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 JavaScript (judge verdict: Wrong Answer)

'use strict';
(function(stdin) {
  //declare function
  var calculation = function(array) {
      if (array[1] === '+') {
        return Number(array[0]) + Number(array[2]);
      }
      if (array[1] === '-') {
        return array[0] - array[2];
      }
      if (array[1] === '*') {
        return array[0] * array[2];
      }
      if (array[1] === '/') {
        return parseInt(array[0] / array[2]);
      }
      if (array[1] === '%') {
        return array[0] % array[2];
      }
    }
    //declare variable
  var inputs = stdin.toString().trim().split('\n');
  var cols = inputs.splice(0, inputs.indexOf('0 ? 0')).map(function(v) {
    return v.split(' ');
  });
  //main
  cols = cols.map(calculation).join('\n');
  //display
  console.log(cols);
})(require('fs').readFileSync('/dev/stdin', 'utf8'));