# Beer Song Produce the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall. Note that not all verses are identical. ```plain 99 bottles of beer on the wall, 99 bottles of beer. Take one down and pass it around, 98 bottles of beer on the wall. 98 bottles of beer on the wall, 98 bottles of beer. Take one down and pass it around, 97 bottles of beer on the wall. 97 bottles of beer on the wall, 97 bottles of beer. Take one down and pass it around, 96 bottles of beer on the wall. 96 bottles of beer on the wall, 96 bottles of beer. Take one down and pass it around, 95 bottles of beer on the wall. 95 bottles of beer on the wall, 95 bottles of beer. Take one down and pass it around, 94 bottles of beer on the wall. 94 bottles of beer on the wall, 94 bottles of beer. Take one down and pass it around, 93 bottles of beer on the wall. 93 bottles of beer on the wall, 93 bottles of beer. Take one down and pass it around, 92 bottles of beer on the wall. 92 bottles of beer on the wall, 92 bottles of beer. Take one down and pass it around, 91 bottles of beer on the wall. 91 bottles of beer on the wall, 91 bottles of beer. Take one down and pass it around, 90 bottles of beer on the wall. 90 bottles of beer on the wall, 90 bottles of beer. Take one down and pass it around, 89 bottles of beer on the wall. 89 bottles of beer on the wall, 89 bottles of beer. Take one down and pass it around, 88 bottles of beer on the wall. 88 bottles of beer on the wall, 88 bottles of beer. Take one down and pass it around, 87 bottles of beer on the wall. 87 bottles of beer on the wall, 87 bottles of beer. Take one down and pass it around, 86 bottles of beer on the wall. 86 bottles of beer on the wall, 86 bottles of beer. Take one down and pass it around, 85 bottles of beer on the wall. 85 bottles of beer on the wall, 85 bottles of beer. Take one down and pass it around, 84 bottles of beer on the wall. 84 bottles of beer on the wall, 84 bottles of beer. Take one down and pass it around, 83 bottles of beer on the wall. 83 bottles of beer on the wall, 83 bottles of beer. Take one down and pass it around, 82 bottles of beer on the wall. 82 bottles of beer on the wall, 82 bottles of beer. Take one down and pass it around, 81 bottles of beer on the wall. 81 bottles of beer on the wall, 81 bottles of beer. Take one down and pass it around, 80 bottles of beer on the wall. 80 bottles of beer on the wall, 80 bottles of beer. Take one down and pass it around, 79 bottles of beer on the wall. 79 bottles of beer on the wall, 79 bottles of beer. Take one down and pass it around, 78 bottles of beer on the wall. 78 bottles of beer on the wall, 78 bottles of beer. Take one down and pass it around, 77 bottles of beer on the wall. 77 bottles of beer on the wall, 77 bottles of beer. Take one down and pass it around, 76 bottles of beer on the wall. 76 bottles of beer on the wall, 76 bottles of beer. Take one down and pass it around, 75 bottles of beer on the wall. 75 bottles of beer on the wall, 75 bottles of beer. Take one down and pass it around, 74 bottles of beer on the wall. 74 bottles of beer on the wall, 74 bottles of beer. Take one down and pass it around, 73 bottles of beer on the wall. 73 bottles of beer on the wall, 73 bottles of beer. Take one down and pass it around, 72 bottles of beer on the wall. 72 bottles of beer on the wall, 72 bottles of beer. Take one down and pass it around, 71 bottles of beer on the wall. 71 bottles of beer on the wall, 71 bottles of beer. Take one down and pass it around, 70 bottles of beer on the wall. 70 bottles of beer on the wall, 70 bottles of beer. Take one down and pass it around, 69 bottles of beer on the wall. 69 bottles of beer on the wall, 69 bottles of beer. Take one down and pass it around, 68 bottles of beer on the wall. 68 bottles of beer on the wall, 68 bottles of beer. Take one down and pass it around, 67 bottles of beer on the wall. 67 bottles of beer on the wall, 67 bottles of beer. Take one down and pass it around, 66 bottles of beer on the wall. 66 bottles of beer on the wall, 66 bottles of beer. Take one down and pass it around, 65 bottles of beer on the wall. 65 bottles of beer on the wall, 65 bottles of beer. Take one down and pass it around, 64 bottles of beer on the wall. 64 bottles of beer on the wall, 64 bottles of beer. Take one down and pass it around, 63 bottles of beer on the wall. 63 bottles of beer on the wall, 63 bottles of beer. Take one down and pass it around, 62 bottles of beer on the wall. 62 bottles of beer on the wall, 62 bottles of beer. Take one down and pass it around, 61 bottles of beer on the wall. 61 bottles of beer on