<!DOCTYPE html>
<html lang="cs-cz">

    <head>
        <meta chartset="utf-8" />
        <meta name="vievport" content="width=device-width, initial-scale=1.0" />
        <title>PHP Kalkulačka 25.7.2024 David Tomek I3 unixuser@seznam.cz</title>
<style>
   
    table{
        border:2px solid green;
        width:30%;
        padding:10px;
        background-color:lightgray;
    }
    input{
        background-color:lightblue;
        margin-bottom:10px;
        width:"auto";
    }
    footer{
        background-color:lightgray;
        border:2px solid green;
        padding:10px;
        margin-top:10px;
        width:30%;
        font-size:8px;
    }
    
    label{
        background-color:#9dadc7;
        border:2px solid #718f76;
    }
    
    body{
        background-color:#9eb5b8;
    }
</style>
</head>

<body>

<?php
  $cislo1=$cislo2=0;
  $vysledek=0;
 // echo $vysledek;
if(isset($_POST["secti"])){
    $cislo1=(float)$_POST['cislo1I'];
    $cislo2=(float)$_POST['cislo2I'];
    $vysledek=$cislo1+$cislo2;
}

if(isset($_POST["odecti"])){
    $cislo1=(float)$_POST['cislo1I'];
    $cislo2=(float)$_POST['cislo2I'];
    $vysledek=$cislo1-$cislo2;
}

if(isset($_POST["vynasob"])){
    $cislo1=(float)$_POST['cislo1I'];
    $cislo2=(float)$_POST['cislo2I'];
    $vysledek=$cislo1*$cislo2;
}

if(isset($_POST["vydel"])){
    $cislo1=(float)$_POST['cislo1I'];
    $cislo2=(float)$_POST['cislo2I'];
    if($cislo2!=0) $vysledek=$cislo1/$cislo2; else $vysledek="Chyba dělení nulou !";
}

?>

<form method="post" action="">
            
            <table>
            <tr>
                <td><label>První číslo</label></td>
                <td><input type="text" name="cislo1I"  value="<?php echo $cislo1;?>"/></td>
            </tr>
            
            <tr>
                <td><label>Druhé číslo</label></td>
                <td><input type="text" name="cislo2I" value="<?php echo $cislo2;?>" /></td>
            </tr>
            
            <tr>
                <td><label>Výsledek</label></td>
                <td><input type="text" name="vysledekI" value="<?php echo $vysledek;?>" /></td>
            </tr>
            
            <tr>
                <td><label>Matematická operace</label></td>
            </tr>
            
            <tr>
                <td><label>Sečti</label></td>
                <td><input type="submit" name="secti" value="+" /></td>
            </tr>    
            
            <tr>
                <td><label>Odečti</label></td>
                <td><input type="submit" name="odecti" value="-" /></td>
            </tr>
            
            <tr>
                <td><label>Vynásob</label></td>
                <td><input type="submit" name="vynasob" value="*" /></td>
            </tr>
                
            <tr>
                <td><label>Vyděl</label></td>
                <td><input type="submit" name="vydel" value="/" /></td>
            </tr>
            
            <tr>
                <td>PHP Kalkulačka 25.7.2024 David Tomek I3</td>
            </tr>

            <tr>
                <td><a href=mailto:"unixuser@seznam.cz">unixuser@seznam.cz</a></td>
            </tr> 
         
            <tr>
            <td><a href="https://home.spsostrov.cz/~tomeda/">https://home.spsostrov.cz/~tomeda/</td>
            </tr>
            
            </table>
</form>



</table>

</body>
</html>