franek12

<html>
<head>

  <title> create element p </title>
</head>
<body>
<h1> oblicz koszt paliwa</h1>
podaj paliwo 1-2 benzyna, olej: <input type="number" id="paliwo"><br>

ile litrów: <input type="number" id="ilosc"><br>

<input type="button" value="oblicz" id="b1">

<script>
b1.addEventListener('click', e=>{
let akapit=document.createElement('p');
let x,y,koszt;

x=parseFloat(paliwo.value);
y=parseFloat(ilosc.value);

switch(x)
{
 case 1: koszt=y*4; break;
 case 2: koszt=y*3.5; break;
 default: koszt=0;
}

document.body.appendChild(akapit);
akapit.innerHTML="koszt paliwa=  "+koszt;
});
</script>
</body>
</html>