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 競プロ_Csharp {
    class Program {
        static void Main(string[] args) {

            while (true) {

                String[] a = NextStrings();
                if (a[1].Equals("?")) return;

                int ans = 0;
                int b = int.Parse(a[0]), c = int.Parse(a[2]);

                switch (a[1]) {
                    case "+":
                        ans = b + c;
                        break;
                    case "-":
                        ans = b - c;
                        break;
                    case "*":
                        ans = b * c;
                        break;
                    case "/":
                        ans = b / c;
                        break;
                }

                Println(ans);

            }

        }

        public static void Println (Object o) {
            Console.WriteLine(o);
        }

        public static string NextString() {
            return Console.ReadLine();
        }

        public static string[] NextStrings () {
            return Console.ReadLine().Split();
        }

        public static int NextInt () {
            return int.Parse(Console.ReadLine());
        }

        public static int[] NextInts () {
            string[] a = Console.ReadLine().Split();
            int[] b = new int[a.Length];
            for (int i = 0; i < a.Length; i++) {
                b[i] = int.Parse(a[i]);
            }
            return b;
        }

        public static double NextDouble () {
            return double.Parse(Console.ReadLine());
        }

    }
}