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In the ft_printf project, I replicated the functionality of the standard printf function in C.

The main challenge of this project was to learn how variadic functions work and how to use them, which involved handling the formatting and printing of text with different data types. Completing this project made possible adding it to my libft library for future use.

  • Reminder: ❗️ You can check all my 42 projects at 42 Cursus
Code Explanation
ft_printf Is the main function that formats and prints the given string with variadic arguments.
select_format A helper function used to select the format of an argument based on the provided value and then call the corresponding formatting function.
Formatting
Functions
Functions like ft_pf_putchar, ft_pf_putstr, ft_pf_pointer, and ft_pf_putnbr_base are used to format
and print different data types to handle various the different format specifiers

Supported Format Specifiers

Format Description Formatting Function Format putnbr Base
%c Prints a character ft_pf_putchar int -
%s Prints a string ft_pf_putstr char * -
%p Prints a pointer ft_pf_pointer
ft_pf_putnbr_base
unsigned long long hexadecimal
%d and %i Prints signed integers ft_pf_putnbr_base int decimal
%u Prints unsigned integers ft_pf_putnbr_base unsigned int decimal
%x Prints integers in lowercase hexadecimal ft_pf_putnbr_base unsigned int hexadecimal
%X Prints integers in uppercase hexadecimal ft_pf_putnbr_base unsigned int hexadecimal
%% Prints a percentage simbol %

Usage example

Main example:

int  main(void)
{
    ft_printf("The answer to %s is %d.\n", "life", 42);
    ft_printf("UpTo%c", 'U');
    return (0);
}

Output:

The answer to life is 42
UpToU

Limitations

This implementation does not include all the features and options provided by the standard printf function. It does not handle width, precision, or other formatting flags.

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Recreation of the printf function

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