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Top Forums Programming Using write() with integers in C Post 302166289 by pflynn on Monday 11th of February 2008 01:46:39 PM
Old 02-11-2008
Quote:
Originally Posted by h@run
also: using itoa() produces a " warning: implicit declaration of function 'itoa' " even though i have #included stdlib.h
This is because itoa is not an ANSI C function (though its converse function, atoi, does) so its prototype is not in the stdlib.h header file as you would expect. Probably it is even not supported by your environment. jim mcnamara showed us the portable way one can format an integer into a string using the ANSI sprintf function (check also its secure version, snprintf).
 

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WRITE(1)						      General Commands Manual							  WRITE(1)

NAME
write - write to another user SYNOPSIS
write user [ ttyname ] DESCRIPTION
Write copies lines from your terminal to that of another user. When first called, it sends the message Message from yourname@yoursystem on yourttyname at time... The recipient of the message should write back at this point. Communication continues until an end of file is read from the terminal or an interrupt is sent. At that point write writes `EOT' on the other terminal and exits. If you want to write to a user who is logged in more than once, the ttyname argument may be used to indicate the appropriate terminal name. Permission to write may be denied or granted by use of the mesg command. At the outset writing is allowed. Certain commands, in particu- lar nroff and pr(1) disallow messages in order to prevent messy output. If the character `!' is found at the beginning of a line, write calls the shell to execute the rest of the line as a command. The following protocol is suggested for using write: when you first write to another user, wait for him to write back before starting to send. Each party should end each message with a distinctive signal--(o) for `over' is conventional--that the other may reply. (oo) for `over and out' is suggested when conversation is about to be terminated. FILES
/var/run/utmp to find user /bin/sh to execute `!' SEE ALSO
mesg(1), who(1), mail(1) 7th Edition November 27, 1996 WRITE(1)
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