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 C# (judge verdict: Accepted)

using System;
using System.Threading;

public class calculator
{
    public static void Main()
    {
        while (true)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            if (line[1] == "?") goto readend;
            var a = int.Parse(line[0]);
            var b = int.Parse(line[2]);
            switch(line[1])
            {
                case "+":
                    Console.WriteLine(a + b);
                    break;
                case "-":
                    Console.WriteLine(a - b);
                    break;
                case "*":
                    Console.WriteLine(a * b);
                    break;
                case "/":
                    Console.WriteLine(a / b);
                    break;
                default:
                    break;


            }
        }
    readend:;
    }
}