is it possible?

please forgive me if it is a stupid question because i dont
understand
I saw a question in C -

if (____)
printf("welcome");
else
printf("to C world");

what should be the condition in if(___) for following output

welcome to C world

re: is it possible?

On Sep 1, 9:27 am, Tinku <sumit15...@gmail.comwrote:printf("welcome "), 0

re: is it possible?

Tinku wrote:
Here's one solution. Note the '\n' needed at the end of the last line
of output.

#include <stdio.h>

int main(void)
{
if (printf("welcome "), 0)
printf("welcome");
else
printf("to C world");
putchar('\n'); /* needed to be sure that there _is_
any output */
return 0;
}

[output]
welcome to C world

re: is it possible?

Tinku wrote:#define ____ (printf("welcome ") && 0)


August

re: is it possible?

Hi

On Sun, 31 Aug 2008 23:27:48 -0700, Tinku wrote:
You have had several answers, all correct, but none very useful, as is to
be expected in comp.lang.c.

In answer to your question, it is not possible make both the if and the
else happen, without using goto or something like that, which can get
confusing.

The answers from vippstar, Martin & August use a comma operator to make
the evaluation of the ___ have a side effect of printing "welcome ", and
then evaluate as false, causing "to C world" to be printed.

Remember that when joining strings together, you usually need to give one
of them a space character where they meet.

HTH
viza

re: is it possible?

On Sep 1, 1:45 pm, August Karlstrom <fusionf...@gmail.comwrote:Identifiers starting with two underscores are reserved for the
implementation, your code invokes undefined behavior.

re: is it possible?

On Sep 1, 1:58 pm, viza <tom.v...@gm-il.com.obviouschange.invalid>
wrote:s/in comp.lang.c/with such vague specification.
August did not use the comma operator.
Why?

re: is it possible?

viza wrote:I think you've made the mistake of interpreting this as a serious
question. It's just a trick question, with a trick solution. "Useful"
wasn't the issue.

re: is it possible?

vippstar@gmail.com said:
<snip>
#include <stdio.h>

#define foo "this" "is" "why"

int main(void)
{
puts(foo);
return 0;
}

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

re: is it possible?

viza <tom.viza@gm-il.com.obviouschange.invalidwrites:No useful answer is possible.
The problem statement didn't ask for a way to make both the if and the
else happen; it asked for a way to make the program produce the output
"welcome to C world". The printf("welcome") call was a deliberate red
herring.

[...]

A sufficiently good and clever C programmer should be able to solve
the problem as stated. Note that "good" and "clever" are not
synonymous. A sufficiently clever programmer might use such a trick
in production code; a good programmer never will.

--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

re: is it possible?

On 1 Sep, 07:27, Tinku <sumit15...@gmail.comwrote:--
Nick Keighley