Re: dumb coding ??

From: Daniel Koepke (dkoepke@CALIFORNIA.COM)
Date: 10/29/97

On Wed, 29 Oct 1997, Tom Whiting wrote:

%gcc -c -g -O -Wall -fno-strict-prototypes  act.informative.c
%act.informative.c: In function `do_toggle':
%act.informative.c:1600: called object is not a function
%act.informative.c:1610: warning: too few arguments for format

The "called object is not a function" usually happens when you refer
to an element in a table using paranthesis instead of brackets.  That
is, instead of the proper 'name[2]' you do 'name(2)'.  The latter
is the syntax for passing arguments to a function or a macro, not to
index an array (the former, using the brackets).

As for the "too few arguments for format", this is (most likely) a
sprintf() call.  sprintf() expects a certain number (and type) of
arguments in accordance to the given format.

  sprintf(buf, "This is the format string.  One integer expected %d.");

will generate the "too few arguments for format" error because it
expects one integer (in general, all things preceeded by a percent
sign are format codes; any and all books on C will tell you how to
use printf()/sprintf()/fprintf(), so I would suggest looking there
for more specifics).  To fix this error (warning, actually, because
it is non-fatal, and while the code will run fine; it probably won't
have the intended result) you simply need to locate which variable
is not being passed to sprintf() and add it into the appropriate
place in the sprintf() statement.  This may seem easy to some, but
it can be complicated.  The easiest case is (as in our example above)
where you just forgot the last [and in this case, the first] argument.
If our variable was 'i' (and it was as an 'int') we would do:

  sprintf(buf, "This is the format string.  One integer expected %d.", i);

and the error would disappear.  Additionally, the value of i would be
inserted in the place of '%d'.

I grow tired of saying, "CircleMUD isn't a tool for learning C."  It
isn't neccessarily true, so why should I bother?  Whatever it takes
to help you learn, can be considered a tool to help you learn.  But I
will say, and I doubt I will ever say anything to the contrary, that
the CircleMUD mailing list is not a tool to aid you in learning C.
If you insist on learning C using CircleMUD, then do it on your own,
or with the help of a book, or with questions asked on appropriate
newsgroups.  BTW, when I say, 'you', I don't exclusively mean the
person to whom I am responding.  Though it is poor style, and rather
ambiguous, by 'you' I mean--more or less--all of the newbies whom have
asked basic C questions on the list; or those whom are contemplating
doing so.

Daniel Anton Koepke -:- -:- [Nether]
"Human language is a cracked kettle on which we beat out tunes
 for bears to dance to when all the while we want to move the
 stars to pity." -- Flaubert

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