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Add 'allergies' exercise #83
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Original file line number | Diff line number | Diff line change |
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CFLAGS = -std=c99 | ||
CFLAGS += -Wall | ||
CFLAGS += -Wextra | ||
CFLAGS += -pedantic | ||
CFLAGS += -Werror | ||
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test: tests.out | ||
@./tests.out | ||
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clean: | ||
rm -f *.o *.out | ||
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tests.out: test/test_allergies.c src/allergies.c src/allergies.h | ||
@echo Compiling $@ | ||
@cc $(CFLAGS) src/allergies.c test/vendor/unity.c test/test_allergies.c -o tests.out |
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#ifndef _ALLERGIES_H | ||
#define _ALLERGIES_H | ||
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typedef enum { | ||
Allergen_Eggs = 0, | ||
Allergen_Peanuts, | ||
Allergen_Shellfish, | ||
Allergen_Strawberries, | ||
Allergen_Tomatoes, | ||
Allergen_Chocolate, | ||
Allergen_Pollen, | ||
Allergen_Cats, | ||
Allergen_Count | ||
} Allergen_t; | ||
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typedef struct { | ||
int count; | ||
Allergen_t *allergens; | ||
} Allergen_List_t; | ||
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#endif |
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#include "allergies.h" | ||
#include <stdlib.h> | ||
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static const unsigned int scores[] = { | ||
1, | ||
2, | ||
4, | ||
8, | ||
16, | ||
32, | ||
64, | ||
128 | ||
}; | ||
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bool is_allergic_to(Allergen_t allergen, unsigned int score) | ||
{ | ||
return ((score & scores[allergen]) == scores[allergen]); | ||
} | ||
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void get_allergens(unsigned int score, Allergen_List_t * list) | ||
{ | ||
list->allergens = calloc(Allergen_Count, sizeof(Allergen_t)); | ||
list->count = 0; | ||
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for (Allergen_t allergen = 0; allergen < Allergen_Count; allergen++) { | ||
if (is_allergic_to(allergen, score)) { | ||
score -= scores[allergen]; | ||
list->allergens[list->count] = allergen; | ||
list->count++; | ||
} | ||
} | ||
} |
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#ifndef _ALLERGIES_H | ||
#define _ALLERGIES_H | ||
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#include <stdbool.h> | ||
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typedef enum { | ||
Allergen_Eggs = 0, | ||
Allergen_Peanuts, | ||
Allergen_Shellfish, | ||
Allergen_Strawberries, | ||
Allergen_Tomatoes, | ||
Allergen_Chocolate, | ||
Allergen_Pollen, | ||
Allergen_Cats, | ||
Allergen_Count | ||
} Allergen_t; | ||
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typedef struct { | ||
int count; | ||
Allergen_t *allergens; | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Given that we know exactly how many allergens there are prior to declaring this type, why wouldn't we simply create a properly sized array for There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I guess leaving this as an allocation means that the implementation could potentially allocate only as many as are actually necessary for the given score. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I could go either way. I do like having the option allocate only as many as necessary. |
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} Allergen_List_t; | ||
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bool is_allergic_to(Allergen_t allergen, unsigned int score); | ||
void get_allergens(unsigned int score, Allergen_List_t * list); | ||
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#endif |
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#include "vendor/unity.h" | ||
#include "../src/allergies.h" | ||
#include <stdlib.h> | ||
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void test_list_count_is(int count, Allergen_List_t * list) | ||
{ | ||
TEST_ASSERT_EQUAL(count, list->count); | ||
} | ||
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void test_list_contains(Allergen_t allergen, Allergen_List_t * list) | ||
{ | ||
bool allergen_found = false; | ||
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for (int i = 0; i < list->count; i++) { | ||
if (list->allergens[i] == allergen) { | ||
allergen_found = true; | ||
break; | ||
} | ||
} | ||
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TEST_ASSERT_TRUE(allergen_found); | ||
} | ||
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void test_no_allergies_means_not_allergic(void) | ||
{ | ||
int score = 0; | ||
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TEST_ASSERT_FALSE(is_allergic_to(Allergen_Peanuts, score)); | ||
TEST_ASSERT_FALSE(is_allergic_to(Allergen_Cats, score)); | ||
TEST_ASSERT_FALSE(is_allergic_to(Allergen_Strawberries, score)); | ||
} | ||
