SWIFT学习笔记05

for _ in 1...power
{
    answer *= base
}

case 1...3:
naturalCount = "a few"

5、case值绑定。此样例都不是必需用default

let anotherPoint = (2, 0)
switch anotherPoint {
case (let x, 0):
println("on the x-axis with an x value of \(x)")
case (0, let y):
println("on the y-axis with a y value of \(y)")
case let (x, y):
println("somewhere else at (\(x), \(y))") } // 输出 "on the x-axis with an x value of 2"

let yetAnotherPoint = (1, -1)
switch yetAnotherPoint
{
case let (x, y)where x == y:
println("(\(x), \(y)) is on the line x == y")
case let (x, y) where x == -y:
println("(\(x), \(y)) is on the line x == -y")
case let (x, y):
println("(\(x), \(y)) is just some arbitrary point")

} // 输出 "(1, -1) is on the line x == -y"

2014年07月03日