text: var x = 3.14;
  var y = 3;
  document.getElementById("demo").innerHTML = x + "<br>" + y;
  
  var x = 123e5;
  var y = 123e-5;
  document.getElementById("demo1").innerHTML = x + "<br>" + y;
  
  var x = 999999999999999;
  var y = 9999999999999999;
  document.getElementById("demo2").innerHTML = x + "<br>" + y;
  
  var x = 0.2 + 0.1;
  document.getElementById("demo3").innerHTML = "0.2 + 0.1 = " + x;
  
  var y = (0.2*10 + 0.1*10) / 10;
  document.getElementById("demo4").innerHTML = "0.2 + 0.1 = " + y;
  
  var x = "10";
  var y = "20";
  var z = x + y;
  document.getElementById("demo5").innerHTML = z;
  
  var x = "100";
  var y = "10";
  var z = x / y;
  document.getElementById("demo6").innerHTML = z;
  
  document.getElementById("demo7").innerHTML = 100 / "Apple";
  
  var x = 100 / "Apple";
  document.getElementById("demo8").innerHTML = isNaN(x);
  
  var myNumber = 2;
  var txt = "";
  while (myNumber != Infinity) {
     myNumber *= myNumber;
     txt = txt + myNumber + "<br>";
  }
  document.getElementById("demo9").innerHTML = txt;
  
  var myNumber = 32;
  document.getElementById("demo10").innerHTML =
  "32 = " + "<br>" +
  " Decimal " + myNumber.toString(10) + "<br>" +
  " Hexadecimal " + myNumber.toString(16) + "<br>" +
  " Octal " + myNumber.toString(8) + "<br>" +
  " Binary " + myNumber.toString(2);
  