55555555


<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
#calculadora{float:left; width:284px; height:302.5px;border:1px solid black;}
#linha{float:left; width:284px; border-bottom:1px solid black;height:57.5px;}
#total{float:left; width:284px;border-bottom:1px solid black;height:70px;}
ul{float:left; list-style: none;padding:0px; margin:0px;}
li{float:left;width:56px;height:37.5px;border-right:1px solid black;text-align:center;padding-top:20px;}
li:hover{background:black; color:white;cursor:pointer;}
#enter{float:right;width:56px;height:104px;}
</style>


</head>
<?php


session_start();

if($_SERVER['REQUEST_METHOD'] == 'POST'){
    if (!isset($_SESSION['op1'])){
        $_SESSION['op1'] = $_POST['op'];

    }else{
        if(!isset($_SESSION['op2'])){
            if(isset($_POST["op"])){
                $_SESSION["op2"]=$_POST["op"];
            }else{
                echo 'Selecione o segundo número primeiro.';
            }
        }else{
            if(!isset($_POST["operador"])){
                echo 'Selecione um operador';
            }else{
                switch ($_POST["operador"]){
                    case '+':
                        $conta=$_SESSION['op1'].'+'.$_SESSION["op2"].'=';
                        $total=$_SESSION["op1"]+$_SESSION["op2"];
                        session_unset();
                        break;
                    case '-':
                        $conta=$_SESSION['op1'].'-'.$_SESSION["op2"].'=';
                        $total=$_SESSION["op1"]-$_SESSION["op2"];
                        session_unset();
                        break;
                    case '/':
                        $conta=$_SESSION['op1'].'/'.$_SESSION["op2"].'=';
                        $total=$_SESSION["op1"]/$_SESSION["op2"];
                        session_unset();
                        break;
                     case '*':
                        $conta=$_SESSION['op1'].'*'.$_SESSION["op2"].'=';
                        $total=$_SESSION["op1"]*$_SESSION["op2"];
                        session_unset();
                        break;
                }
            }
        }
    }

}
?>
<body>
<div id="calculadora">
    <div id="total">
        <?php if(isset($conta)){echo $conta;}if(isset($total)){ echo $total;} ?>

    </div>

    <div id="linha">
         <ul>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="7"><input type="submit" value="7"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="8"><input type="submit" value="8"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="9"><input type="submit" value="9"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="operador" value="/"><input type="submit" value="/"></form></li>
            <li></li>
        </ul>
    </div>
    <div id="linha">
         <ul>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="4"><input type="submit" value="4"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="5"><input type="submit" value="5"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="6"><input type="submit" value="6"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="operador" value="*"><input type="submit" value="*"></form></li>
            <li>1/x</li>
        </ul>
    </div>
    <div id="linha" style="width:228px;">
        <ul>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="1"><input type="submit" value="1"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="2"><input type="submit" value="2"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="3"><input type="submit" value="3"></form></li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="operador" value="-"><input type="submit" value="-"></form></li>
        </ul>
    </div>
    <div id="enter">
        <ul>
            <li style="border:none;width:56px;height:69px;padding-top:45px;">=</li>
        </ul>
    </div>
    <div id="linha" style="width:228px;border:none;">
        <ul>
            <li style="width:113px;"><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="op" value="0"><input type="submit" value="0"></form></li>
            <li>,</li>
            <li><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"><input type="hidden" name="operador" value="+"><input type="submit" value="+"></form></li>
        </ul>
    </div>
    </form>

</div>
</body>
</html>