/***************************************************************************
 *   Copyright (C) 2007 by Fernando Briano   				   				*
 *   transformers.es@gmail.com - http://picandocodigo.linuxuruguay.org     			*
 *                                                                         								*
 *   This program is free software; you can redistribute it and/or modify 		 	*
 *   it under the terms of the GNU General Public License as published by  			*
 *   the Free Software Foundation; either version 2 of the License, or     			*
 *   (at your option) any later version.                                   						*
 *                                                                         								*
 *   This program is distributed in the hope that it will be useful,       				*
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        		*
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         	*
 *   GNU General Public License for more details.                          					*
 *                                                                         								*
 *   You should have received a copy of the GNU General Public License     			*
 *   along with this program; if not, write to the                        		 			*
 *   Free Software Foundation, Inc.,                                       						*
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             			*
 ***************************************************************************/

//Declaracion de variables
var numero1 = 0;
var numero2 = 0;
var operacion;

//cuando se apreta un numero, esta funcion lo recibe.
function asignarNumero(numero){
    if(numero1==0 && numero1 !== '0.'){
        numero1 = numero;
    }else{
        numero1 += numero;
    }
    refreshDisplay();
}

function asignarComa(){
	if(numero1 == 0) {
		numero1 = '0.';
	} else if(numero1.indexOf('.') == -1) {
		numero1 += '.';
	}
	refreshDisplay();
}

//Funcion tecla C.
function teclaC(){
	numero1 = 0;
	numero2 = 0;
	refreshDisplay();
}


//Esta funcion se llama cada vez que se presiona un boton de operacion.
function operar(valor){
	if (numero1 == 0){
		numero1 = parseFloat(document.getElementById("txtNumero").value);
	}
	numero2 = parseFloat(numero1);
	numero1= 0;
	operacion = valor;
}

/****************Funcion para boton igual*******************
*         suma = 1, resta = 2, multiplicacion = 3,         *
*         division = 4, exponente = 5                      *
************************************************************/
function esIgual(){
    numero1 = parseFloat(numero1);
	switch (operacion){
		case 1:
			numero1 += numero2;
		break;
		case 2:
			numero1 = numero2 - numero1;
		break;
		case 3:
			numero1 *= numero2;
		break;
		case 4:
			numero1 = numero2 / numero1;
		break;
		case 5:
			numero1 = Math.pow(numero2, numero1);
		break;
	}
	refreshDisplay();
	numero2 = parseFloat(numero1);
	numero1 = 0;
}

function refreshDisplay(){
	document.getElementById("txtNumero").value = numero1;
}