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;
namespace ITP1_4_B
{
    class Problem
    {

        public static List<string[]> getinputdata (){

            List<string[]> list_temp = new List<string[]>();
            string strdata = Console.ReadLine ();

            while (strdata!=null) {

                string[] s_temp = strdata.Split (' ');

                list_temp.Add (s_temp);

                strdata = Console.ReadLine ();

            }

            return list_temp;
        }

        public static void Main (string[] args)
        {
            List<string[]> list_result = new List<string[]>();
            list_result = getinputdata ();

            int a;
            string op;
            int b;

            for (int i = 0; i < list_result.Count; i++){
                
                a = int.Parse(list_result[i][0]);
                op = list_result[i][1];
                b = int.Parse(list_result[i][2]);

                    switch (op)
                    {
                        case "+":

                            Console.WriteLine(a + b);
                            break;

                        case "-":

                            Console.WriteLine(a - b);
                            break;
                        case "*":


                            Console.WriteLine(a * b);
                            break;
                        case "/":


                            Console.WriteLine(a / b);
                            break;

                    }

            }

        }
    }
}