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: Accepted)

import java.io.BufferedInputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main{
	   public static void main(String[] args) {
	        Scanner stdin  = new Scanner(new BufferedInputStream(System.in));
	        List<String> output = new ArrayList<String>();
	        while (stdin.hasNext()) {
	            String input = stdin.nextLine();
	            String[] in = input.split(" ");
	            int a = Integer.parseInt(in[0]);
	            String op = in[1];
	            int b = Integer.parseInt(in[2]);
	 
	            if ("?".equals(op)) {
	                break;
	            } else {
	                if (a >= 0 && a <= 20000 && b >= 0 && b <= 20000) {
	                    if ("+".equals(op)) {
	                        int result = a + b;
	                        output.add(String.valueOf(result));
	                    } else if ("-".equals(op)) {
	                        int result = a - b;
	                        output.add(String.valueOf(result));
	                    } else if ("*".equals(op)) {
	                        int result = a * b;
	                        output.add(String.valueOf(result));
	                    } else if ("/".equals(op)) {
	                        if (b != 0) {
	                            int result = a / b;
	                            output.add(String.valueOf(result));
	                        }
	                    }
	                }
	            }
	        }
	        for (String out : output) {
	            System.out.println(out);
	        }
	    }
	 
	
}