Created
April 26, 2011 08:34
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simple power function demo using Node on cloudfoundry.com
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| 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 + '/'); |
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