How to change between two color?

Question

I want to change between two button text color everytime the button is pressed.
But I can change color only 3 times. After that how many times I pressed the color was not changed. Whats wrong with my code?
https://code.sololearn.com/Wfn1j0YfMdQ5/?ref=app

Answer 1

Change "/" to "%" in JS...

( var num = 0;
function show() {
var x = document.getElementById("btn");
if (num%2 == 0)
x.style.color ="yellow";
else
x.style.color ="green";
num++;
} )

Answer 2

Thanks..:)