hideki/pow.js

## pow.js
var http = require('http');
var url = require('url');
var host = process.env.VCAP_APP_HOST || 'localhost';
var port = process.env.VCAP_APP_PORT || 3000;

var pow = function(x, n) {
	if(n < 0){
		return 0;
	}

	if(n === 0){
		return 1;
	}
	var temp = pow(x, Math.floor(n/2));
	if(n % 2 === 0){
		return temp * temp;
	}
	else{
		return temp * temp * x;
	}
};

http.createServer(function (req, res) {
  	res.writeHead(200, {'Content-Type': 'text/html'});
  	res.write('<html><body>');
  	res.write('<h1>Power function with Node.js</h1>');
	var urlObj = url.parse(req.url, true);
	var uri = urlObj.pathname;
    if(uri === "/pow") {
		var query = urlObj.query;
		var base = parseInt(query.base);
		var exponent = parseInt(query.exponent);
		if(base && exponent){
  			res.write('pow('+base+', '+exponent+') = ' + pow(base, exponent));
 			res.write('<hr/>');
		}
	}
  	res.write('<form method="get" action="/pow">');
 	res.write('<table>');
  	res.write('<tr><td>base</td><td><input type="text" name="base"/></td></tr>');
  	res.write('<tr><td>exponent</td><td><input type="text" name="exponent"/></td></tr>');
 	res.write('</table>');
  	res.write('<input type="submit" value="pow"/>');
  	res.write('</form>');
  	res.end('</body></html>');
}).listen(port, null);

console.log('Server running at http://' + host + ':' + port + '/');
	var http = require('http');
	var url = require('url');
	var host = process.env.VCAP_APP_HOST \|\| 'localhost';
	var port = process.env.VCAP_APP_PORT \|\| 3000;

	var pow = function(x, n) {
	if(n < 0){
	return 0;
	}

	if(n === 0){
	return 1;
	}
	var temp = pow(x, Math.floor(n/2));
	if(n % 2 === 0){
	return temp * temp;
	}
	else{
	return temp * temp * x;
	}
	};

	http.createServer(function (req, res) {
	res.writeHead(200, {'Content-Type': 'text/html'});
	res.write('<html><body>');
	res.write('<h1>Power function with Node.js</h1>');
	var urlObj = url.parse(req.url, true);
	var uri = urlObj.pathname;
	if(uri === "/pow") {
	var query = urlObj.query;
	var base = parseInt(query.base);
	var exponent = parseInt(query.exponent);
	if(base && exponent){
	res.write('pow('+base+', '+exponent+') = ' + pow(base, exponent));
	res.write('<hr/>');
	}
	}
	res.write('<form method="get" action="/pow">');
	res.write('<table>');
	res.write('<tr><td>base</td><td><input type="text" name="base"/></td></tr>');
	res.write('<tr><td>exponent</td><td><input type="text" name="exponent"/></td></tr>');
	res.write('</table>');
	res.write('<input type="submit" value="pow"/>');
	res.write('</form>');
	res.end('</body></html>');
	}).listen(port, null);

	console.log('Server running at http://' + host + ':' + port + '/');