if (char.IsNumber(value))
+            return (int)char.GetNumericValue(value);
+        return AlphaValues[value];
+    }
+
+    private static int SixteenToThePowerOf(int power)
+    {
+        return (int)Math.Pow(16, power);
+    }
+}

exercises/hexadecimal/Hexadecimal.cs

@@ -0,0 +1,9 @@
+using System;
+
+public class Hexadecimal
+{
+    public static int ToDecimal(string value)
+    {
+        throw new NotImplementedException("You need to implement this function.");
+    }
+}

exercises/hexadecimal/Hexadecimal.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Example.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="xunit" Version="2.3.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
+  </ItemGroup>
+
+</Project>

exercises/hexadecimal/HexadecimalTest.cs

@@ -0,0 +1,65 @@
+using Xunit;
+
+public class HexadecimalTest
+{
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_1_is_decimal_1()
+    {
+        Assert.Equal(1, Hexadecimal.ToDecimal("1"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_c_is_decimal_12()
+    {
+        Assert.Equal(12, Hexadecimal.ToDecimal("c"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_10_is_decimal_16()
+    {
+        Assert.Equal(16, Hexadecimal.ToDecimal("10"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_af_is_decimal_175()
+    {
+        Assert.Equal(175, Hexadecimal.ToDecimal("af"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_100_is_decimal_256()
+    {
+        Assert.Equal(256, Hexadecimal.ToDecimal("100"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_19ace_is_decimal_105166()
+    {
+        Assert.Equal(105166, Hexadecimal.ToDecimal("19ace"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_carrot_is_decimal_0()
+    {
+        Assert.Equal(0, Hexadecimal.ToDecimal("carrot"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_000000_is_decimal_0()
+    {
+        Assert.Equal(0, Hexadecimal.ToDecimal("000000"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_ffffff_is_decimal_16777215()
+    {
+        Assert.Equal(16777215, Hexadecimal.ToDecimal("ffffff"));
+    }
+
+    [Fact(Skip = "Remove to run test")]
+    public void Hexadecimal_ffff00_is_decimal_16776960()
+    {
+        Assert.Equal(16776960, Hexadecimal.ToDecimal("ffff00"));
+    }
+
+}

exercises/hexadecimal/README.md

@@ -0,0 +1,20 @@
+# Hexadecimal
+
+Convert a hexadecimal number, represented as a string (e.g. "10af8c"), to its decimal equivalent using first principles (i.e. no, you may not use built-in or external libraries to accomplish the conversion).
+
+On the web we use hexadecimal to represent colors, e.g. green: 008000,
+teal: 008080, navy: 000080).
+
+The program should handle invalid hexadecimal strings.
+
+### Submitting Exercises
+
+Note that, when trying to submit an exercise, make sure the exercise file that you're submitting is in the `exercism/csharp/<exerciseName>` directory.
+
+For example, if you're submitting `bob.cs` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/csharp/bob/bob.cs`.
+## Source
+
+All of Computer Science [http://www.wolframalpha.com/examples/NumberBases.html](http://www.wolframalpha.com/examples/NumberBases.html)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.