# _Printf function

Welcome, this is our holberton school project, the one that consisted of creating a small copy of the printf function with language C.

In simple words, the printf function prints a message on the screen using a "format string" that allows us to mix multiple strings in the final string to be displayed on the screen, but in case you want to see more in depth how it works I leave you these resources so you can investigate.

Compilation

$ gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c

Format of printf function

int _printf(const char *format, ...)

this is to see well what to pass to our function as parameters: on one side the first parameter we send a string, where it receives any type (characters, integers, %s, etc) and on the other (...) we indicate the argument.

Usage examples and return

input

    _printf("Hello");

output

    Hello

input

    int main(){
        int a = 120;
     _printf("I have %d dollars", a);
    }

output

I have 120 dollars

Resources of the original function

- Library that allows to use the function

STDIO.H](https://www.tutorialspoint.com/c_standard_library/stdio_h.htm)**

- man printf(3) explains in detail the operation and use of the function

man printf(3) (https://man7.org/linux/man-pages/man3/printf.3.html)

Format string or Conversor's

Specifiers	Output	Example
%c	Character	h
%s	String	Hello !!
%d & %i	Signed Decimal Integer	200
%	Print a % when we find %% inside the printf function	%
%r	rot13 hello	uryyb

Libraries used

    #include <stddef.h>
    #include <stdarg.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>

Structure used

 typedef struct type_t
 {
 char tipo;
 int (*f)(va_list a);
 } type_t_f;

Functions that we used

    int _putchar(char c);
    int print_char(va_list s);
    int print_string(va_list s);
    int print_number(va_list s);
    int print_number_ui(va_list i);
    int print_number1(int i);
    rec_bin(unsigned int n);
    void rec_bin(unsigned int n);
    int print_binary(va_list a);
    int print_octal(va_list c);
    int print_rot(va_list ch);
    int print_rev(va_list ch);

Flowchart

authors & github accounts

Valentin repetto | Santiago Neira