Example of main argc and argv - 42 Berlin practice

main.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   main.c                                             :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ccattano <ccattano@student.42Berlin.de>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/22 09:36:07 by ccattano          #+#    #+#             */
/*   Updated: 2022/10/22 09:36:09 by ccattano         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
#include <unistd.h>
#include <stdio.h>
/*	
	Exercise for the talk on 1st floor on Saturday 22 oct 14:00 pm
	Few examples commented out to go one by one.
		ex1 - shows argument count and value
		ex2 - iterates over every letter on them
		ex3 - print the first letter of each argument
	Uncomment each exercise to try them and comment the other
*/

void	ft_putchar(char c)
{
	write(1, &c, 1);
}

int	main(int argc, char *argv[])
{
	int	i;
	char numberOfArguments;

	i = 0;
	/*		CONVERT AC a.k.a agc to a char number to display	*/
	numberOfArguments = (argc + 48);

	/*		NUMBER OF ARGUMENTS DISPLAY HELPER					*/
	write(1,"----------------------------\n", 29);
	write(1, "Number of arguments:\t\targc ---> ", 32);
	write(1, &numberOfArguments, sizeof(numberOfArguments));
	ft_putchar('\n');
	write(1,"----------------------------\n", 29);


	/* ONLY if we give one argument or more */
	if (argc == 3 || argc == 2) 
	{	
		/* -------------------------------------------------
			ex1, ARGUMENT COUNT AND VALUE
				examples:
					./program one two
					./program "Hallo mama, Im ok I just look tired" "Piscine effects on epidermis by julian et al" 
		   -------------------------------------------------*/


		/* printf("Program Name (First argument arg[0]):\t");
		printf("%s \n",argv[0]);
		
		printf("Argument 1:\t\t\t\t");
		printf("%s \n",argv[1]);
		
		printf("Argument 2:\t\t\t\t");
		printf("%s \n",argv[2]); */


		/* ----------- END OF EX1 ----------- */


		/* -------------------------------------------------
		 	EX2 - CHAR BY CHAR, step by step

				examples:
				./program pizza pasta
				./program 12 12
				./program "hello world!" "Save the planet"
		   -------------------------------------------------*/


		/* write(1,"Argument n2 \targv[1]:\t---> ",27);

		while(argv[1][i] != '\0')
		{
			write(1, &argv[1][i],1);
			i++;
		}
		ft_putchar('\n');

		i = 0;
		
		write(1,"Argument n3 \targv[2]:\t---> ",27);

		while(argv[2][i] != '\0')
		{
			write(1, &argv[2][i],1);
			i++;
		}
		ft_putchar('\n'); */


		/* ----------- END OF EX2 -------------- */


		/* -------------------------------------------------
			EX3, First letter of each
				examples:
					./program one two
					./program "Hallo mama, Im ok I just look tired" "Piscine effects on epidermis by julian et al" 
		   -----------------------------------------------*/


		/* printf("first letter of each\n------------\n");
		printf("First letter in arg[1]:\t\t\t %c \n",argv[1][0]);
		printf("First letter in arg[2]:\t\t\t %c \n",argv[2][0]); */


		/* ----------- END OF EX3 --------------------------------*/
		
	}
	/* If more or less args given, treat your user how they deserve */
	else if(argc < 2)
		printf("---------\nTo Argue about arguments , you do need arguments ;-)\n");
	else if(argc > 3)
	{
		printf("Let's keep it simple, shall we ?\ninput a maximum of 2 arguments\n");
		printf("Remember that the program name its always index 0 and count 1");
	}
}