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: WA: Presentation Error)

using System;

namespace teisyutusensei
{
    class Program
    {
        static void Main(string[] args)
        {
            

            string result =null;
            bool fr = true;

            while(fr)
            {
                ////?????????????????????
                string dmmy = Console.ReadLine();

                string[] input = dmmy.Split(' ');

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


                switch (op)
        	    {
                    case "+":
                        result += a+b;
                        result += "\n";
                        break;
                    case "-":
                        result += a - b;
                        result += "\n";
                        break;
                    case "*":
                        result += a * b;
                        result += "\n";
                        break;
                    case "/":
                        result += a / b;
                        result += "\n";
                        break;
                    default:
                        fr = false;
                        result += "\n";
                        break;
	            }
            }

            Console.WriteLine(result);
            Console.ReadLine();

        }
    }

}