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vaengvaeng
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feat: add dnd-character exercise (#802)
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‎config.json‎

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"practices": [],
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"prerequisites": [],
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"difficulty": 7
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},
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{
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"slug": "dnd-character",
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"name": "D&D Character",
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"uuid": "83e20a67-990e-4db7-b16a-48b4f516f893",
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"practices": [],
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"prerequisites": [],
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"difficulty": 3
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}
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],
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"foregone": [

‎exercises/practice/dnd-character/.docs/instructions.md‎

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# Instructions
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For a game of [Dungeons & Dragons][dnd], each player starts by generating a character they can play with.
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This character has, among other things, six abilities; strength, dexterity, constitution, intelligence, wisdom and charisma.
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These six abilities have scores that are determined randomly.
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You do this by rolling four 6-sided dice and record the sum of the largest three dice.
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You do this six times, once for each ability.
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Your character's initial hitpoints are 10 + your character's constitution modifier.
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You find your character's constitution modifier by subtracting 10 from your character's constitution, divide by 2 and round down.
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Write a random character generator that follows the rules above.
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For example, the six throws of four dice may look like:
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- 5, 3, 1, 6: You discard the 1 and sum 5 + 3 + 6 = 14, which you assign to strength.
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- 3, 2, 5, 3: You discard the 2 and sum 3 + 5 + 3 = 11, which you assign to dexterity.
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- 1, 1, 1, 1: You discard the 1 and sum 1 + 1 + 1 = 3, which you assign to constitution.
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- 2, 1, 6, 6: You discard the 1 and sum 2 + 6 + 6 = 14, which you assign to intelligence.
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- 3, 5, 3, 4: You discard the 3 and sum 5 + 3 + 4 = 12, which you assign to wisdom.
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- 6, 6, 6, 6: You discard the 6 and sum 6 + 6 + 6 = 18, which you assign to charisma.
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Because constitution is 3, the constitution modifier is -4 and the hitpoints are 6.
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## Notes
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Most programming languages feature (pseudo-)random generators, but few programming languages are designed to roll dice.
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One such language is [Troll][troll].
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[dnd]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons
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[troll]: https://di.ku.dk/Ansatte/?pure=da%2Fpublications%2Ftroll-a-language-for-specifying-dicerolls(84a45ff0-068b-11df-825d-000ea68e967b)%2Fexport.html

‎exercises/practice/dnd-character/.meta/config.json‎

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{
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"authors": [
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"vaeng"
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],
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"files": {
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"solution": [
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"dnd_character.cpp",
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"dnd_character.h"
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],
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"test": [
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"dnd_character_test.cpp"
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],
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"example": [
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".meta/example.cpp",
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".meta/example.h"
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]
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},
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"blurb": "Randomly generate Dungeons & Dragons characters.",
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"source": "Simon Shine, Erik Schierboom",
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"source_url": "https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945"
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}

‎exercises/practice/dnd-character/.meta/example.cpp‎

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#include "dnd_character.h"
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#include <cmath>
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#include <cstdlib>
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namespace dnd_character {
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int modifier(int score) {
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return std::floor((static_cast<double>(score) - 10) / 2);
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}
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int dice_roll() { return 1 + std::rand() / ((RAND_MAX + 1u) / 6); }
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// Throwing three dice is not the same as selecting a random number between 3
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// and 18.
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int ability() { return dice_roll() + dice_roll() + dice_roll(); }
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} // namespace dnd_character

‎exercises/practice/dnd-character/.meta/example.h‎

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#pragma once
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namespace dnd_character {
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int modifier(int score);
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int ability();
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struct Character {
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Character() {
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strength = ability();
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dexterity = ability();
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constitution = ability();
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intelligence = ability();
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wisdom = ability();
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charisma = ability();
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hitpoints = 10 + modifier(constitution);
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};
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int strength;
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int dexterity;
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int constitution;
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int intelligence;
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int wisdom;
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int charisma;
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int hitpoints;
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};
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} // namespace dnd_character

