food-chain: initial commit
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52
cpp/food-chain/CMakeLists.txt
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52
cpp/food-chain/CMakeLists.txt
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# Get the exercise name from the current directory
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get_filename_component(exercise ${CMAKE_CURRENT_SOURCE_DIR} NAME)
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# Basic CMake project
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cmake_minimum_required(VERSION 2.8.11)
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# Name the project after the exercise
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project(${exercise} CXX)
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# Locate Boost libraries: unit_test_framework, date_time and regex
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set(Boost_USE_STATIC_LIBS ON)
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set(Boost_USE_MULTITHREADED ON)
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set(Boost_USE_STATIC_RUNTIME OFF)
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find_package(Boost 1.55 REQUIRED COMPONENTS unit_test_framework date_time regex)
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# Enable C++11 features on gcc/clang
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if("${CMAKE_CXX_COMPILER_ID}" MATCHES "(GNU|Clang)")
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set(CMAKE_CXX_FLAGS "-std=c++11")
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endif()
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# Configure to run all the tests?
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if(${EXERCISM_RUN_ALL_TESTS})
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add_definitions(-DEXERCISM_RUN_ALL_TESTS)
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endif()
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# Get a source filename from the exercise name by replacing -'s with _'s
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string(REPLACE "-" "_" file ${exercise})
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# Implementation could be only a header
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if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${file}.cpp)
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set(exercise_cpp ${file}.cpp)
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else()
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set(exercise_cpp "")
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endif()
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# Build executable from sources and headers
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add_executable(${exercise} ${file}_test.cpp ${exercise_cpp} ${file}.h)
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# We need boost includes
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target_include_directories(${exercise} PRIVATE ${Boost_INCLUDE_DIRS})
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# We need boost libraries
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target_link_libraries(${exercise} ${Boost_LIBRARIES})
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# Tell MSVC not to warn us about unchecked iterators in debug builds
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if(${MSVC})
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set_target_properties(${exercise} PROPERTIES
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COMPILE_DEFINITIONS_DEBUG _SCL_SECURE_NO_WARNINGS)
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endif()
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# Run the tests on every build
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add_custom_command(TARGET ${exercise} POST_BUILD COMMAND ${exercise})
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102
cpp/food-chain/README.md
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102
cpp/food-chain/README.md
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# Food Chain
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Write a program that generates the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'
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Write a program that generates the lyrics to the song
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"I know an old lady who swallowed a fly". While you could
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copy/paste the lyrics, or read them from a file, this
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problem is much more interesting if you approach it
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algorithmically.
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This is a [cumulative song](http://en.wikipedia.org/wiki/Cumulative_song) of unknown origin.
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This is one of many common variants.
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```plain
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I know an old lady who swallowed a fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a spider.
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It wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a bird.
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How absurd to swallow a bird!
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a cat.
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Imagine that, to swallow a cat!
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a dog.
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What a hog, to swallow a dog!
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She swallowed the dog to catch the cat.
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a goat.
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Just opened her throat and swallowed a goat!
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She swallowed the goat to catch the dog.
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She swallowed the dog to catch the cat.
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a cow.
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I don't know how she swallowed a cow!
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She swallowed the cow to catch the goat.
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She swallowed the goat to catch the dog.
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She swallowed the dog to catch the cat.
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a horse.
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She's dead, of course!
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```
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## Getting Started
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Make sure you have read the [getting started with C++](http://help.exercism.io/getting-started-with-cpp.html)
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page on the [exercism help site](http://help.exercism.io/). This covers
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the basic information on setting up the development environment expected
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by the exercises.
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## Passing the Tests
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Get the first test compiling, linking and passing by following the [three
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rules of test-driven development](http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd).
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Create just enough structure by declaring namespaces, functions, classes,
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etc., to satisfy any compiler errors and get the test to fail. Then write
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just enough code to get the test to pass. Once you've done that,
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uncomment the next test by moving the following line past the next test.
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```C++
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#if defined(EXERCISM_RUN_ALL_TESTS)
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```
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This may result in compile errors as new constructs may be invoked that
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you haven't yet declared or defined. Again, fix the compile errors minimally
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to get a failing test, then change the code minimally to pass the test,
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refactor your implementation for readability and expressiveness and then
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go on to the next test.
