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.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AOZ
{
	class MainClass
	{
		static void Main(string[] args)
		{

			{
				StringBuilder output = new StringBuilder();
				while (true)
				{
					var input_arr = Console.ReadLine().Split(' ');
					int a = int.Parse(input_arr[0]); string op = input_arr[1]; int b = int.Parse(input_arr[2]);

					double answer;
					switch (op)
					{
						case "+":
							answer = a + b;
							break;
						case "-":
							answer = a - b;
							break;
						case "*":
							answer = a * b;
							break;
						case "/":
							answer = a / b;
							break;
						case "?":
							Console.Write(output.ToString());
							return;
						default:
							return;
					}
					output.AppendLine(answer.ToString("0"));
				}
			}
		}
	}
}