Doubt in display id name salary before display function

Question

Why is display(id, name, salary) mentioned before display function in the code provided below:

object example1 {

  def main(args:Array[String]) {

    val id = new Array[Int](5)

    println("Enter id")

    for (i <- 0 to 4) {

      id(i) = scala.io.StdIn.readInt()

    }

    val name = new Array[String](5)

    println("Enter name")

    for (i<-0 to 4){

    name(i) = scala.io.StdIn.readLine()

    }

  val salary = new Array[Int](5)

  println("Enter salary")

  for (i<-0 to 4){

    salary(i)= scala.io.StdIn.readInt()

  }

  display(id, name, salary)

   def display(id:Array[Int],name:Array[String],salary:Array[Int]) = {

     id.foreach(println)

     name.foreach(println)

     salary.foreach(println)

    }

  }

}

Answer 1

The statement display(id, name, salary) is written before the display function to call the display function. If we don't write that statement, the display function will not be called and it will not be executed. Also, while calling the display function we are passing the parameters: id, name, and salary.