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Try to use standard C++11 facilities in preference to writing your own
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low-level algorithms or facilities by hand. [CppReference](http://en.cppreference.com/)
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is a wiki reference to the C++ language and standard library. If you
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are new to C++, but have programmed in C, beware of
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[C traps and pitfalls](http://www.slideshare.net/LegalizeAdulthood/c-traps-and-pitfalls-for-c-programmers).
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## Source
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Wikipedia [view source](http://en.wikipedia.org/wiki/There_Was_an_Old_Lady_Who_Swallowed_a_Fly)
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122
cpp/food-chain/food_chain_test.cpp
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122
cpp/food-chain/food_chain_test.cpp
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#include "food_chain.h"
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#define BOOST_TEST_MAIN
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#include <boost/test/unit_test.hpp>
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using namespace std;
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BOOST_AUTO_TEST_CASE(fly)
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{
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string expected = "I know an old lady who swallowed a fly.\n"
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"I don't know why she swallowed the fly. Perhaps she'll die.\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(1));
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}
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#if defined(EXERCISM_RUN_ALL_TESTS)
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BOOST_AUTO_TEST_CASE(spider)
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{
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string expected = "I know an old lady who swallowed a spider.\n"
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"It wriggled and jiggled and tickled inside her.\n"
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"She swallowed the spider to catch the fly.\n"
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"I don't know why she swallowed the fly. Perhaps she'll die.\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(2));
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}
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BOOST_AUTO_TEST_CASE(bird)
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{
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string expected = "I know an old lady who swallowed a bird.\n"
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"How absurd to swallow a bird!\n"
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"She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n"
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"She swallowed the spider to catch the fly.\n"
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"I don't know why she swallowed the fly. Perhaps she'll die.\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(3));
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}
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BOOST_AUTO_TEST_CASE(cat)
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{
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string expected = "I know an old lady who swallowed a cat.\n"
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"Imagine that, to swallow a cat!\n"
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"She swallowed the cat to catch the bird.\n"
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"She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n"
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"She swallowed the spider to catch the fly.\n"
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"I don't know why she swallowed the fly. "
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"Perhaps she'll die.\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(4));
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}
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BOOST_AUTO_TEST_CASE(dog)
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{
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string expected = "I know an old lady who swallowed a dog.\n"
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"What a hog, to swallow a dog!\n"
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"She swallowed the dog to catch the cat.\n"
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"She swallowed the cat to catch the bird.\n"
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"She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n"
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"She swallowed the spider to catch the fly.\n"
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"I don't know why she swallowed the fly. "
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"Perhaps she'll die.\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(5));
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}
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BOOST_AUTO_TEST_CASE(goat)
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{
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string expected = "I know an old lady who swallowed a goat.\n"
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"Just opened her throat and swallowed a goat!\n"
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"She swallowed the goat to catch the dog.\n"
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"She swallowed the dog to catch the cat.\n"
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"She swallowed the cat to catch the bird.\n"
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"She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n"
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"She swallowed the spider to catch the fly.\n"
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"I don't know why she swallowed the fly. "
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"Perhaps she'll die.\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(6));
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}
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BOOST_AUTO_TEST_CASE(cow)
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{
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string expected = "I know an old lady who swallowed a cow.\n"
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"I don't know how she swallowed a cow!\n"
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"She swallowed the cow to catch the goat.\n"
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"She swallowed the goat to catch the dog.\n"
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"She swallowed the dog to catch the cat.\n"
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"She swallowed the cat to catch the bird.\n"
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"She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n"
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"She swallowed the spider to catch the fly.\n"
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"I don't know why she swallowed the fly. "
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"Perhaps she'll die.\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(7));
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}
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BOOST_AUTO_TEST_CASE(horse)
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{
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string expected = "I know an old lady who swallowed a horse.\n"
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"She's dead, of course!\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verse(8));
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}
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BOOST_AUTO_TEST_CASE(multiple_verses)
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{
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string expected =
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"I know an old lady who swallowed a fly.\n"
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"I don't know why she swallowed the fly. Perhaps she'll die.\n"
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"\n"
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"I know an old lady who swallowed a spider.\n"
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"It wriggled and jiggled and tickled inside her.\n"
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"She swallowed the spider to catch the fly.\n"
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"I don't know why she swallowed the fly. Perhaps she'll die.\n"
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"\n";
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BOOST_REQUIRE_EQUAL(expected, food_chain::verses(1, 2));
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}
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BOOST_AUTO_TEST_CASE(the_whole_song)
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{
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BOOST_REQUIRE_EQUAL(food_chain::verses(1, 8), food_chain::sing());
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}
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#endif
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