writing xcode apps on my ipad

No. Unless you mean something like using VNC to remote control your Mac.

 

This topic has come up before. It might be possible to have your source files on the iPad and edit them but there's little likelihood of having gcc present to check syntax. In theory Apple could do this if they wanted but I doubt that they would.

 

I've done it, using VNC and RDP apps. Sort of usable, but the current Xcode UI really needs a larger display. If you know how to develop using the command-line, SSH-ing into a Mac actually works better. You can use iDisk or something like DropBox to have your source code files accesible from both the iPad and the Mac.

A touch-centered UI that runs Xcode remotely via AppleScript or some other protocol sent over the net might be the way to go.