basic43

object basic43 {
  def f(a:Int,n:Int):Int = {
    if(n==0){
      1
    }else{
      a*f(a,n-1)
    }
  }
  def main(args: Array[String]): Unit = {
    val rst = f(2,3)
    println(rst)
  }
}
```
```