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 JAVA (judge verdict: Time Limit Exceeded)

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int a = sc.nextInt();
        String op = sc.next();
        int b = sc.nextInt();

        while(true) {
            switch (op) {
                case "+":
                    System.out.println(a + b);
                    break;
                case "-":
                    System.out.println(a - b);
                    break;
                case "*":
                    System.out.println(a * b);
                    break;
                case "/":
                    System.out.println(a / b);
                    break;
                default:
                    return;
            }
        }
    }
}