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# Where does x and y value come from?

In the video after Pasan has written everything out, including the two For Loops, where does the initial value of x and y come from? How is the loop calculating the "for xCoord in (x-range)...(x+range)" if we don't set x to, say, 0?

struct Point {

```let x: Int
let y: Int

init(x: Int, y: Int) {
self.x = x
self.y = y

}

func surroundingPoints(withRange range: Int = 1) -> [Point] {

var results: [Point] = []
for xCoord in (x-range)...(x+range) {
for yCoord in (y-range)...(y+range) {
let coordinatePoint = Point(x: xCoord, y: yCoord)
results.append(coordinatePoint)
}

}
return results
}
```

}

because it does not need to know what x is yet it will know when you pas numbers through it like so :

//when you call the Point struct Point(x: 10, y: 20)

then because of the "surroundingPoints" function built in. The point also knows the surrounding points and you can call that later i believe he will talk more about it. hope that makes some since.

## 1 Answer

PLUS

The values will come when the parameters get passed from the calling function. Here the code is for defining the functions & the variable space, but not values yet.