<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>11.1</title>
</head>
<body><form action="">
Podaj wartość x:<input type="number" id="x"><br>
Podaj wartość y:<input type="number" id="y"><br>
<button onclick="oblicz(); return false;">Oblicz</button>
<p id="essa">...</p>
</form>
<script>
function oblicz(){
var x1 = document.getElementById("x").value;
var y1 = document.getElementById("y").value;
var gcbw = document.getElementById("essa");
var x2 = Number(x1);
var y2 = Number(y1);
var xs = Math.pow(x2*x2+y2*y2,1/2);
if(x1 == "" || y1 == ""){
alert("Jendo z pól jest puste");
}
else{
gcbw.innerHTML = "Długosc wektora wynosi: "+xs;
}
}
</script>
</body>
</html>
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