scala> def MyWhile(p: => Boolean)(b: => Unit):Unit = {
     | if(p) {
     |   b
     |   MyWhile(p)(b)
     | }
     | }
MyWhile: (p: => Boolean)(b: => Unit)Unit

scala> var i = 0
i: Int = 0

scala> MyWhile(i<10) {
     |   println(i)
     |   i = i +1
     | }
0
1
2
3
4
5
6
7
8
9

scala>