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: Accepted)

"use strict";
process.stdin.resume();
process.stdin.setEncoding('utf8');

var lines = []
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});

reader.on('line', (line) => {
  lines.push(line);
});

reader.on('close', () => {
    for (var line of lines) {
	let l = line.trim().split(' ');
	let a = parseInt(l[0]);
	let op= l[1];
	let b = parseInt(l[2]);

	//console.log('a: ', a,'op: ', op, 'b: ', b);
	if (op==='?') {
	    break;
	}
	console.log(aux(a, op, b));
    }
});

function aux(a,op,b)
{
    var s;

    if (op==='+') {
	s = a + b;
    } else if (op==='-') {
	s = a - b;
    } else if (op==='*') {
	s = a * b;
    } else if (op==='/') {
	s = Math.floor(a/b);
    }

    return(s);
}