<?php
include( "xmlvalido.php" );
$_COOKIE [ "ACUMULADO" ])&&(!isset( $_POST [ "CE" ]))){
$valor = $_COOKIE [ "ACUMULADO" ];
$_POST [ "op" ]== "1" ){
$valor_nuevo = $valor + $_POST [ "dat" ];
$_POST [ "op" ]== "2" ){
$valor_nuevo = $valor - $_POST [ "dat" ];
$_POST [ "op" ]== "3" ){
$valor_nuevo = $valor * $_POST [ "dat" ];
$_POST [ "op" ]== "4" ){
$valor_nuevo = $valor / $_POST [ "dat" ];
setcookie ( "ACUMULADO" , $valor_nuevo );
abre_web ( "Mi calculadora" );
setcookie ( "ACUMULADO" , 0 );
$valor_nuevo = 0 ;
$valor = 0 ;
abre_web ( "Mi calculadora" );
?>
<br>
<?php echo $valor_nuevo ; ?> </p>
<?php
echo cierra_web ();
?>
<?php
function abre_web ( $titulo )
$salida =<<<TXT
< ?xml version="1.0" encoding="UTF-8"? >
$titulo </title>
TXT;
$salida ;
cierra_web (){
$salida =<<<TXT
</p>
TXT;
$salida ;
enlace ( $texto , $url ){
$salida =<<<TXT
<a href=" $url "> $texto </a>
TXT;
$salida ;
?>
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