From fde74403686904a77e6c0018aa8181febe5e5ca7 Mon Sep 17 00:00:00 2001 From: Dmitry Kokorin Date: Wed, 16 Mar 2016 01:21:19 +0300 Subject: [PATCH] grains: initial commit --- cpp/grains/CMakeLists.txt | 59 +++++++++++++++++++++++++++++++++++ cpp/grains/README.md | 63 ++++++++++++++++++++++++++++++++++++++ cpp/grains/grains_test.cpp | 45 +++++++++++++++++++++++++++ 3 files changed, 167 insertions(+) create mode 100644 cpp/grains/CMakeLists.txt create mode 100644 cpp/grains/README.md create mode 100644 cpp/grains/grains_test.cpp diff --git a/cpp/grains/CMakeLists.txt b/cpp/grains/CMakeLists.txt new file mode 100644 index 0000000..56a3675 --- /dev/null +++ b/cpp/grains/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/grains/README.md b/cpp/grains/README.md new file mode 100644 index 0000000..8e8e7c6 --- /dev/null +++ b/cpp/grains/README.md @@ -0,0 +1,63 @@ +# Grains + +Write a program that calculates the number of grains of wheat on a chessboard given that the number on each square doubles. + +There once was a wise servant who saved the life of a prince. The king +promised to pay whatever the servant could dream up. Knowing that the +king loved chess, the servant told the king he would like to have grains +of wheat. One grain on the first square of a chess board. Two grains on +the next. Four on the third, and so on. + +There are 64 squares on a chessboard. + +Write a program that shows: +- how many grains were on each square, and +- the total number of grains + + +## 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: + +- Optimize for speed. +- Optimize for readability. + +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? + +## 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 + +JavaRanch Cattle Drive, exercise 6 [view source](http://www.javaranch.com/grains.jsp) diff --git a/cpp/grains/grains_test.cpp b/cpp/grains/grains_test.cpp new file mode 100644 index 0000000..fa5a3a8 --- /dev/null +++ b/cpp/grains/grains_test.cpp @@ -0,0 +1,45 @@ +#include "grains.h" +#define BOOST_TEST_MAIN +#include + +BOOST_AUTO_TEST_CASE(square_1) +{ + BOOST_REQUIRE_EQUAL(1ULL, grains::square(1)); +} + +#if defined(EXERCISM_RUN_ALL_TESTS) +BOOST_AUTO_TEST_CASE(square_2) +{ + BOOST_REQUIRE_EQUAL(2ULL, grains::square(2)); +} + +BOOST_AUTO_TEST_CASE(square_3) +{ + BOOST_REQUIRE_EQUAL(4ULL, grains::square(3)); +} + +BOOST_AUTO_TEST_CASE(square_4) +{ + BOOST_REQUIRE_EQUAL(8ULL, grains::square(4)); +} + +BOOST_AUTO_TEST_CASE(square_16) +{ + BOOST_REQUIRE_EQUAL(32768ULL, grains::square(16)); +} + +BOOST_AUTO_TEST_CASE(square_32) +{ + BOOST_REQUIRE_EQUAL(2147483648ULL, grains::square(32)); +} + +BOOST_AUTO_TEST_CASE(square_64) +{ + BOOST_REQUIRE_EQUAL(9223372036854775808ULL, grains::square(64)); +} + +BOOST_AUTO_TEST_CASE(total) +{ + BOOST_REQUIRE_EQUAL(18446744073709551615ULL, grains::total()); +} +#endif