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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		String[] strArray;
        int a, b;
        String op;

		while(true) {
			strArray = br.readLine().split(" ");
	        a = Integer.parseInt(strArray[0]);
	        b = Integer.parseInt(strArray[2]);
	        op = strArray[1];

	        if(a==0 && b==0 && op.equals("?")) {
	        	break;
	        }

	        switch(op) {
	        case "+":
	        	sb.append(a+b + "\n");
	        	break;
	        case "-":
	        	sb.append(a-b + "\n");
	        	break;
	        case "*":
	        	sb.append(a*b + "\n");
	        	break;
	        case "/":
	        	sb.append(a/b + "\n");
	        	break;
	        }

		}
        System.out.print(sb);
	}
}