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From: burris@ihuxz.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: sizeof("string")
Message-ID: <2006@ihuxz.ATT.COM>
Date: Mon, 13-Apr-87 22:40:24 EST
Article-I.D.: ihuxz.2006
Posted: Mon Apr 13 22:40:24 1987
Date-Received: Wed, 15-Apr-87 04:39:53 EST
References: <8704120143.AA11235@cory.Berkeley.EDU>
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 48
Summary: Wrong! sizeof("string")

In article <8704120143.AA11235@cory.Berkeley.EDU>, dillon@CORY.BERKELEY.EDU (Matt Dillon) writes:
> >>In doing this I have found two (more!) bugs in Megamax:-
> >>
> >>  sizeof("anystring") returns 4 (the size of the pointer!!!!), not 10.
> >
> >Excuse me, but this doesn't sound like a bug...  If you take a look at
> 
> 	Wrong, it should be 10.  Remember that sizeof() is special when it
> comes to arrays.  sizeof() always returns the effective storage.
> 
> 	char array[32];
> 	char *ptr;
> 
> 	sizeof(array)		-result had better be 32
> 
> 	The same goes for strings...
> 
> 	sizeof("hello")		-result had better be 6 (it includes the \0)
> 
> 	But pointers, on the other hand...
> 
> 	sizeof(ptr)		-result is 4
> 
> 
> 			-Matt


The first response was correct. That's why there's a strlen() function.
Now if it were as follows:

char	string[ 20 ];
char	*strpt = "hello";

main()
{
	printf( "%d\n", sizeof( string ) );
	printf( "%d\n", sizeof( strpt ) );
	printf( "%d\n", sizeof( "hello" ) );
}

the result would be:

20
4
4

Dave Burris
ihnp4!ihuxz!burris