Explain the naming rules for creating variables, and then provide three examples using the data types int, double, and char and assign values to them.

I will answer for jа vascript language.

Naming rules for creating variables:

The first character must begin with:

Letter of the alphabet. Underscore (_) (not recommended). The dollar sign ($). (not recommended).

After the first character:

Letters. Digits 0 to 9. No spaces or special characters are allowed.

About length:

No limit of length but is not recommended to use large names.

About case-sensitive:

Uppercase letters are distinct from lowercase.

About reserved words:

You can't use a jа vascript reserved word for a name.

Example:

var ten = 10;

var pi = 3.14;

var name = 'Josh';