What you should learn from this project At the end of this project you are expected to be able to explain to anyone, without the help of Google:
What is the difference between automatic and dynamic allocation What is malloc and free and how to use them Why and when use malloc How to use valgrind to check for memory leak
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Float like a butterfly, sting like a bee Write a function that creates an array of chars, and initializes it with a specific char. Prototype: char *create_array(unsigned int size, char c); Returns NULL if size = 0 Returns a pointer to the array, or NULL if it fails
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The woman who has no imagination has no wings Write a function that returns a pointer to a newly allocated space in memory, which contains a copy of the string given as a parameter. Prototype: char *_strdup(char *str); The _strdup() function returns a pointer to a new string which is a duplicate of the string str. Memory for the new string is obtained with malloc, and can be freed with free. Returns NULL if str = NULL On success, the _strdup function returns a pointer to the duplicated string. It returns NULL if insufficient memory was available
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He who is not courageous enough to take risks will accomplish nothing in life Write a function that concatenates two strings. Prototype: char *str_concat(char *s1, char *s2); The returned pointer should point to a newly allocated space in memory which contains the contents of s1, followed by the contents of s2, and null terminated if NULL is passed, treat it as an empty string The function should return NULL on failure
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If you even dream of beating me you'd better wake up and apologize Write a function that returns a pointer to a 2 dimensional array of integers. Prototype: int **alloc_grid(int width, int height); Each element of the grid should be initialized to 0 The function should return NULL on failure If width or height is 0 or negative, return NULL
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It's not bragging if you can back it up Write a function that frees a 2 dimensional grid previously created by your alloc_grid function. Prototype: void free_grid(int **grid, int height); Your program should not crash if the grid is invalid (NULL or size = 0) Note that we will compile with your alloc_grid.c file. Make sure it compiles
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It isn't the mountains ahead to climb that wear you out; it's the pebble in your shoe Write a function that concatenates all the arguments of your program. Prototype: char *argstostr(int ac, char **av); Returns NULL if ac == 0 or av == NULL Returns a pointer to a new string, or NULL if it fails Each argument should be followed by a \n in the new string