scala - Cannot compile example -

i have class:

 class rational(n:int, d:int) {   require(d!=0)    private val g = gcd(n.abs, d.abs)    val numer = n/g   val denom = d/g    def this(n: int) = this(n, 1);    def add(that:rational): rational = new rational(numer * that.denom + that.numer * denom, denom * that.denom)    override def tostring = numer+"/"+denom;    private def gcd(a: int, b: int): int = if(b==0) else gcd(b, % b) } 

and test class:

import rational  object test extends app {   val x = new rational(1/2)   println("hello"); } 

i'm trying compile them using

scalac test.scala rational.scala 

but following error:

test.scala:3: error: '.' expected ';' found. object test extends app { ^ 1 error found 

can guide me why not compiling. basic error

import rational not valid syntax (because it's class)

as in default package, don't need import anyway