while

var isBool = true

var number = 0

while isBool {

    print("origin number : \(number), ", terminator: "")

    number += 1

    print("current number : \(number)")

    if number == 10 {

        isBool = false

    }

}

/*

 result :

 origin number : 0, current number : 1

 origin number : 1, current number : 2

 origin number : 2, current number : 3

 origin number : 3, current number : 4

 origin number : 4, current number : 5

 origin number : 5, current number : 6

 origin number : 6, current number : 7

 origin number : 7, current number : 8

 origin number : 8, current number : 9

 origin number : 9, current number : 10

 */