<!-- About the Go Playground --><divclass="left-column"><p>The Go Playground is a web service that runs on <ahref="http://golang.org/">golang.org</a>'s servers.The service receives a Go program, compiles, links, and runs the program inside a sandbox, then returns the output.</p><p>There are limitations to the programs that can be run in the Playground.They must be single-threaded (but they may use many goroutines).There are also limits on execution time, and CPU and memory usage.The Playground can access only a subset of the standard library(notably absent are network and filesystem access).Therefore, the only communication a Playground program has to the outside worldis via standard output.</div><divclass="right-column"><script src="http://www.google.com/jsapi"type="text/javascript"></script><divid="playground"class="small"></div><script src="/doc/play/playground.js"></script></div><divclass="end-columns"></div>