A variable is an identifier for a memory location that holds a value. A simpler way to describe a variable is an identifier that holds a value. Consider the following program:
fun main(args: Array<String>) { var x: Int = 1}
The preceding x is a variable and the value it holds is 1. More specifically, x is an integer variable. The x is referred to as an integer variable because x has been defined to have the Int data type. As such, the x variable can only hold an integer value. To be more accurate, we say that x is an instance of the Int class. At this point, you must be wondering what the words instance and class mean in this context. All will be revealed in due time. For now, let's focus on the topic of variables.
When defining ...
