Swift--Swift code

Property Monitor

Class square{

var width:double = 0 {

willset{

println ("willset--newvalue = \ (newvalue), CurrentValue = \ (width)")

}

didset{

println ("didset--oldValue = \ (oldValue), CurrentValue = \ (width)")

}

}

var girth:double {

get{

Return width * 4

}

set{

println ("Call the Set method of girth")

width = NEWVALUE/4

}

}

}

var s = Square ()

S.width = 5

S.girth

S.girth = 200

******************************************

The first parameter name of a method is only a local parameter name, and the other parameter name is both a local parameter name and an external parameter name

Class calculate{

Func sum (num1:int, num2:int), int{

return NUM1 + num2

}

Func Mul (Num1:int, Number2 num2:int, _ Num3:int), int{

return NUM1 * num2 * num3

}

}

var c = Calculate ()

C.sum (9, Num2:10)

C.mul (3, Number2:9, 10)

Swift--Swift code