Help me please!!

Question

var x = 4;
var y = 5;
var d = 4 + z;
var z = y - x;
var c = x + z + d + y;
alert(c);
Why result is NaN, not 15? I don't understand !!

Answer 1

z is not defined

Answer 2

you are trying to add z before declaring it.

Move var d = 4+z after the line var z = y-x

Answer 3

He is very correct, your placement was just a bit off, keep up the energy and stay invested.

var x = 4;
var y = 5;
var z = y - x;
var d = 4 + z;
var c = x + z + d + y;
alert(c);

Answer 4

Hey,are you related to a guy named vy nguyen?

Answer 5

No. I don't know who named vy nguyen. #Samuel Adams

Answer 6

Oh. Thank you very much!!

Answer 7

move z=y-x before d=4+z