ft_printf

📌 Description

ft_printf is a custom implementation of the standard C printf function, developed as part of the 42 Yerevan curriculum. It replicates core formatting behavior and returns the number of printed characters.

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⚙️ Features

Supported format specifiers:

Specifier	Description
%c	Character
%s	String
%p	Pointer address
%d, %i	Signed integer
%u	Unsigned integer
%x	Hexadecimal (lowercase)
%X	Hexadecimal (uppercase)
%%	Percent sign

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🛠️ Technologies

• C
• Linux
• Makefile

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🚀 Compilation

make

This will generate the libftprintf.a static library.

To clean files:

make clean
make fclean
make re

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🚀 Usage

#include "ft_printf.h"

int main(void)
{
    int ret;

    ret = ft_printf("Hello, %s! Score: %d%%\n", "Alice", 95);
    ft_printf("Printed characters: %d\n", ret);

    return 0;
}

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📌 Example Output

Hello, Alice! Score: 95%
Printed characters: 33

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🧠 Implementation Details

• Uses low-level write() for output
• Handles NULL strings ((null))
• Handles NULL pointers ((nil))
• Supports variadic arguments (va_list)
• Recursive handling of numbers and hex values

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📂 Project Structure

• Parsing – format string processing
• Printing – character, string, number output
• Utilities – helper functions for conversion

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🎯 Purpose

This project strengthens understanding of variadic functions, formatting logic, and low-level output handling in C.

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👤 Author

Aghvan Aleksanyan 42 Yerevan Student