Swift code printing X in the screen.

gistfile1.txt

let matrixSize = 10
for y in 0..<matrixSize {
    var line = ""
    for x in 0..<matrixSize {
        let point = (x, y)
        switch point {
            case let (x, y) where x == y:
                line.append("#")
            case let (x, y) where y == matrixSize-1 || y == 0 || x == 0 || x == matrixSize-1:
                line.append("#")
            case let (x, y) where x + y == matrixSize-1:
                line.append("#")
            default: line.append(" ")
        }
    }
     print(line)
}