0x11. C - printf

Description

This printf project is a collaboration between Samuel Adebayo and Gerald Juwah. Who are Software Engineers studing at students of ALX school. This project involves a function named "_printf" which would imitate the actual "printf" command located in the stdio.h library. This function contains some of the basic features and functions found in the man 3 of "printf".

What you would learn from this project:

• How to use git in a team setting
• Applying variadic functions to big projects
• The complexities of printf
• Managing a lot of flies and finding a good workflow

Prototype

int _printf(const char *format, ...);

Usage

• Prints a string to the standard output, according to a given format
• All files were created and compiled on Ubuntu 14.04.4 LTS using GCC 4.8.4 with the command gcc -Wall -Werror -Wextra pedantic *.c
• Returns the number of characters in the output string on success, -1 otherwise
• Call it this way: _printf("format string", arguments...) where format string can contain conversion specifiers and flags, along with regular characters.

The format contains the string that is printed. As _printf() is variadic function, it can receives n arguments that replace by n tags written inside the string.

The format tags prototype is the following:

%[flags][length]specifier

If the program runs successfully, the return value is the amount of chars printed.

Specifier	Output
c	Character
d or i	Decimal integer
s	String
b	Binary
%	Percentage charater
o	Signed Octal
u	Unsigned Integer
x	Unsigned Hexadecimal
X	Unsigned Hexadecimal (uppercase)
p	Pointer address
r	Reversr string of characters
R	ROT13 translaton of string
S	String with special chars replaced by their ASCII value

Examples

1. Printing the string of chars "Hello ALX School":

   • Input: \_printf("Hello %s.", "ALX School");
   • Output: Hello ALX School

2. Printing an integer number:

   • Input: \_printf("2 + 2 is equal to %d.", 4);
   • Output: 2 + 2 is equal to 4

3. Printing a binary:

   • Input: \_printf("98 in binary is [%b]", 98);
   • Output: 98 in binary is [1100010]

File Functions

_printf.c

the function that imitates printf(), by printing data.

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main.h

Header file where all Protypes are saved.

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man_3_printf

manpage file

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parse_char.c

Function that writes the Buffer Character.

/* Indetifier : %c */

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parse_int.c

Function that Prints an Integer.

/* Indetifier : %i or %d */

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parse_string.c

Function that Prints out a String.

/* Indetifier : %s */

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parse_binary.c

Function that Prints a Binary.

/* Indetifier : %b */

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parse_perc.c

Function that Prints a Percentage symbol.

/* Indetifier : %% */

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parse_oct.c

Function that Prints Decimal in Octal.

/* Indetifier : %o */

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parse_hex.c

Function that Prints Decimal in Hexadecimal.

/* Indetifier : %x */

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parse_x_X.c

Function that prints Decimal in Uppercase Hexadecimal.

/* Indetifier : %X */

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parse_unit.c

Function that Prints an Unsigned Integer.

/* Indetifier : %u */

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parse_buff.c

Function that Prints the Buffer

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CONTRIBUTION.md

Documentation stating the styleguide on how the work flow was carried out.

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.gitignore

Files to be ignored when pushing to github.

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project_junkyard

Function files used to run various tests on the _printf Function.

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Authors

• Samuel Adebayo adebayo.samuel.olusegun@gmail.com
• Gerald Juwah geraldjuwah@gmail.com