the wall, 61 bottles of beer. Take one down and pass it around, 60 bottles of beer on the wall. 60 bottles of beer on the wall, 60 bottles of beer. Take one down and pass it around, 59 bottles of beer on the wall. 59 bottles of beer on the wall, 59 bottles of beer. Take one down and pass it around, 58 bottles of beer on the wall. 58 bottles of beer on the wall, 58 bottles of beer. Take one down and pass it around, 57 bottles of beer on the wall. 57 bottles of beer on the wall, 57 bottles of beer. Take one down and pass it around, 56 bottles of beer on the wall. 56 bottles of beer on the wall, 56 bottles of beer. Take one down and pass it around, 55 bottles of beer on the wall. 55 bottles of beer on the wall, 55 bottles of beer. Take one down and pass it around, 54 bottles of beer on the wall. 54 bottles of beer on the wall, 54 bottles of beer. Take one down and pass it around, 53 bottles of beer on the wall. 53 bottles of beer on the wall, 53 bottles of beer. Take one down and pass it around, 52 bottles of beer on the wall. 52 bottles of beer on the wall, 52 bottles of beer. Take one down and pass it around, 51 bottles of beer on the wall. 51 bottles of beer on the wall, 51 bottles of beer. Take one down and pass it around, 50 bottles of beer on the wall. 50 bottles of beer on the wall, 50 bottles of beer. Take one down and pass it around, 49 bottles of beer on the wall. 49 bottles of beer on the wall, 49 bottles of beer. Take one down and pass it around, 48 bottles of beer on the wall. 48 bottles of beer on the wall, 48 bottles of beer. Take one down and pass it around, 47 bottles of beer on the wall. 47 bottles of beer on the wall, 47 bottles of beer. Take one down and pass it around, 46 bottles of beer on the wall. 46 bottles of beer on the wall, 46 bottles of beer. Take one down and pass it around, 45 bottles of beer on the wall. 45 bottles of beer on the wall, 45 bottles of beer. Take one down and pass it around, 44 bottles of beer on the wall. 44 bottles of beer on the wall, 44 bottles of beer. Take one down and pass it around, 43 bottles of beer on the wall. 43 bottles of beer on the wall, 43 bottles of beer. Take one down and pass it around, 42 bottles of beer on the wall. 42 bottles of beer on the wall, 42 bottles of beer. Take one down and pass it around, 41 bottles of beer on the wall. 41 bottles of beer on the wall, 41 bottles of beer. Take one down and pass it around, 40 bottles of beer on the wall. 40 bottles of beer on the wall, 40 bottles of beer. Take one down and pass it around, 39 bottles of beer on the wall. 39 bottles of beer on the wall, 39 bottles of beer. Take one down and pass it around, 38 bottles of beer on the wall. 38 bottles of beer on the wall, 38 bottles of beer. Take one down and pass it around, 37 bottles of beer on the wall. 37 bottles of beer on the wall, 37 bottles of beer. Take one down and pass it around, 36 bottles of beer on the wall. 36 bottles of beer on the wall, 36 bottles of beer. Take one down and pass it around, 35 bottles of beer on the wall. 35 bottles of beer on the wall, 35 bottles of beer. Take one down and pass it around, 34 bottles of beer on the wall. 34 bottles of beer on the wall, 34 bottles of beer. Take one down and pass it around, 33 bottles of beer on the wall. 33 bottles of beer on the wall, 33 bottles of beer. Take one down and pass it around, 32 bottles of beer on the wall. 32 bottles of beer on the wall, 32 bottles of beer. Take one down and pass it around, 31 bottles of beer on the wall. 31 bottles of beer on the wall, 31 bottles of beer. Take one down and pass it around, 30 bottles of beer on the wall. 30 bottles of beer on the wall, 30 bottles of beer. Take one down and pass it around, 29 bottles of beer on the wall. 29 bottles of beer on the wall, 29 bottles of beer. Take one down and pass it around, 28 bottles of beer on the wall. 28 bottles of beer on the wall, 28 bottles of beer. Take one down and pass it around, 27 bottles of beer on the wall. 27 bottles of beer on the wall, 27 bottles of beer. Take one down and pass it around, 26 bottles of beer on the wall. 26 bottles of beer on the wall, 26 bottles of beer. Take one down and pass it around, 25 bottles of beer on the wall. 25 bottles of beer on the wall, 25 bottles of beer. Take one down and pass it around, 24 bottles of beer on the wall. 24 bottles of beer on the wall, 24 bottles of beer. Take one down and pass it around, 23 bottles of beer on the wall. 23 bottles of beer on the wall, 23 bottles of beer. Take one down and pass it around, 22 bottles of beer on the wall. 22 bottles of beer on the wall, 22 bottles of beer. Take