>> Should you use the tab button or five spaces when you're indenting source code?<p>Five? What sort of freak uses five?<p>And you should use the tab button, with your editor set up to insert <i>four</i> spaces instead of tab characters. This way display is consistent across editors, platforms etc etc<p>I must say I'm surprised at the result for 'C' on there, as I've never worked with a C programmer that used tabs.