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: Accepted)

import scala.annotation.tailrec

object Main {
  def main(args: Array[String]): Unit = {
    val sc = new java.util.Scanner(System.in)

    @tailrec
    def sub(a: Int, op: String, b: Int): Unit = {
      op match {
        case "+" =>
          println(a + b)
          sub(sc.nextInt, sc.next, sc.nextInt)
        case "-" =>
          println(a - b)
          sub(sc.nextInt, sc.next, sc.nextInt)
        case "*" =>
          println(a * b)
          sub(sc.nextInt, sc.next, sc.nextInt)
        case "/" =>
          println(a / b)
          sub(sc.nextInt, sc.next, sc.nextInt)
        case _ =>
      }
    }
    sub(sc.nextInt, sc.next, sc.nextInt)

  }
}