C - Function pointers
In this project, I learned about function pointers in C - what they hold, where they point in virtual memory, and how to use them. Tests heavy_check_mark
tests: Folder of test files. Provided by Holberton School.
Header Files file_folder
function_pointers.h: Header file containing prototypes for all functions written for programs 0-2 of the project.
File Prototype 0-print_name.c void print_name(char *name, void (*f)(char *)); 1-array_iterator.c void array_iterator(int *array, size_t size, void (*action)(int)); 2-int_index.c int int_index(int *array, int size, int (*cmp)(int));
3-calc.h: Header file containing definitions and prototypes for all types and function written for the program 3-main.c.
Type/File Definition/Prototypes struct op
char *op
int (*f)(int a, int b)
typedef op_t struct op 3-op_functions.c
int op_add(int a, int b);
int op_sub(int a, int b);
int op_mul(int a, int b);
int op_div(int a, int b);
int op_mod(int a, int b);
3-get_op_func.c int (*get_op_func(char *s))(int, int); Tasks page_with_curl
0. What's my name
0-print_name.c: C function that prints a name.
1. If you spend too much time thinking about a thing, you'll never get it done
1-array_iterator.c: C function that executes a function given as a parameter on each element of an array.
2. To hell with circumstances; I create opportunities
2-int_index.c: C function that searches for an integer.
Returns the index of the first element for which the cmp function does not return 0.
If no element is matched or size <= 0, the function returns -1.
3. A goal is not always meant to be reached, it often serves simply as something to aim at
3-op_functions.c: File containing the following five functions:
op_add: Returns the sum of a and b.
op_sub: Returns the difference of a and b.
op_mul: Returns the product of a and b.
op_div: Returns the division of a by b.
op_mod: Returns the remainder of the division of a by b.
3-get_op_func.c: C function that selects the correct function from 3-op_functions.c to perform the operation asked by the user.
If the operator argument s does not match any of the five expected operators (+, -, *, /, %), the function returns NULL.
3-main.c: C program that performs simple mathematical operations.
Prints the result of the operation, followed by a new line.
Usage ./a.out num1 operator num2
The program assumes num1 and num2 are integers that can be converted from string input to int using atoi.
The program assumes that the result of all operations can be stored in an int.
operator is one of either + (addition), - (subtraction), * (multiplication), / (division), or % (modulo).
If the number of arguments is incorrect, the program prints Error followed by a new line and exits with a status value of 98.
If the operator is none of the above, the program prints Error followed by a new line and exits with a status value of 99.
If the user tries to divide (/ or %) by 0, the program prints Error followed by a new line and exits with a status value of 100.
4. Most hackers are young because young people tend to be adaptable. As long as you remain adaptable, you can always be a good hacker
100-main_opcodes.c: C program that prints the opcodes of its own main function, followed by a new line.
Usage: ./main number_of_bytes
Opcodes are printed two-decimal long in hexadecimal, lowercase.
If the number of arguments is incorrect, the program prints Error followed by a new line and exits with a status value of 2.