0x0E-structures_typedef

0x0E-structures_typedef Project

In this project, I learned about using structures and typedef in C.

Header File 📁

dog.h: Header file containing definitions and prototypes for all types and functions written in the project. Type/File Defintion/Prototype struct dog char *name float age char *owner typedef dog_t struct dog 1-init_dog.c void init_dog(struct dog *d, char *name, float age, char *owner); 2-print_dog.c void print_dog(struct dog *d); 4-new_dog.c dog_t *new_dog(char *name, float age, char *owner); 5-free_dog.c void free_dog(dog_t *d);

Tasks 📃

0. Django

dog.h: Header file that defines a new type struct dog with the following elements:

• char *name
• float age
• char *owner

Resource

• 0x0d. Structures
• struct (C programming Language)
• struct memory layout in C
• Betty Documentation Style: Data Structures
• 0x0d typedef
• typedef
• Programming in C by Stephen Kochan Chapter 8, working with Structures pg 163-189 - stephen g. kochan(1).pdf)
• More on structs
• The Lost Art of C Structure Packing Advanced, not mandatory

Tasks

0. Poppy : A new type struct dog with the following elements.
   • name, type = char *
   • age, type = float
   • owner, type = char *
   • Compile the code this way: gcc -Wall -pedantic -Werror -Wextra -std=gnu89 0-main.c -o a

1. A dog is the only thing on earth that loves you more than you love yourself : A function that initialize a variable of type struct dog
   • Prototype: void init_dog(struct dog *d, char *name, float age, char *owner);
   • Compile the code this way: gcc -Wall -pedantic -Werror -Wextra -std=gnu89 1-main.c 1-init_dog.c -o b

2. A dog will teach you unconditional love. If you can have that in your life, things won't be too bad : A function that prints a struct dog
   • Prototype: void print_dog(struct dog *d);
   • Format: see example below.
   • You are allowed to use the standard library.
   • If an element of d is NULL, print (nil) instead of this element. (if name is NULL, print Name: (nil))
   • If d is NULL print nothing.
   • Compile the code this way: gcc -Wall -pedantic -Werror -Wextra -std=gnu89 2-main.c 2-print_dog.c -o c

3. Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read : Define a new type dog_t as a new name for the type struct dog
   • Compile the code this way: gcc -Wall -pedantic -Werror -Wextra -std=gnu89 3-main.c -o d

4. A door is what a dog is perpetually on the wrong side of : A function that creates a new dog.
   • Prototype: dog_t *new_dog(char *name, float age, char *owner);
   • You have to store a copy of name and owner
   • Return NULL if the function fails.
   • Compile the code this way: gcc -Wall -pedantic -Werror -Wextra -std=gnu89 4-main.c 4-new_dog.c -o e

5. How many legs does a dog have if you call his tail a leg? Four. Saying that a tail is a leg doesn't make it a leg : A function that frees dogs.
   • Prototype: void free_dog(dog_t *d);
   • Compile the code this way: gcc -Wall -pedantic -Werror -Wextra -std=gnu89 5-main.c 5-free_dog.c 4-new_dog.c -o f
   • Run the code this way: valgrind ./f