Problem:
Simple Calculator

Write a program which reads two integers a, b and an operator op, and then prints the value of a op b.

The operator op is '+', '-', '*' or '/' (sum, difference, product or quotient). The division should truncate any fractional part.

Input

The input consists of multiple datasets. Each dataset is given in the following format.

a op b

The input ends with a dataset where op = '?'. Your program should not process for this dataset.

Output

For each dataset, print the value in a line.

Constraints

0 ≤ a, b ≤ 20000

No divisions by zero are given.

Sample Input 1

1 + 2
56 - 18
13 * 2
100 / 10
27 + 81
0 ? 0

Sample Output 1

3
38
26
10
108

Solution in Scala (judge verdict: Runtime Error)

import scala.io.Source

object Main{
  def main(args: Array[String]){
    var list = List[String]()
    for(in <- Source.stdin.getLines.toList){
      list = in :: list
    }

    for(i <- 0 until list.length){
      val arr = list(list.length - i - 1).split(Array(' '))

      arr(1) match {
        case "+" => println(arr(0).toInt + arr(2).toInt)
        case "-" => println(arr(0).toInt - arr(2).toInt)
        case "*" => println(arr(0).toInt * arr(2).toInt)
        case "/" => println(arr(0).toInt / arr(2).toInt)
        case "?" =>
      }
    }
  }
}