Project _printf

This project is a custom implementation of the printf function in the C language. It allows displaying formatted strings on the standard output.

Table of Contents

• Introduction
• Project and printf Function Description
• Compilation Command
• Prerequisites
• Usage Examples
• Testing
• Flowchart

Introduction

This project aims to recreate the printf function from the C standard library. It supports multiple format specifiers and allows displaying formatted strings.

Project and printf Function Description

The goal of this project is to create a custom version of the printf function in the C language. The printf function allows displaying formatted strings on the standard output. It takes a format string and a variable number of arguments, and outputs the formatted string according to the format specifiers present in the format string.

Format Specifiers

The following table describes each format specifier supported by our custom printf function:

Specifier	Description	Example
%c	Character	_printf("Character: %c", 'A');
%s	String	_printf("String: %s", "Hello");
%d	Decimal integer	_printf("Integer: %d", 123);
%i	Integer (same as %d)	_printf("Integer: %i", 123);
%%	Literal % character	_printf("Percent: %%");

Compilation Command

To compile the program, use the following command:

gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c

The output file generated will be named "a.out"

Prerequisites

• Ubuntu 20.04 or a more recent version
• GCC (GNU Compiler Collection) Version used : gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04) see (https://gcc.gnu.org/onlinedocs) for manual
• Git
• Betty doc & style guide set of guidelines for writing clean, readable, and maintainable code: see (https://github.com/alx-tools/Betty/blob/master/README.md) for more informations

Usage Examples

Here are some examples of using the _printf function:

#include "main.h"
/**
* main - Entry point of the program
*
* This function demonstrates the usage of the custom _printf function by
* printing various types of formatted strings including integers, characters,
* strings, and a percentage sign.
*
* Return: Always return 0 (Success)
*/
int main(void)
{
    int len;
    int number = 2;
    char character = 'C';
    char *string = "peripatetic";

    // Display a sentence with a number
    len = _printf("There are %d peripatetics in my garden.\n", number);

    // Display a sentence with a character
    len = _printf("The first letter of my name is %c.\n", character);

    // Display a sentence with a string
    len = _printf("I saw a %s in the forest.\n", string);

    // Display a sentence with a percentage symbol
    len = _printf("The percent symbol is %%.\n");

    return (0);
}

Testing

To test the code, we used Valgrind to check for memory leaks and segmentation faults. Here is the command used to test with Valgrind:

valgrind ./a.out

We also performed manual tests to ensure the output of the _printf function matched expectations.

Flowchart