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: Runtime Error)

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

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

            List<string> all = new List<string>();

            while (true) 
            {
                string temp = Console.ReadLine();

                if (temp.Equals("0 ? 0"))
                {
                    break;
                }

                string[] temp2 = temp.Split(' ');
                foreach (string item in temp2)
                {
                    all.Add(item);
                }
            }

            for (int i = 0; i < all.Count; i += 3)
            {
                switch (all[i + 1])
                { 
                    case "+":
                        Console.WriteLine(int.Parse(all[i]) + int.Parse(all[i + 2]));
                        break;
                    case "-":
                        Console.WriteLine(int.Parse(all[i]) - int.Parse(all[i + 2]));
                        break;
                    case "*":
                        Console.WriteLine(int.Parse(all[i]) * int.Parse(all[i + 2]));
                        break;
                    case "/":
                        Console.WriteLine(int.Parse(all[i]) / int.Parse(all[i + 2]));
                        break;
                }
            }
            
        }
    }
}