ft_printf

📖 About

This project is part of the 42 curriculum.
The goal is to recreate the C standard library function printf with a limited set of features, while learning about variadic functions and formatted output.

ft_printf writes formatted output to the standard output, similar to the real printf.

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✨ Features

• Handles the following conversions:
  • %c : character
  • %s : string
  • %p : pointer (in hexadecimal)
  • %d / %i : signed decimal integer
  • %u : unsigned decimal integer
  • %x / %X : hexadecimal integer (lowercase / uppercase)
  • %% : literal %
• Supports variable argument lists (<stdarg.h>).
• Returns the number of characters printed.

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🛠️ Usage

1. Clone the repository

git clone --recurse-submodules git@github.com:grignetta/42_ft_printf.git printf

2. Build the library

Run make to compile both libft and ft_printf. This will create a static library called libftprintf.a

3. Write your own program

Create a simple file (e.g. main.c) that uses ft_printf:

#include "ft_printf.h"

int main(void)
{
    ft_printf("Hello %s!\n", "world");
    ft_printf("Number: %d, Hex: %x, Pointer: %p\n", 42, 42, (void*)42);
    return (0);
}

4. Compile your program with ft_printf

cc main.c libftprintf.a -o my_program