ProjectEuler1.scala

/*execute with: $ scala name_of_file.scala*/

def ProjectEuler1(limit:Long) = {
    def rec(sum:Long , limit:Long , cur:Long):Long = {
        if (limit==cur) sum
        else if ( cur%3==0 || cur%5 == 0) rec(sum+cur,limit,cur+1)
        else rec(sum,limit,cur+1)
    }
    rec(0,limit,1)
  }

println(ProjectEuler1(1000))