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void test_is_allergic_to_eggs(void) | ||
{ | ||
int score = 1; | ||
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TEST_ASSERT_TRUE(is_allergic_to(Allergen_Eggs, score)); | ||
} | ||
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void test_is_allergic_to_eggs_in_addition_to_other_stuff(void) | ||
{ | ||
int score = 5; | ||
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TEST_ASSERT_TRUE(is_allergic_to(Allergen_Eggs, score)); | ||
TEST_ASSERT_TRUE(is_allergic_to(Allergen_Shellfish, score)); | ||
TEST_ASSERT_FALSE(is_allergic_to(Allergen_Strawberries, score)); | ||
} | ||
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void test_no_allergies_at_all(void) | ||
{ | ||
int score = 0; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(0, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_allergic_to_just_eggs(void) | ||
{ | ||
int score = 1; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(1, &list); | ||
test_list_contains(Allergen_Eggs, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_allergic_to_just_peanuts(void) | ||
{ | ||
int score = 2; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(1, &list); | ||
test_list_contains(Allergen_Peanuts, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_allergic_to_just_strawberries(void) | ||
{ | ||
int score = 8; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(1, &list); | ||
test_list_contains(Allergen_Strawberries, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_allergic_to_eggs_and_peanuts(void) | ||
{ | ||
int score = 3; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(2, &list); | ||
test_list_contains(Allergen_Eggs, &list); | ||
test_list_contains(Allergen_Peanuts, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_allergic_to_more_than_eggs_but_not_peanuts(void) | ||
{ | ||
int score = 5; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(2, &list); | ||
test_list_contains(Allergen_Eggs, &list); | ||
test_list_contains(Allergen_Shellfish, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_allergic_to_lots_of_stuff(void) | ||
{ | ||
int score = 248; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(5, &list); | ||
test_list_contains(Allergen_Strawberries, &list); | ||
test_list_contains(Allergen_Tomatoes, &list); | ||
test_list_contains(Allergen_Chocolate, &list); | ||
test_list_contains(Allergen_Pollen, &list); | ||
test_list_contains(Allergen_Cats, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_allergic_to_everything(void) | ||
{ | ||
int score = 255; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(8, &list); | ||
test_list_contains(Allergen_Eggs, &list); | ||
test_list_contains(Allergen_Peanuts, &list); | ||
test_list_contains(Allergen_Shellfish, &list); | ||
test_list_contains(Allergen_Strawberries, &list); | ||
test_list_contains(Allergen_Tomatoes, &list); | ||
test_list_contains(Allergen_Chocolate, &list); | ||
test_list_contains(Allergen_Pollen, &list); | ||
test_list_contains(Allergen_Cats, &list); | ||
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free(list.allergens); | ||
} | ||
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void test_ignore_non_allergen_score_parts(void) | ||
{ | ||
int score = 509; | ||
Allergen_List_t list; | ||
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get_allergens(score, &list); | ||
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test_list_count_is(7, &list); | ||
test_list_contains(Allergen_Eggs, &list); | ||
test_list_contains(Allergen_Shellfish, &list); | ||
test_list_contains(Allergen_Strawberries, &list); | ||
test_list_contains(Allergen_Tomatoes, &list); | ||
test_list_contains(Allergen_Chocolate, &list); | ||
test_list_contains(Allergen_Pollen, &list); | ||
test_list_contains(Allergen_Cats, &list); | ||
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free(list.allergens); | ||
} | ||
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int main(void) | ||
{ | ||
UnityBegin("test/test_allergies.c"); | ||
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RUN_TEST(test_no_allergies_means_not_allergic); | ||
RUN_TEST(test_is_allergic_to_eggs); | ||
RUN_TEST(test_is_allergic_to_eggs_in_addition_to_other_stuff); | ||
RUN_TEST(test_no_allergies_at_all); | ||
RUN_TEST(test_allergic_to_just_eggs); | ||
RUN_TEST(test_allergic_to_just_peanuts); | ||
RUN_TEST(test_allergic_to_just_strawberries); | ||
RUN_TEST(test_allergic_to_eggs_and_peanuts); | ||
RUN_TEST(test_allergic_to_more_than_eggs_but_not_peanuts); | ||
RUN_TEST(test_allergic_to_lots_of_stuff); | ||
RUN_TEST(test_allergic_to_everything); | ||
RUN_TEST(test_ignore_non_allergen_score_parts); | ||
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UnityEnd(); | ||
return 0; | ||
} |
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Looks like this guy is never initialized to 0
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Yep. I originally had
get_allergens()
mallocing the entireAllergen_List_t
and then switched to having it passed in. Will fix.