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;
 
class Program
{
    static void Main()
    {
        int ans = 0;
        // Loop
        while (true)
        {
            // Input
            var input = Console.ReadLine();
            var values = input.Split(' ');
            int a = int.Parse(values[0]);
            int b = int.Parse(values[2]);
            string op = values[1];
 
            if (op == "+")
            {
                ans = a + b;
            }
            else if (op == "-")
            {
                ans = a - b;
            }
            else if (op == "*")
            {
                ans = a * b;
            }
            else if (op == "/")
            {
                ans = a / b;
            }
            else if (op == "?")
            {
                // Loop end.
                break;
            }
            else
            {
                continue;
            }
            // Output
            Console.WriteLine("{0}", ans);
        }
    }
}