how to measure size of an array

[asit dhal]

Can anyone tell how to measure the size of an array without use of
sizeof operator ?

[Ben Pfaff]

"asit dhal" <pe********@gma il.comwrites:

Can anyone tell how to measure the size of an array without use of
sizeof operator ?

How about referring to one of the many threads in the last few
months that discuss this same lame question, instead of starting
a new thread?
--
int main(void){char p[]="ABCDEFGHIJKLM NOPQRSTUVWXYZab cdefghijklmnopq rstuvwxyz.\
\n",*q="kl BIcNBFr.NKEzjwC IxNJC";int i=sizeof p/2;char *strchr();int putchar(\
);while(*q){i+= strchr(p,*q++)-p;if(i>=(int)si zeof p)i-=sizeof p-1;putchar(p[i]\
);}return 0;}

[lovecreatesbea...]

On Feb 14, 9:02 am, "asit dhal" <penasit...@gma il.comwrote:

Can anyone tell how to measure the size of an array without use of
sizeof operator ?

The size information is given at declaration of an array. When an
array is passed into a function, the sizeof can't evaluate the size of
the array inside the function.

[Jamie Boy]

asit dhal:

Can anyone tell how to measure the size of an array without use of
sizeof operator ?

(char*)pover - (char*)p

--
~/JB\~

[Keith Thompson]

"asit dhal" <pe********@gma il.comwrites:

Can anyone tell how to measure the size of an array without use of
sizeof operator ?

Use the sizeof operator. That's what it's for.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

[Joe Wright]

asit dhal wrote:

Can anyone tell how to measure the size of an array without use of
sizeof operator ?

No.

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---

[Richard Heathfield]

lovecreatesbea. [e-mail] said:

On Feb 14, 9:02 am, "asit dhal" <penasit...@gma il.comwrote:

>Can anyone tell how to measure the size of an array without use of
sizeof operator ?

The size information is given at declaration of an array. When an
array is passed into a function, the sizeof can't evaluate the size of
the array inside the function.

You don't pass an array to a function. You pass a pointer to that
array's first element.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at the above domain, - www.

[Malcolm McLean]

"Jamie Boy" <[e-mail] in message n

>Can anyone tell how to measure the size of an array without use of
sizeof operator ?

(char*)pover - (char*)p

Make that unsigned char *.
char * should be reserved for genuine character data, and can contain trap
representations . A highly unlikely but allowable implementation could even
crash your program if one of the pointers points to a trap representation.

--
~/JB\~

[Ben Pfaff]

"Malcolm McLean" <re*******@btin ternet.comwrite s:

"Jamie Boy" <[e-mail] in message n

>>Can anyone tell how to measure the size of an array without use of
sizeof operator ?

(char*)pover - (char*)p

Make that unsigned char *.
char * should be reserved for genuine character data, and can contain trap
representations . A highly unlikely but allowable implementation could even
crash your program if one of the pointers points to a trap representation.

I don't believe this. Can you cite chapter & verse on that?
--
int main(void){char p[]="ABCDEFGHIJKLM NOPQRSTUVWXYZab cdefghijklmnopq rstuvwxyz.\
\n",*q="kl BIcNBFr.NKEzjwC IxNJC";int i=sizeof p/2;char *strchr();int putchar(\
);while(*q){i+= strchr(p,*q++)-p;if(i>=(int)si zeof p)i-=sizeof p-1;putchar(p[i]\
);}return 0;}

[Flash Gordon]

Malcolm McLean wrote, On 14/02/07 22:50:

"Jamie Boy" <[e-mail] in message n

>>Can anyone tell how to measure the size of an array without use of
sizeof operator ?

(char*)pover - (char*)p

Make that unsigned char *.
char * should be reserved for genuine character data, and can contain trap
representations . A highly unlikely but allowable implementation could even
crash your program if one of the pointers points to a trap representation.

What the pointers point to is irrelevant since they are not dereferenced
so casting to char* is fine. The problem with it is how you determine
the correct value of pover before you know the size of the array.
--
Flash Gordon