ft_printf is a project at 42 that aims to mimic the behavior of the original printf function. The project is written in C and is a part of the curriculum at 42. it's a great project to learn about variadic functions and how to parse and format strings.

The project contains 2 parts: Mandatory and Bonus. you need also create a Makefile to compile the project.

• Mandatory part is about implementing wihtout buufering the basic functionality of the printf function like conversion specifiers: cspdiuxX% and return the number of printed characters.
• Bonus part is about implementing the following conversion flags and manage with them all: #0-+. yes the last character is a space.

to compile the project you need to clone the repository first, to do that run the following command:

git clone https://github.com/whoismtrx/42_ft_printf.git ft_printf
cd ft_printf
make

to use the ft_printf function you need to include the header file in your project:

// example.c
#include "ft_printf.h"

cc example.c libftprintf.a -o example

ft_printf function supports the following conversion specifiers, width and flags:

• specifiers:

  • % : print a % character.
  • c : print a character.
  • s : print a string.
  • p : print a pointer address.
  • d : print a decimal number.
  • i : print an integer.
  • u : print an unsigned integer.
  • x : print a hexadecimal number in lowercase.
  • X : print a hexadecimal number in uppercase.

• width:

  • number : set the width to the number.

• flags:

  • # : print the number in an alternative format.
  • 0 : print the number with leading zeros.
  • - : left-justify the number.
  • + : print the number with a sign.
  • . : print the number with a precision.
  • space : print the number with a space if no sign is printed.

you can find some resources about the project in the following links:

• variadic functions: this is a great video about variadic functions and how to use them in C.
• printf: this is a great article about printf, also you can read this pdf Secrets of printf to understand how printf works.