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Another lisp question

From: Klaus Jantzen
Subject: Another lisp question
Date: Thu, 15 Apr 2010 18:13:26 +0200
User-agent: Mozilla-Thunderbird (X11/20090707)


in an interactive function I have

(interactive  "sEnter number: ")

When hitting <Enter> without entering anything, emacs comes back to the input request. How can I find out, that nothing has been entered so that I can use e.g. a default value?

Thanks for a pointer.



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