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: Runtime Error)

import java.util.Scanner;

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

        for(int i = 0; i < 20_000; i++){
            int a = scanner.nextInt();
            String op = scanner.next();
            int b = scanner.nextInt();

            if(a == 0 && b == 0){
                break;
            }else if(op.equals("+")){
                System.out.println(a+b);
            }else if(op.equals("-")){
                System.out.println(a-b);
            }else if(op.equals("*")){
                System.out.println(a*b);
            }else if(op.equals("/")){
                System.out.println(a/b);
            }
        }
        scanner.close();
    }
}