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;

class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int a, b, answer = 0;
		String operator;

		while (true) {
			a = scanner.nextInt();
			operator = scanner.next();
			b = scanner.nextInt();

			if (operator.equals("+"))
				answer = a + b;
			else if (operator.equals("-"))
				answer = a - b;
			else if (operator.equals("*"))
				answer = a * b;
			else if (operator.equals("/"))
				answer = a / b;

			if (a == 0 && b == 0 && operator.equals("?"))
				break;

			System.out.println((int) answer);
		}
	}
}