【Javascript】Why do these increments and decrements NOT show on the browser?

Question

Hi, I just recently started to study coding and I am a new learner of Javascript.

Increments and decrements do not properly show on my browser, and I'd like to know why. Did I make any mistake or are these originally the numbers that cannot be shown by themselves?

These did not work;
var f = 5 ++;
var g = 5 --;
var h = ++ 5;
var i = -- 5;
document.write(f);
document.write(g);
document.write (h);
document.write(i);

These worked;
var x = 5 - 5;
var a = 5 + 5;
var b = 5 * 5;
var d = 5 / 5;
var e = 5 % 5;
document.write(a + x + b + "<BR/>");
document.write(d + "<BR/>");
document.write(e + "<BR/>");
document.write(x + "<BR/>");
document.write(a + "<BR/>");

Btw, I checked several times if there are any minor mistakes on forgetting ";" or spaces between numbers and "++" or "--".

I'd appreciate it if someone can help me on this.
Thank you.

Answer 1

increment and decrement operators are used on variables not on numbers

Answer 2

try:

var f = 5;
f++;
document.write(f);

Answer 3

Sreejith
Uhhh now I understand. Thank you for your help!

Answer 4

Ulisses Cruz
I tried the coding and it worked well!Thank you so much :D