‎exercises/practice/dnd-character/.meta/tests.toml‎

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37]
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description = "ability modifier -> ability modifier for score 3 is -4"
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[cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c]
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description = "ability modifier -> ability modifier for score 4 is -3"
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[5b519fcd-6946-41ee-91fe-34b4f9808326]
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description = "ability modifier -> ability modifier for score 5 is -3"
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[dc2913bd-6d7a-402e-b1e2-6d568b1cbe21]
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description = "ability modifier -> ability modifier for score 6 is -2"
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[099440f5-0d66-4b1a-8a10-8f3a03cc499f]
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description = "ability modifier -> ability modifier for score 7 is -2"
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[cfda6e5c-3489-42f0-b22b-4acb47084df0]
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description = "ability modifier -> ability modifier for score 8 is -1"
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[c70f0507-fa7e-4228-8463-858bfbba1754]
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description = "ability modifier -> ability modifier for score 9 is -1"
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[6f4e6c88-1cd9-46a0-92b8-db4a99b372f7]
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description = "ability modifier -> ability modifier for score 10 is 0"
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[e00d9e5c-63c8-413f-879d-cd9be9697097]
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description = "ability modifier -> ability modifier for score 11 is 0"
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[eea06f3c-8de0-45e7-9d9d-b8cab4179715]
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description = "ability modifier -> ability modifier for score 12 is +1"
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[9c51f6be-db72-4af7-92ac-b293a02c0dcd]
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description = "ability modifier -> ability modifier for score 13 is +1"
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[94053a5d-53b6-4efc-b669-a8b5098f7762]
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description = "ability modifier -> ability modifier for score 14 is +2"
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[8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2]
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description = "ability modifier -> ability modifier for score 15 is +2"
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[c3ec871e-1791-44d0-b3cc-77e5fb4cd33d]
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description = "ability modifier -> ability modifier for score 16 is +3"
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[3d053cee-2888-4616-b9fd-602a3b1efff4]
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description = "ability modifier -> ability modifier for score 17 is +3"
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[bafd997a-e852-4e56-9f65-14b60261faee]
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description = "ability modifier -> ability modifier for score 18 is +4"
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[4f28f19c-2e47-4453-a46a-c0d365259c14]
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description = "random ability is within range"
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[385d7e72-864f-4e88-8279-81a7d75b04ad]
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description = "random character is valid"
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[2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe]
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description = "each ability is only calculated once"
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include = false
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[dca2b2ec-f729-4551-84b9-078876bb4808]
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description = "each ability is only calculated once"
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reimplements = "2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe"

‎exercises/practice/dnd-character/CMakeLists.txt‎

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# Get the exercise name from the current directory
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get_filename_component(exercise ${CMAKE_CURRENT_SOURCE_DIR} NAME)
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# Basic CMake project
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cmake_minimum_required(VERSION 3.5.1)
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# Name the project after the exercise
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project(${exercise} CXX)
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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 ${file}.cpp)
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else()
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set(exercise_cpp "")
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endif()
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# Use the common Catch library?
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if(EXERCISM_COMMON_CATCH)
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# For Exercism track development only
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add_executable(${exercise} ${file}_test.cpp ${exercise_cpp} ${file}.h $<TARGET_OBJECTS:catchlib>)
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elseif(EXERCISM_TEST_SUITE)
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# The Exercism test suite is being run, the Docker image already
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# includes a pre-built version of Catch.
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find_package(Catch2 REQUIRED)
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add_executable(${exercise} ${file}_test.cpp ${exercise_cpp} ${file}.h)
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target_link_libraries(${exercise} PRIVATE Catch2::Catch2WithMain)
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# When Catch is installed system wide we need to include a different
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# header, we need this define to use the correct one.
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target_compile_definitions(${exercise} PRIVATE EXERCISM_TEST_SUITE)
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else()
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# Build executable from sources and headers
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add_executable(${exercise} ${file}_test.cpp ${exercise_cpp} ${file}.h test/tests-main.cpp)
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endif()
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set_target_properties(${exercise} PROPERTIES
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CXX_STANDARD 17
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CXX_STANDARD_REQUIRED OFF
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CXX_EXTENSIONS OFF
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)
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set(CMAKE_BUILD_TYPE Debug)
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if("${CMAKE_CXX_COMPILER_ID}" MATCHES "(GNU|Clang)")
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set_target_properties(${exercise} PROPERTIES
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COMPILE_FLAGS "-Wall -Wextra -Wpedantic -Werror"
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)
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endif()
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# Configure to run all the tests?
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if(${EXERCISM_RUN_ALL_TESTS})
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target_compile_definitions(${exercise} PRIVATE EXERCISM_RUN_ALL_TESTS)
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endif()
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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_target(test_${exercise} ALL DEPENDS ${exercise} COMMAND ${exercise})

‎exercises/practice/dnd-character/dnd_character.cpp‎

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#include "dnd_character.h"
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namespace dnd_character {
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} // namespace dnd_character

‎exercises/practice/dnd-character/dnd_character.h‎

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#pragma once
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namespace dnd_character {
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} // namespace dnd_character

