Banking Transactions Program in Scala

Banking.scala:
-------------
package com.spark.scala.learning

object Banking {
def main(args:Array[String]):Unit = {
  val ob:BankingTransactions = new BankingTransactions

  while(true)
  {
    println("1 . Deposit \n 2. Withdrawal \n 3. Balance Check \n 4. Close")
    println("Enter your choice:\t")
    val ch:Int = scala.io.StdIn.readInt()
    ch match{
      case 1 =>
        println("Enter the amount to deposit:\t")
        val depositAmount:Long = scala.io.StdIn.readLong()
        val bal_deposit:Long = ob.deposit(depositAmount)
        println("The balance after deposit is " + bal_deposit)

      case 2=>
        println("Enter the amount to withdraw: \t")
        val withdrawlAmount:Long = scala.io.StdIn.readLong()
        val bal_withdrawn :Long = ob.withdrawal(withdrawlAmount)
        if (bal_withdrawn <0)
            println("Insufficient Funds")
        else
            println("The Balance after Withdrawal is "+bal_withdrawn)

      case 3=>
          val bal_check:Long = ob.balanceCheck()
        println("The balance is " + bal_check)

      case 4=>
          System.exit(0)
      case _=>
        println("Bad Choice")
    }
  }
}
}


BankingTransactions.scala:
-------------------------
package com.spark.scala.learning

class BankingTransactions {
var bal:Long = 0
  def deposit(amount:Long):Long = {
    bal = bal + amount
    bal
  }

  def withdrawal(amount:Long):Long = {
    if (bal - amount < 0){
      bal
    }
    bal = bal - amount
    bal
  }

  def balanceCheck():Long={
    bal
  }
}






1 . Deposit
 2. Withdrawal
 3. Balance Check
 4. Close
Enter your choice:
1
Enter the amount to deposit:
100
The balance after deposit is 100
1 . Deposit
 2. Withdrawal
 3. Balance Check
 4. Close
Enter your choice:
2
Enter the amount to withdraw:
30
The Balance after Withdrawal is 70
1 . Deposit
 2. Withdrawal
 3. Balance Check
 4. Close
Enter your choice:
3
The balance is 70
1 . Deposit
 2. Withdrawal
 3. Balance Check
 4. Close
Enter your choice:
234
Bad Choice
1 . Deposit
 2. Withdrawal
 3. Balance Check
 4. Close
Enter your choice: