// U L OZ T E J A K O index.php
<html>
<title>Kvadraticka rovnice</title>
<body><center>
<!-- tady je formular, ktery po kliknuti nam odesle promenne do kvadvys.php -->
<form action="kvadvys.php" method="post">
<textarea type=text name=p1 cols="4" rows=1></textarea>x na druhou
<textarea type=text name=p2 cols="4" rows=1></textarea>x
<textarea type=text name=p3 cols="4" rows=1></textarea>=0<br>
<input type="submit" name=ok value=ok>
</form><br><br>
Rovnice:<br><pre> <! zobrazeni vzorce pro mene chapave-->
-b +(-) sqrt(sqr(b)- 4ac)
-------------------------------------
2a
</pre><br><br>
*sqr = na druhou<br>
*sqrt = druha odmocnina
<br><br><br><hr>
<center> Made by <a href="mailto:unlucky.child@gmail.com">unlucky.child@gmail.com</a>. Please dont change it for your own.</center>
</center>
</body>
</html>
// U L O Z T E J A K O kvadvys.php
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1250">
<title>PHP - anketa</title>
</head>
<?
if ($p1==""): //pokud neni zadane cislo, pak cislo je 1
$p1=1;
elseif ($p2==""):
$p2=1;
endif;
if ($p1 ==$p1 and $p2 ==$p2 and $p3 ==$p3): //pokud jsou zadana vsechna 3 cisla
$dis =(($p2 * $p2) -4 * $p1 * $p3 ); //vypocitavani diskriminantu
if ($dis <=0): //pokud je diskriminant mensi nez nula
echo"diskriminant je mensi nez 0. Priklad nema reseni!!!!!<br>";
endif;
$odmocnina= sqrt($dis); //vypocitavani odmocniny
$vys1=((-$p2+ $odmocnina)/(2*$p1)); //prvni vysledek (X1)
$vys2= ((-$p2- $odmocnina)/(2*$p1)); //druhy vysledek (X2)
echo "diskriminant je: $odmocnina <br>"; //Zobrazeni na strance
echo "vysledek x1 je: $vys1<br>";
echo "vysledek x2 je: $vys2<br>";
echo "<center>x1 = - ($p2) + sqrt (sqr($p2) - 4* $p1* $p3)<br>";
echo " -----------------------------------------------<br>";
echo " 2 * $p1<br><br>";
echo "x1 = - ($p2) - sqrt((sqr($p2) - 4* $p1 * $p3)<br>";
echo " -----------------------------------------------<br>";
echo " 2 * $p1</center>";
endif;
?>
<br><br>
*sqr = na druhou<br>
*sqrt = druha odmocnina
<br><br><br>
<center> Made by <a href="mailto:unlucky.child@gmail.com">unlucky.child@gmail.com</a>. Please dont change it for your own.</center>
</center>
</body>
</html>