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to Twelve Days in the C# Track

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

Note:

This exercise has changed since this solution was written.

Output the lyrics to 'The Twelve Days of Christmas'.

On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.
On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.
On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the seventh day of Christmas my true love gave to me, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the tenth day of Christmas my true love gave to me, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the eleventh day of Christmas my true love gave to me, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the twelfth day of Christmas my true love gave to me, twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.

Hints

  • Try to capture the structure of the song in your code, where you build up the song by composing its parts.

Source

Wikipedia http://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song)

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

TwelveDaysTest.cs

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

using Xunit;

public class TwelveDaysTest
{
    [Fact]
    public void First_day_a_partridge_in_a_pear_tree()
    {
        var expected = "On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(1));
    }

    [Fact(Skip = "Remove to run test")]
    public void Second_day_two_turtle_doves()
    {
        var expected = "On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(2));
    }

    [Fact(Skip = "Remove to run test")]
    public void Third_day_three_french_hens()
    {
        var expected = "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(3));
    }

    [Fact(Skip = "Remove to run test")]
    public void Fourth_day_four_calling_birds()
    {
        var expected = "On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(4));
    }

    [Fact(Skip = "Remove to run test")]
    public void Fifth_day_five_gold_rings()
    {
        var expected = "On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(5));
    }

    [Fact(Skip = "Remove to run test")]
    public void Sixth_day_six_geese_a_laying()
    {
        var expected = "On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(6));
    }

    [Fact(Skip = "Remove to run test")]
    public void Seventh_day_seven_swans_a_swimming()
    {
        var expected = "On the seventh day of Christmas my true love gave to me, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(7));
    }

    [Fact(Skip = "Remove to run test")]
    public void Eighth_day_eight_maids_a_milking()
    {
        var expected = "On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(8));
    }

    [Fact(Skip = "Remove to run test")]
    public void Ninth_day_nine_ladies_dancing()
    {
        var expected = "On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(9));
    }

    [Fact(Skip = "Remove to run test")]
    public void Tenth_day_ten_lords_a_leaping()
    {
        var expected = "On the tenth day of Christmas my true love gave to me, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(10));
    }

    [Fact(Skip = "Remove to run test")]
    public void Eleventh_day_eleven_pipers_piping()
    {
        var expected = "On the eleventh day of Christmas my true love gave to me, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(11));
    }

    [Fact(Skip = "Remove to run test")]
    public void Twelfth_day_twelve_drummers_drumming()
    {
        var expected = "On the twelfth day of Christmas my true love gave to me, twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(12));
    }

    [Fact(Skip = "Remove to run test")]
    public void Recites_first_three_verses_of_the_song()
    {
        var expected = 
            "On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.\n" +
            "On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(1, 3));
    }

    [Fact(Skip = "Remove to run test")]
    public void Recites_three_verses_from_the_middle_of_the_song()
    {
        var expected = 
            "On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(4, 6));
    }

    [Fact(Skip = "Remove to run test")]
    public void Recites_the_whole_song()
    {
        var expected = 
            "On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.\n" +
            "On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the seventh day of Christmas my true love gave to me, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the tenth day of Christmas my true love gave to me, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the eleventh day of Christmas my true love gave to me, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n" +
            "On the twelfth day of Christmas my true love gave to me, twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.";
        Assert.Equal(expected, TwelveDays.Recite(1, 12));
    }
}
using System;

public static class TwelveDays
{
    private static string common = "On the {0} day of Christmas my true love gave to me,";
    private static string[] dailyVerse = new string[] {
        "a Partridge in a Pear Tree.",
        "two Turtle Doves,", 
        "three French Hens,", 
        "four Calling Birds,", 
        "five Gold Rings,", 
        "six Geese-a-Laying,", 
        "seven Swans-a-Swimming,", 
        "eight Maids-a-Milking,", 
        "nine Ladies Dancing,", 
        "ten Lords-a-Leaping,", 
        "eleven Pipers Piping,", 
        "twelve Drummers Drumming,", 
    };

    private static string[] dayth = new string[] {
        "first",
        "second",
        "third",
        "fourth",
        "fifth",
        "sixth",
        "seventh",
        "eighth",
        "ninth",
        "tenth",
        "eleventh",
        "twelfth",
    };

    public static string Recite(int verseNumber)
    {
        var result = new System.Text.StringBuilder(string.Format(common, dayth[verseNumber - 1]));
        for(var i = verseNumber - 1; i >= 0; i--)
        {
            var verse = dailyVerse[i];
            if(verseNumber > 1 && i == 0)
                verse = "and " + verse;

            result.Append($" {verse}");
        }

        return result.ToString();
    }

    public static string Recite(int startVerse, int endVerse)
    {
        var result = new System.Text.StringBuilder();
        for(var i = startVerse; i <= endVerse; i++)
        {
            result.Append(Recite(i));
            if(i != endVerse)
                result.Append("\n");
        }
        return result.ToString();
    }
}

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