In the C language which，To convert type does not seem to how difficult，The learning Swift when there is confusion。
Which of them seem to remember spoken tutorial，But remember，This has found，On record：
|
1 2 3 4 |
假定三个变量： var i:Int = 5 var f:Float = 3.3 var d:Double = 4.455 |
To convert to Double Int or Float ，It is as follows
[cr[……]