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

namespace SimpleCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                string line = Console.ReadLine();
                string[] strs = line.Split(' ');
                int lValue = int.Parse(strs[0]);
                string op = strs[1];
                int rValue = int.Parse(strs[2]);
                SimpleCalculator problem = new SimpleCalculator();
                if (op.Equals("?")) break;

                int answer = 0;
                if (op.Equals("+")) answer = problem.Sum(lValue, rValue);
                if (op.Equals("-")) answer = problem.Sub(lValue, rValue);
                if (op.Equals("*")) answer = problem.Mul(lValue, rValue);
                if (op.Equals("/")) answer = problem.Div(lValue, rValue);
                Console.WriteLine(answer);
                
            }
        }
    }

    /// <summary>
    /// 単純な計算機クラス
    /// </summary>
    public class SimpleCalculator
    {
        public int Sum(int lValue, int rValue)
        {
            return lValue + rValue;
        }

        public int Sub(int lValue, int rValue)
        {
            return lValue + rValue;
        }

        public int Mul(int lValue, int rValue)
        {
            return lValue * rValue;
        }

        public int Div(int lValue, int rValue)
        {
            return lValue / rValue;
        }

    }
}