What does and exclamnation mark mean in scripts?

Questions & Answers
1

Hello everyone, this may be the silliest question I’m ever to ask, but if you don’s ask, you don’t know. as title sasy in many scrips I use there seems to be an exclamation mark in them, I don’t quite understand it’s use. I don’t even dare gues in case I’m wrong.

Below, from Turn light on/off - Questions & Answers - Unity Discussions You’ll see a scriot where an exclamation mark is used, and i think I know what it does… but yeah some clarification would be great!

"You can toggle any bool by setting it to the opposite of its current value:

myBool = !myBool;

So you can toggle a light source by toggling its enabled state:

myLight.enabled = !myLight.enabled;

Now you want to do that if you press a certain button:

Light myLight = lightPoint.GetComponent("Light");
if (Input.GetButtonDown("Fire1")) {
    myLight.enabled = !myLight.enabled;
}

"

2

! is the negation operator. It means "not", as in !True = False.

So, to clarify, when someone writes:

Light.enabled = !Light.enabled;

In english, that reads: "Set light to the opposite of what it currently is". Hence the idea of a "toggle". :P