📣 Introduction

This project is pretty straightforward. It asks students to recode printf() in order to make them learn about how a variadic function works. It also aims to make students think about how they are going to implement the project. After all, the key to a successful ft_printf is a well-structured and extensible code.

Inside the folder ft-printf-studies there is a file that test all the possible combinations of printf flags.

✨ Implemented features

Mandatory

• ✅ The function has to implement the following conversions: cspdiuxX%

Conversion	Description
c	Prints a single character.
s	Prints a string (as defined by the common C convention).
p	The void * pointer argument has to be printed in hexadecimal format.
d	Prints a decimal (base 10) number.
i	Prints an integer in base 10.
u	Prints an unsigned decimal (base 10) number.
x	Prints a number in hexadecimal (base 16) lowercase format.
X	Prints a number in hexadecimal (base 16) uppercase format.
%	Prints a percent sign.

Bonus 1

• ❌ Manage any combination of the following flags: -0. and the field minimum width under all conversions.

Flag	Description
-	Left aligns the argument passed.
0	Add '0' as a padding character in numeric conversions (single space is default).
.	Precision definition, followed by a number.

Bonus 2

• ✅ Manage all the following flags: # + (Yes, one of them is a space).

Flag	Description
' '	Adds a single space (' ') in the front of positive numeric conversions.
#	Adds the corresponding prefix in front of x and X conversions.
+	Adds a plus sign (+) in the front of positive numeric conversions.

⚒️ How to use the project

Run make or make bonus if you want to compile the mandatory project or the bonus project respectively.

After that, to use the ft_printf() in your project it's necessary to include the library libftprintf.a and the header as follows:

#include "ft_printf.h" 

If you want to include the bonus version, use:

#include "ft_printf_bonus.h" 

Don't forget to add the following flags when compiling your project:

gcc ... -lftprintf -L path/to/libftprintf.a -I path/to/libftprintf.h

📖 References

• Criando Funções Com Número Variável De Argumentos Em C by Daemonio Labs.

• Formatted output in 12. Input/Output on Streams by The GNU C Library Reference Manual.

• COLTON, Don. Secrets of “printf”. Brigham Young University Hawaii, 2014.

• C++ Documentation of printf() by cplusplus.com.

• To test the project features, I used the ft_printf_tester made by Paulo Santana.