invalid lvalue

invalid lvalue

[Mohammed Khalid Ansari]

I tried to compile the following program...

int main()
{
	int a;
	
	a = 2;
#	printf ("%d\n", a++++);
	
	return 0;
}

but it gave the following error.

"invalid lvalue in increment" for the line indicated by #. Why it so, a 
has been defined as an int variable!

-- 

**************************************************************************

Mohammed Khalid Ansari                    Tel (res) : 0091-022-3051360
Assistant Manager II                          (off) : 0091-022-2024641
National Centre for Software Technology   Fax       : 0091-022-2049573 
8th flr,Air India Build. Nariman Point,   E-Mail    : khalid@ncst.ernet.in 	
Mumbai 400021.

Homepage : http://soochak.ncst.ernet.in/~khalid			  	  

**************************************************************************

Re: invalid lvalue

[Jan-Benedict Glaw]

[-- Attachment #1: Type: text/plain, Size: 1026 bytes --]

On Sat, 2003-02-15 20:57:35 +0530, Mohammed Khalid Ansari <khalid@ncst.ernet.in>
wrote in message <Pine.LNX.4.33.0302152054580.24802-100000@soochak.ncst.ernet.in>:
> 
> I tried to compile the following program...
> 
> int main()
> {
> 	int a;
> 	a = 2;
> #	printf ("%d\n", a++++);
> 	return 0;
> }

> "invalid lvalue in increment" for the line indicated by #. Why it so, a 
> has been defined as an int variable!

Well, the compiler seemed to read this as (a++)++ .  The braces are
evaluated (this results in a _number), and then you try to increment
this number. But this doesn't work, because "++" is ment for variables,
not for numbers.

Use 'printf ("%d\n", a += 2);' instead (if it was your intend to add two
to a).

MfG, JBG

-- 
   Jan-Benedict Glaw       jbglaw@lug-owl.de    . +49-172-7608481
   "Eine Freie Meinung in  einem Freien Kopf    | Gegen Zensur
    fuer einen Freien Staat voll Freier Bürger" | im Internet!
   Shell Script APT-Proxy: http://lug-owl.de/~jbglaw/software/ap2/

[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]