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 ITP1_4_C
{
    class Program
    {
        static void Main(string[] args)
        {

            while (true)
            {
                //2つの整数a,bと1つの演算子opを読み込んで、a op bを計算する。
                //opは+,-,*,/のみ。割り切れない場合は小数点以下を切り捨てる。
                //opが?の時、入力を終了し結果は出力しない。

                string[] s = Console.ReadLine().Split(' ');
                int a = int.Parse(s[0]);
                int b = int.Parse(s[2]);
                string op = s[1];

                if (op == "+")
                {
                    Console.WriteLine(a + b);
                }

                else if (op == "-")
                {
                    Console.WriteLine(a - b);
                }

                else if (op == "*")
                {
                    Console.WriteLine(a * b);
                }

                else if (op == "/")
                {
                    Console.WriteLine(a / b);
                }

                else
                {
                    break;
                }

                //Console.ReadKey();
            }
        }
    }
}