/*	Reads a string from stdin and converts it to uppercase or lowercase 
 * 	depending on an option readed from stdin	*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#define MSG_STR_PROMPT	"Introduzca una cadena:"
#define MSG_FMT_PROMPT	"Convertir a: (0 - MAYUSCULAS / 1 - MINUSCULAS)"
#define MSG_FMT_ERR		"Err: Formato incorrecto"

#define MAX_STR_LEN 100

typedef enum {
	FMT_MAYUSCULAS, FMT_MINUSCULAS
} format_t;


int
main (void)
{
	char buffer[MAX_STR_LEN];
	char str[MAX_STR_LEN];
	format_t format;

	printf("%s%s", MSG_STR_PROMPT, "\n>> ");
	fgets(buffer, MAX_STR_LEN, stdin);
	strcpy(str, buffer);

	printf("%s%s", MSG_FMT_PROMPT, "\n>> ");
	format = (getchar () - '0');
	if((format < 0) || (format > 1)) {
		fprintf(stderr, "%s\n", MSG_FMT_ERR);
		return 1;
	}

	int i, aux;
	switch(format)
	{
		case FMT_MAYUSCULAS: 
			for(i = 0; (aux = str[i]) != '\n'; i++)
				if(islower(aux))
					str[i] = toupper(aux);

			break;
		case FMT_MINUSCULAS:
			for(i = 0; (aux = str[i]) != '\n'; i++)
				if(isupper(aux))
					str[i] = tolower(aux);

			break;
	}

	printf("%s", str);
	return 0;
}