diff --git a/cpp/sieve/CMakeLists.txt b/cpp/sieve/CMakeLists.txt new file mode 100644 index 0000000..56a3675 --- /dev/null +++ b/cpp/sieve/CMakeLists.txt @@ -0,0 +1,59 @@ +# Get the exercise name from the current directory +get_filename_component(exercise ${CMAKE_CURRENT_SOURCE_DIR} NAME) + +# Basic CMake project +cmake_minimum_required(VERSION 2.8.11) + +# Name the project after the exercise +project(${exercise} CXX) + +# Locate Boost libraries: unit_test_framework, date_time and regex +set(Boost_USE_STATIC_LIBS ON) +set(Boost_USE_MULTITHREADED ON) +set(Boost_USE_STATIC_RUNTIME OFF) +find_package(Boost 1.55 REQUIRED COMPONENTS unit_test_framework date_time regex) + +# Enable C++11 features on gcc/clang +if("${CMAKE_CXX_COMPILER_ID}" MATCHES "(GNU|Clang)") + set(CMAKE_CXX_FLAGS "-std=c++11") +endif() + +# Configure to run all the tests? +if(${EXERCISM_RUN_ALL_TESTS}) + add_definitions(-DEXERCISM_RUN_ALL_TESTS) +endif() + +# Get a source filename from the exercise name by replacing -'s with _'s +string(REPLACE "-" "_" file ${exercise}) + +# Implementation could be only a header +if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${file}.cpp) + set(exercise_cpp ${file}.cpp) +else() + set(exercise_cpp "") +endif() + +# Include a test helper header if it exists +if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/require_equal_containers.h) + set(test_helper require_equal_containers.h) +else() + set(test_helper "") +endif() + +# Build executable from sources and headers +add_executable(${exercise} ${file}_test.cpp ${test_helper} ${exercise_cpp} ${file}.h) + +# We need boost includes +target_include_directories(${exercise} PRIVATE ${Boost_INCLUDE_DIRS}) + +# We need boost libraries +target_link_libraries(${exercise} ${Boost_LIBRARIES}) + +# Tell MSVC not to warn us about unchecked iterators in debug builds +if(${MSVC}) + set_target_properties(${exercise} PROPERTIES + COMPILE_DEFINITIONS_DEBUG _SCL_SECURE_NO_WARNINGS) +endif() + +# Run the tests on every build +add_custom_command(TARGET ${exercise} POST_BUILD COMMAND ${exercise}) diff --git a/cpp/sieve/README.md b/cpp/sieve/README.md new file mode 100644 index 0000000..62047a5 --- /dev/null +++ b/cpp/sieve/README.md @@ -0,0 +1,63 @@ +# Sieve + +Write a program that uses the Sieve of Eratosthenes to find all the primes from 2 up to a given number. + +The Sieve of Eratosthenes is a simple, ancient algorithm for finding all +prime numbers up to any given limit. It does so by iteratively marking as +composite (i.e. not prime) the multiples of each prime, +starting with the multiples of 2. + +Create your range, starting at two and continuing up to and including the given limit. (i.e. [2, limit]) + +The algorithm consists of repeating the following over and over: + +- take the next available unmarked number in your list (it is prime) +- mark all the multiples of that number (they are not prime) + +Repeat until you have processed each number in your range. + +When the algorithm terminates, all the numbers in the list that have not +been marked are prime. + +The wikipedia article has a useful graphic that explains the algorithm: +https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes + +Notice that this is a very specific algorithm, and the tests don't check +that you've implemented the algorithm, only that you've come up with the +correct list of primes. + +## Getting Started + +Make sure you have read the [getting started with C++](http://help.exercism.io/getting-started-with-cpp.html) +page on the [exercism help site](http://help.exercism.io/). This covers +the basic information on setting up the development environment expected +by the exercises. + +## Passing the Tests + +Get the first test compiling, linking and passing by following the [three +rules of test-driven development](http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd). +Create just enough structure by declaring namespaces, functions, classes, +etc., to satisfy any compiler errors and get the test to fail. Then write +just enough code to get the test to pass. Once you've done that, +uncomment the next test by moving the following line past the next test. + +```C++ +#if defined(EXERCISM_RUN_ALL_TESTS) +``` + +This may result in compile errors as new constructs may be invoked that +you haven't yet declared or defined. Again, fix the compile errors minimally +to get a failing test, then change the code minimally to pass the test, +refactor your implementation for readability and expressiveness and then +go on to the next test. + +Try to use standard C++11 facilities in preference to writing your own +low-level algorithms or facilities by hand. [CppReference](http://en.cppreference.com/) +is a wiki reference to the C++ language and standard library. If you +are new to C++, but have programmed in C, beware of +[C traps and pitfalls](http://www.slideshare.net/LegalizeAdulthood/c-traps-and-pitfalls-for-c-programmers). + +## Source + +Sieve of Eratosthenes at Wikipedia [view source](http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes) diff --git a/cpp/sieve/sieve_test.cpp b/cpp/sieve/sieve_test.cpp new file mode 100644 index 0000000..b602efb --- /dev/null +++ b/cpp/sieve/sieve_test.cpp @@ -0,0 +1,37 @@ +#include "sieve.h" +#define BOOST_TEST_MAIN +#include + +BOOST_AUTO_TEST_CASE(primes_up_to_10) +{ + const std::vector expected{2, 3, 5, 7}; + + const std::vector actual = sieve::primes(10); + + BOOST_REQUIRE_EQUAL_COLLECTIONS(expected.begin(), expected.end(), actual.begin(), actual.end()); +} + +#if defined(EXERCISM_RUN_ALL_TESTS) +BOOST_AUTO_TEST_CASE(primes_up_to_1000) +{ + const std::vector expected{ + 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, + 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, + 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, + 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, + 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, + 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, + 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, + 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, + 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, + 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, + 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, + 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, + 967, 971, 977, 983, 991, 997 + }; + + const std::vector actual = sieve::primes(1000); + + BOOST_REQUIRE_EQUAL_COLLECTIONS(expected.begin(), expected.end(), actual.begin(), actual.end()); +} +#endif