var x;
document.writeln(x);
document.writeln("<br>");
var y = 7;
document.writeln(typeof y);

document.writeln("<br>")
var z = "Hello"
document.writeln(typeof z);

document.writeln("<br>")
var q = true;
document.writeln(typeof q)


document.writeln("<br>")
var n = null;
document.writeln(typeof n)

document.writeln("<br>")
document.writeln(typeof 3);

document.writeln("<br>")
document.writeln(typeof ("Hello" + 3))

document.writeln("<br>")
document.writeln(typeof("Hello" + (3 + 2)))

document.writeln("<br>")
document.writeln(typeof (y++))


document.writeln("<br>")
document.writeln(y = 19)

document.writeln("<br>")
document.writeln(typeof (y = 19))


document.writeln("<br>")
document.writeln(typeof (y = 19))

document.writeln("<br>")
if(5)
    document.writeln("Is 5")
else
    document.writeln("Isn't 5")


document.writeln("<br>")
x = 0
if(x = 0)
    document.writeln(x + " Is 0")
else
    document.writeln(x + " Isn't 0")