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: Wrong Answer)

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string[] array = input.Split(' ');

            int a = int.Parse(array[0]);
            int b = int.Parse(array[2]);
            string op = array[1];
            int answer = 0;

            switch(op)//?????????????????????
            {
                case "+": answer = a + b;
                    Console.WriteLine(answer);
                    break;
                case "-": answer = a - b;
                    Console.WriteLine(answer);
                    break;
                case "*": answer = a * b;
                    Console.WriteLine(answer);
                    break;
                case "/": answer = a / b;
                    Console.WriteLine(answer);
                    break;
                case "?": break;
            }          
        }
    }
}