Write a program to find maximum and minimum of an array

object Demo1
{
def main(args:Array[String])
{
print("How Many Elements do u want in Array = ")
var n = scala.io.StdIn.readInt()
var arr = new ArrayInt
for(b<-0 to (arr.length-1))
{
print("Enter Number = ")
arr(b) = scala.io.StdIn.readInt()
}
var max:Int = arr(0)
var min:Int = arr(0)
for(i<-0 to (arr.length-1))
{
if(arr(i) > max)
{
max = arr(i)
}
if(arr(i) < min)
{
min = arr(i)
}
}
println("Maximun number is = "+max)
println("Minimum number is = "+min)
}
}