<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>operaciones basicas</title>
<link href="index.css" rel="stylesheet" type="text/css" />
</head>
<body>
<script src="index.js"></script>
calculadora <br>
<form action="resultado.php" method="post">
ingrese primer numero <br>
<input type="text" name="num1" />
<select name="ope">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<br> ingrese el segundo numero <br>
<input type="text" name="num2"/>
<input type="reset" value="Borrar"/>
<input type="submit" value="Calcular ya"/>
<?php
if ($_POST["num1"] != "" and
$_POST["num2"] != "" )
{$op=$_POST["ope"];
$n1=$_POST["num1"];
$n2=$_POST["num2"];
switch($op)
{ case"+": echo ($sum=$n1+$n2);break;
case"-": echo ($res=$n1+$n2);break;
case"*": echo ($mul=$n1+$n2);break;
case"/": echo ($divi=$n1+$n2);break;
}
}
else
{
echo ("debe ingresar un numero");
echo ('<br><a href="resultado"> volver</a>');
}
?>
</form>
</body>
</html>