one down and pass it around, 21 bottles of beer on the wall. 21 bottles of beer on the wall, 21 bottles of beer. Take one down and pass it around, 20 bottles of beer on the wall. 20 bottles of beer on the wall, 20 bottles of beer. Take one down and pass it around, 19 bottles of beer on the wall. 19 bottles of beer on the wall, 19 bottles of beer. Take one down and pass it around, 18 bottles of beer on the wall. 18 bottles of beer on the wall, 18 bottles of beer. Take one down and pass it around, 17 bottles of beer on the wall. 17 bottles of beer on the wall, 17 bottles of beer. Take one down and pass it around, 16 bottles of beer on the wall. 16 bottles of beer on the wall, 16 bottles of beer. Take one down and pass it around, 15 bottles of beer on the wall. 15 bottles of beer on the wall, 15 bottles of beer. Take one down and pass it around, 14 bottles of beer on the wall. 14 bottles of beer on the wall, 14 bottles of beer. Take one down and pass it around, 13 bottles of beer on the wall. 13 bottles of beer on the wall, 13 bottles of beer. Take one down and pass it around, 12 bottles of beer on the wall. 12 bottles of beer on the wall, 12 bottles of beer. Take one down and pass it around, 11 bottles of beer on the wall. 11 bottles of beer on the wall, 11 bottles of beer. Take one down and pass it around, 10 bottles of beer on the wall. 10 bottles of beer on the wall, 10 bottles of beer. Take one down and pass it around, 9 bottles of beer on the wall. 9 bottles of beer on the wall, 9 bottles of beer. Take one down and pass it around, 8 bottles of beer on the wall. 8 bottles of beer on the wall, 8 bottles of beer. Take one down and pass it around, 7 bottles of beer on the wall. 7 bottles of beer on the wall, 7 bottles of beer. Take one down and pass it around, 6 bottles of beer on the wall. 6 bottles of beer on the wall, 6 bottles of beer. Take one down and pass it around, 5 bottles of beer on the wall. 5 bottles of beer on the wall, 5 bottles of beer. Take one down and pass it around, 4 bottles of beer on the wall. 4 bottles of beer on the wall, 4 bottles of beer. Take one down and pass it around, 3 bottles of beer on the wall. 3 bottles of beer on the wall, 3 bottles of beer. Take one down and pass it around, 2 bottles of beer on the wall. 2 bottles of beer on the wall, 2 bottles of beer. Take one down and pass it around, 1 bottle of beer on the wall. 1 bottle of beer on the wall, 1 bottle of beer. Take it down and pass it around, no more bottles of beer on the wall. No more bottles of beer on the wall, no more bottles of beer. Go to the store and buy some more, 99 bottles of beer on the wall. ``` ## For bonus points Did you get the tests passing and the code clean? If you want to, these are some additional things you could try: * Remove as much duplication as you possibly can. * Optimize for readability, even if it means introducing duplication. * If you've removed all the duplication, do you have a lot of conditionals? Try replacing the conditionals with polymorphism, if it applies in this language. How readable is it? Then please share your thoughts in a comment on the submission. Did this experiment make the code better? Worse? Did you learn anything from it? ## Running tests In order to run the tests, issue the following command from the exercise directory: For running the tests provided, `rebar3` is used as it is the official build and dependency management tool for erlang now. Please refer to [the tracks installation instructions](http://exercism.io/languages/erlang/installation) on how to do that. In order to run the tests, you can issue the following command from the exercise directory. ```bash $ rebar3 eunit ``` ### Test versioning Each problem defines a macro `TEST_VERSION` in the test file and verifies that the solution defines and exports a function `test_version` returning that same value. To make tests pass, add the following to your solution: ```erlang -export([test_version/0]). test_version() -> 1. ``` The benefit of this is that reviewers can see against which test version an iteration was written if, for example, a previously posted solution does not solve the current problem or passes current tests. ## Questions? For detailed information about the Erlang track, please refer to the [help page](http://exercism.io/languages/erlang) on the Exercism site. This covers the basic information on setting up the development environment expected by the exercises. ## Source Learn to Program by Chris Pine [http://pine.fm/LearnToProgram/?Chapter=06](http://pine.fm/LearnToProgram/?Chapter=06) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.