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;

namespace ITP1_4_C
{
	class Program
	{
		class SimpleCalc
		{
			private int a = 0;
			private char op = '?';
			private int b = 0;

			public SimpleCalc(string[] args)
			{
				a = int.Parse(args[0]);
				op = args[1][0];
				b = int.Parse(args[2]);
			}

			public int Calc()
			{
				int ans = 0;

				switch(op) {
				case '+':
					ans = a + b;
					break;
				case '-':
					ans = a - b;
					break;
				case '*':
					ans = a * b;
					break;
				case '/':
					ans = a / b;
					break;
				}

				return ans;
			}
		}

		static void Main(string[] args)
		{
			List<SimpleCalc> cs = new List<SimpleCalc>();

			while(true) {
				string[] vs = Console.ReadLine().Split(' ');

				if(vs[1] == "?") {
					break;
				}

				cs.Add(new SimpleCalc(vs));
			}

			foreach(SimpleCalc c in cs) {
				Console.WriteLine(c.Calc());
			}
		}
	}
}