swift变量交换赋值

 

重点在&

 

 1 func jiaohuan(inout a: Int,inout b: Int)
 2 {
 3     let temp = a
 4     a = b
 5     b = temp
 6 }
 7 var aa = 5
 8 var a1 = 10
 9 jiaohuan(&aa,b: &a1)
10 print("\(aa)，\(a1)")