‎exercises/practice/dnd-character/dnd_character_test.cpp‎

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#include "dnd_character.h"
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#ifdef EXERCISM_TEST_SUITE
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#include <catch2/catch.hpp>
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#else
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#include "test/catch.hpp"
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#endif
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TEST_CASE("ability modifier for score 3 is -4", "[1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37]") {
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REQUIRE(-4 == dnd_character::modifier(3));
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}
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#if defined(EXERCISM_RUN_ALL_TESTS)
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TEST_CASE("ability modifier for score 4 is -3", "[cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c]") {
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REQUIRE(-3 == dnd_character::modifier(4));
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}
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TEST_CASE("ability modifier for score 5 is -3", "[5b519fcd-6946-41ee-91fe-34b4f9808326]") {
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REQUIRE(-3 == dnd_character::modifier(5));
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}
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TEST_CASE("ability modifier for score 6 is -2", "[dc2913bd-6d7a-402e-b1e2-6d568b1cbe21]") {
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REQUIRE(-2 == dnd_character::modifier(6));
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}
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TEST_CASE("ability modifier for score 7 is -2", "[099440f5-0d66-4b1a-8a10-8f3a03cc499f]") {
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REQUIRE(-2 == dnd_character::modifier(7));
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}
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TEST_CASE("ability modifier for score 8 is -1", "[cfda6e5c-3489-42f0-b22b-4acb47084df0]") {
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REQUIRE(-1 == dnd_character::modifier(8));
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}
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TEST_CASE("ability modifier for score 9 is -1", "[c70f0507-fa7e-4228-8463-858bfbba1754]") {
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REQUIRE(-1 == dnd_character::modifier(9));
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}
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TEST_CASE("ability modifier for score 10 is 0", "[6f4e6c88-1cd9-46a0-92b8-db4a99b372f7]") {
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REQUIRE(0 == dnd_character::modifier(10));
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}
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TEST_CASE("ability modifier for score 11 is 0", "[e00d9e5c-63c8-413f-879d-cd9be9697097]") {
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REQUIRE(0 == dnd_character::modifier(11));
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}
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TEST_CASE("ability modifier for score 12 is +1", "[eea06f3c-8de0-45e7-9d9d-b8cab4179715]") {
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REQUIRE(1 == dnd_character::modifier(12));
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}
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TEST_CASE("ability modifier for score 13 is +1", "[9c51f6be-db72-4af7-92ac-b293a02c0dcd]") {
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REQUIRE(1 == dnd_character::modifier(13));
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}
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TEST_CASE("ability modifier for score 14 is +2", "[94053a5d-53b6-4efc-b669-a8b5098f7762]") {
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REQUIRE(2 == dnd_character::modifier(14));
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}
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TEST_CASE("ability modifier for score 15 is +2", "[8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2]") {
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REQUIRE(2 == dnd_character::modifier(15));
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}
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TEST_CASE("ability modifier for score 16 is +3", "[c3ec871e-1791-44d0-b3cc-77e5fb4cd33d]") {
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REQUIRE(3 == dnd_character::modifier(16));
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}
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TEST_CASE("ability modifier for score 17 is +3", "[3d053cee-2888-4616-b9fd-602a3b1efff4]") {
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REQUIRE(3 == dnd_character::modifier(17));
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}
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TEST_CASE("ability modifier for score 18 is +4", "[bafd997a-e852-4e56-9f65-14b60261faee]") {
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REQUIRE(4 == dnd_character::modifier(18));
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}
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TEST_CASE("random ability is within range", "[4f28f19c-2e47-4453-a46a-c0d365259c14]") {
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int result{dnd_character::ability()};
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//REQUIRE("score >= 3 && score <= 18" == dnd_character::ability());
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REQUIRE((result >= 3 && result <= 18));
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}
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TEST_CASE("random character is valid", "[385d7e72-864f-4e88-8279-81a7d75b04ad]") {
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dnd_character::Character character;
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REQUIRE((character.strength >= 3 && character.strength <= 18));
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REQUIRE((character.dexterity >= 3 && character.dexterity <= 18));
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REQUIRE((character.constitution >= 3 && character.constitution <= 18));
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REQUIRE((character.intelligence >= 3 && character.intelligence <= 18));
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REQUIRE((character.wisdom >= 3 && character.wisdom <= 18));
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REQUIRE((character.charisma >= 3 && character.charisma <= 18));
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REQUIRE(character.hitpoints == 10 + dnd_character::modifier(character.constitution));
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}
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TEST_CASE("each ability is only calculated once", "[dca2b2ec-f729-4551-84b9-078876bb4808]") {
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dnd_character::Character character;
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REQUIRE(character.strength == character.strength);
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REQUIRE(character.dexterity == character.dexterity);
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REQUIRE(character.constitution == character.constitution);
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REQUIRE(character.intelligence == character.intelligence);
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REQUIRE(character.wisdom == character.wisdom);
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REQUIRE(character.charisma == character.charisma);
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}
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#endif

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