The example contains declaring a new enumeration type, declaring an enum type variable, using enums in a switch statement, passing an enum to a function as well as a function returning an enum value.<\/p>\n
#include <stdio.h>\r\n#include <stdlib.h>\r\n#include <stdbool.h>\r\n#include <string.h>\r\n\r\n#define STR_MAX 128\r\n#define FMT_LEN 16\r\n\r\n#define LIST_BIRDS {\"Eagle\", \"Peacock\", \"Flamingo\", \"Cockatoo\", \"Albatross\", \\\r\n \"Seagul\", \"Pigeon\", \"Passer\"}\r\n#define LIST_PLANES {\"Antonov AN-225\", \"The Wright Flyer\", \"Airbus A380\",\\\r\n \"Boeing 747-400\", \"Concorde\"}\r\n#define SUPERMAN \"Clark Kent\"\r\n\r\nenum FlyingObject {OBJ_BIRD, OBJ_PLANE, OBJ_SUPERMAN, OBJ_UFO};\r\n\r\nvoid PromptString(char *prompt, char *str, int max);\r\nenum FlyingObject IdentifyObjectType(char *str);\r\nvoid PrintObjectType(enum FlyingObject obj);\r\nbool IsTypeOfObject(const char *listOfObjects[], int n, char *object);\r\n\r\nint main(void)\r\n{\r\n char sNameOfObject[STR_MAX];\r\n PromptString(\"What object did you see in the sky?\", sNameOfObject, STR_MAX);\r\n \r\n enum FlyingObject eTypeOfObject = IdentifyObjectType(sNameOfObject);\r\n\r\n PrintObjectType(eTypeOfObject);\r\n \r\n return EXIT_SUCCESS;\r\n}\r\n\r\n\/**\r\n * Description: Prints the prompt and stores reads a string from stdin in str,\r\n * maximum length of max. Input longer than max is left in stdin.\r\n * \r\n * Parameters: prompt - question printed before reading input\r\n * str - user answer is stored in here\r\n * max - maximum length of user answer.\r\n * \r\n * Return: none\r\n *\/\r\nvoid PromptString(char *prompt, char *str, int max)\r\n{\r\n puts(prompt);\r\n \r\n \/\/ Prepare input format\r\n char fmt[FMT_LEN];\r\n sprintf(fmt, \"%%%d[^\\n]s\", max);\r\n \r\n scanf(fmt, str);\r\n}\r\n\r\n\r\n\/**\r\n * Description: Identifies the type of flying object based on preset lists.\r\n * \r\n * Parameters: str - name of the flying object to identify\r\n * \r\n * Return: type of flying object\r\n *\/\r\nenum FlyingObject IdentifyObjectType(char *str)\r\n{\r\n const char *birds[] = LIST_BIRDS;\r\n const char *planes[] = LIST_PLANES;\r\n \r\n int nBirds = sizeof(birds) \/ sizeof(char *);\r\n if (IsTypeOfObject(birds, nBirds, str))\r\n return OBJ_BIRD;\r\n \r\n int nPlanes = sizeof(planes) \/ sizeof(char *);\r\n if (IsTypeOfObject(planes, nPlanes, str))\r\n return OBJ_PLANE;\r\n \r\n if (!strcmp(SUPERMAN, str))\r\n return OBJ_SUPERMAN;\r\n \r\n return OBJ_UFO;\r\n}\r\n\r\n\/**\r\n * Description: Checks if a string is part of a list\r\n * \r\n * Parameters: listOfObjects - list of strings to compare against\r\n * n - number of strings in listOfObjects\r\n * object - string to check if it is a part of the list\r\n * \r\n * Return: true if it's part of the list, false if not\r\n *\/\r\nbool IsTypeOfObject(const char *listOfObjects[], int n, char *object)\r\n{\r\n for (int i = 0; i < n; i++)\r\n {\r\n if (!strcmp(listOfObjects[i], object))\r\n return true;\r\n }\r\n return false;\r\n}\r\n\r\n\/**\r\n * Description: Prints the type of object from the enumerated list\r\n * \r\n * Parameters: obj - numerated identifier for the object to print\r\n * \r\n * Return: none\r\n *\/\r\nvoid PrintObjectType(enum FlyingObject obj)\r\n{\r\n \/\/ Cheap puns ahead..\r\n \r\n switch (obj)\r\n {\r\n case OBJ_BIRD:\r\n printf(\"It's a bird... \");\r\n break;\r\n case OBJ_PLANE:\r\n printf(\"It's a plane... \");\r\n \/\/ break;\r\n case OBJ_SUPERMAN:\r\n printf(\"It's superman!\");\r\n \/\/ break;\r\n case OBJ_UFO:\r\n printf(\"Unknown flying object or invalid input!\");\r\n break;\r\n }\r\n putchar('\\n');\r\n}\r\n<\/pre>\n <\/p>\n","protected":false},"excerpt":{"rendered":"
The example contains declaring a new enumeration type, declaring an enum type variable, using enums in a switch statement, passing an enum to a function as well as a function returning an enum value. #include <stdio.h> #include <stdlib.h> #include <stdbool.h> #include <string.h> #define STR_MAX 128 #define FMT_LEN 16 #define LIST_BIRDS {“Eagle”, “Peacock”, “Flamingo”, “Cockatoo”, “Albatross”, … Loe edasi Identifying a flying object (enumeration example)<\/span>