| _printf |
|---|
| _printf is the function for c language to make formatted prints. This document explains how printf works and how to design the right format specification for any occasion |
At the moment of entering the arguments in the function it goes to the lexical analysis LEXER : which is in charge of giving sense to the string and differentiating the percentages, from there it goes to the parse PARSE: it looks for the formats and differentiates them from the rest of the string and gives them sense, so it will tell to which group it belongs according to its format, for example if its format is string and it applies the format, then it goes to the evaluator EVALUATOR: This brings the function that handles the format, i.e. calls the handlers, i.e. brings the function that sets the format and now passes to the printf PRINTF : prints the burfer that was previously selected and finally clears the memory with FREE: clears the memory.
#include "holberton.h"
/**
* Filename: main.c
* main - Entry point
*
* Return: Always 0
*/
int main(void)
{
/* Print strings */
_printf("Hello %s\n", "World");
/* Print integers */
_printf("%d\n", 1024);
/* Print a single char */
_printf("%c\n", 'H');
return (0);
}
This function receives a formatted string and concatenates and formats each of the attributes passed to the function to print each of these parse types for any specific result in any context.
LIBRARY: #include "Holberton.h" int _printf(const char *format, ...);
| Requirements |
|---|
| General |
| Allowed editors: vi, vim, emacs |
| All your files will be compiled on Ubuntu 14.04 LTS |
Your programs and functions will be compiled with gcc 4.8.4 using the flags gcc -Wall -Werror -Wextra -pedantic -Wno-format --std=c90 *.c |
| All your files should end with a new line |
| A README.md file, at the root of the folder of the project is mandatory |
| Your code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl |
| You are not allowed to use global variables |
| No more than 5 functions per file |
| In the following examples, the main.c files are shown as examples. You can use them to test your functions, but you dont have to push them to your repo (if you do we wont take them into account). We will use our own main.c files at compilation. Our main.c files might be different from the one shown in the examples |
| The prototypes of all your functions should be included in your header file called holberton.h |
| Dont forget to push your header file |
| All your header files should be include guarded |
| Note that we will not provide the _putchar function for this project |
| Compilation |
|---|
| Your code will be compiled this way: |
| First Tab: |
| $ gcc -Wall -Werror -Wextra -pedantic *.c |
| As a consequence, be careful not to push any c file containing a main function in the root directory of |
| Our main files will include your main header file (holberton.h): #include holberton.h |
| You might want to look at the gcc flag -Wno-format when testing with your _printf and the standard printf |
| This function prints strings with a specified format. |
| Formats |
|---|
| %c print a single character |
| %d print a decimal (base 10) number |
| %e print an exponential floating-point number |
| %f print a floating-point number |
| %g print a general-format floating-point number |
| %i print an integer in base 10 |
| %o print a number in octal (base 8) |
| %s print a string of characters |
| %u print an unsigned decimal (base 10) number |
| %x print a number in hexidecimal (base 16) |
| %% print a percent sign (% also works) |
- Samuel Trujillo