From: Cecil Westerhof <dummy@dummy.nl>
To: help-gnu-emacs@gnu.org
Subject: Checking parameters
Date: Sun, 17 Jun 2007 12:17:08 +0200 [thread overview]
Message-ID: <46750a24$0$338$e4fe514c@news.xs4all.nl> (raw)
I am new to Emacs and lisp.
What is the best way to check parameters and do error handling when they are
not correct?
I have the following function:
(defun getHours(time)
(interactive "sHH:MM: ")
(let ((timelist (split-string time ":")))
(+
(string-to-number (car timelist))
(/
(string-to-number (cadr timelist))
60.0
)
)
)
)
How do I check that there is exactly one parameter? And how do I check the
format and give an error that works in interactive and normal mode?
For example when I give
(getHours "0:120")
I get
2.0
How should I generate an error/exception?
next reply other threads:[~2007-06-17 10:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-17 10:17 Cecil Westerhof [this message]
2007-06-17 10:55 ` Checking parameters Lennart Borgman (gmail)
2007-06-17 11:18 ` Lennart Borgman (gmail)
2007-06-17 15:28 ` Nikolaj Schumacher
[not found] ` <mailman.2283.1182079099.32220.help-gnu-emacs@gnu.org>
2007-06-17 18:01 ` Cecil Westerhof
2007-06-18 17:27 ` don provan
2007-06-17 13:18 ` Tim X
2007-06-17 18:08 ` Cecil Westerhof
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