a tricky if else(maybe not tricky but impossible)

[nirkheys]

Hi all,

I have been asked if the following is possible.
i googled for it,thought a lot about it and decided that it is
not possible,but i am posting it here in a hope of getting this
problem solved.

---------------------
if(x)
{
printf("Hello") ;
}
else
{
printf("world") ;
}Is there any value of x for which output would be Hello world?

-------------------------
Thanking you all in advance

Just Saurabh

[Richard Heathfield]

ni******@gmail. com said:

Hi all,

I have been asked if the following is possible.
i googled for it,thought a lot about it and decided that it is
not possible,but i am posting it here in a hope of getting this
problem solved.

---------------------
if(x)
{
printf("Hello") ;
}
else
{
printf("world") ;
}Is there any value of x for which output would be Hello world?

Yes.

#define x printf("Hello ") == 42
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)

[Vladimir Oka]

ni******@gmail. com wrote:

Hi all,

I have been asked if the following is possible.
i googled for it,thought a lot about it and decided that it is
not possible,but i am posting it here in a hope of getting this
problem solved.

---------------------
if(x)
{
printf("Hello") ;
}
else
{
printf("world") ;
}Is there any value of x for which output would be Hello world?

No.

OTH, if somewhere you don't terminate output with '\n' or flush it, you
may see nothing at all.

[arun]

If x can be anything ??
Give a printf statement which prints "hello" in the place of x.
And negate the whole thing. Put it as --> if ( !x ).
The printf will return 5 and the negation will make the condition fail
and the printf in the else part will work. It will print "hello world".

Regards,
arun..

[Zero]

ni******@gmail. com schrieb:

Hi all,

I have been asked if the following is possible.
i googled for it,thought a lot about it and decided that it is
not possible,but i am posting it here in a hope of getting this
problem solved.

---------------------
if(x)
{
printf("Hello") ;
}
else
{
printf("world") ;
}Is there any value of x for which output would be Hello world?

-------------------------
Thanking you all in advance

Just Saurabh

Perhaps you don't understand if/else...
it's just either .. or and not both :-)

[nirkheys]

arun wrote:

If x can be anything ??
Give a printf statement which prints "hello" in the place of x.
And negate the whole thing. Put it as --> if ( !x ).
The printf will return 5 and the negation will make the condition fail
and the printf in the else part will work. It will print "hello world".

Regards,
arun..

Thanks a lot Arun.
You solved my problem.
Just Saurabh

[nirkheys]

arun wrote:

If x can be anything ??
Give a printf statement which prints "hello" in the place of x.
And negate the whole thing. Put it as --> if ( !x ).
The printf will return 5 and the negation will make the condition fail
and the printf in the else part will work. It will print "hello world".

Regards,
arun..

Thanks a lot Arun.
You solved my problem.
Just Saurabh

[Martin Ambuhl]

ni******@gmail. com wrote:

Hi all,

I have been asked if the following is possible.
i googled for it,thought a lot about it and decided that it is
not possible,but i am posting it here in a hope of getting this
problem solved.

---------------------
if(x)
{
printf("Hello") ;
}
else
{
printf("world") ;
}Is there any value of x for which output would be Hello world?

#include <stdio.h>
#define x (printf("Hello "),fflush(stdou t),0)

int main(void)
{
printf("[output:]\n");
if (x)
printf("Hello") ;
else
printf("world") ;
putchar('\n');
return 0;
}

[output:]
Hello world

[Ben C]

On 2006-04-25, ni******@gmail. com <ni******@gmail .com> wrote:

Hi all,

I have been asked if the following is possible.
i googled for it,thought a lot about it and decided that it is
not possible,but i am posting it here in a hope of getting this
problem solved.

---------------------
if(x)
{
printf("Hello") ;
}
else
{
printf("world") ;
}Is there any value of x for which output would be Hello world?

Here's one:

#include <stdio.h>

int y = 1;
#define x (y-- ? main() : 1)

int main(void)
{
if (x)
printf("Hello\n ");
else
printf("World\n ");

return 0;
}

[CBFalconer]

Richard Heathfield wrote:

ni******@gmail. com said:

I have been asked if the following is possible.
i googled for it,thought a lot about it and decided that it is
not possible,but i am posting it here in a hope of getting this
problem solved.

---------------------
if(x)
{
printf("Hello") ;
}
else
{
printf("world") ;
}Is there any value of x for which output would be Hello world?

Yes.

#define x printf("Hello ") == 42

A nice devious mind at work :-)

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