Untitled

<!DOCTYPE html>

<html lang="et">

	<head>

		<meta charset="UTF-8">

		<title>Ruutvõrrandi lahendamise programm</title>

		<style>

			body{

				margin-left: 10px;

			}

			.nr{

				width: 25px;

				border: 1px solid #000000;

			}

		</style>

	</head>

	<body>

		<h2>Ruutvõrrandi lahendamise programm</h2>

		<br><br>

		<a>

			<table>

				<tr>

					<td rowspan="2"><font size="+6">{<!-- } --></font></td>

					<td>a<sub>1</sub><i>x</i> + b<sub>1</sub><i>y</i> + c<sub>1</sub> = 0</td>

				</tr>

				<tr>

					<td>a<sub>2</sub><i>x</i> + b<sub>2</sub><i>y</i> + c<sub>2</sub> = 0</td>

					</tr>

			</table>
		</a>

		<br><br>

		<a>Sisesta lineaarvõrrandite kordajad a, b ja c! </a>

		<br><br>

		<form method="get" action="<?php echo $_SERVER["PHP_SELF"];?>">

			<table>

						<tr>

							<td rowspan="2"><font size="+6">{<!-- } --></font></td>

							<td><input class="nr" type="number" name="a1"><i> x</i> + <input class="nr" type="number" name="b1"><i>y</i> + <input class="nr" type="number" name="c1"> = 0</td>

						</tr>

						<tr>

							<td><input class="nr" type="number" name="a2"><i> x</i> + <input class="nr" type="number" name="b2"><i>y</i> + <input class="nr" type="number" name="c2"> = 0</td>

						</tr>

				</table>

			<br><br>

			<input type="submit" value="Arvuta!">

			<br><br>

		</form>

<?php

	if ( isset($_GET["a1"], $_GET["b1"], $_GET["c1"], $_GET["a2"], $_GET["b2"], $_GET["c2"])){

		$a1 = $_GET["a1"];

		$b1 = $_GET["b1"];

		$c1= $_GET["c1"];

		$a2 = $_GET["a2"];

		$b2 = $_GET["b2"];

		$c2 = $_GET["c2"];

		if(is_numeric($a1) && is_numeric($b1) && is_numeric($c1)&& is_numeric($a2)&& is_numeric($b2)&& is_numeric($c2) ){

				$D = $a1 * $b2 - $a2 * $b1;

				$Dx = -$c1 * $b2 - (-$c2 * $b1);

				$Dy = $a1 * (-$c2) - $a2 * (-$c1);

				if ( $D==0 ){

					echo "Lahendit ei saa arvutada, sest sirged on paralleelsed";

				}elseif ($Dx==0 ){

					echo "Sirged ühtivad ning lineaarvõrrandisüsteemil on lõpmata palju lahendeid.";


				}else{

				$x = $Dx / $D;

				$y = $Dy / $D;

				echo"

				<table>

							<tr>

								<td rowspan='2'><font size='+6'>{<!-- } --></font></td>

								<td><i>x</i> = $x</td>

							</tr>

							<tr>

								<td><i>y</i> = $y</td>

							</tr>

				</table>";


				}

		}else{

			echo"Sisestatud kordaja(d) ei ole reaalarv(ud)!";

		}


	}

?>

	</body>

</html>