UCHAR_MIN & UCHAR_MAX

[Carramba]

hi!

how do I call UCHAR_MIN & UCHAR_MAX ?
printf("unsigned-char: [%c, %c]\n", UCHAR_MIN, UCHAR_MAX);
Iam getting error with %c? with one I should use? and why?

thax in advance

 

[Emmanuel Delahaye]

Carramba wrote on 30/01/05 :

how do I call UCHAR_MIN & UCHAR_MAX ?
printf("unsigned-char: [%c, %c]\n", UCHAR_MIN, UCHAR_MAX);
Iam getting error with %c? with one I should use? and why?

What error ?

First of all, try with "%d" to see the values (in decimal).

BTW, I guess you included <limits.h>

--
Emmanuel
The C-FAQ: http://www.eskimo.com/~scs/C-faq/faq.html
The C-library: http://www.dinkumware.com/refxc.html

"C is a sharp tool"

 

[Carramba]

yes,

the problem was there isn't UCHAR_MIN .... only MAX ...

thanx

Carramba wrote on 30/01/05 :

how do I call UCHAR_MIN & UCHAR_MAX ?
printf("unsigned-char: [%c, %c]\n", UCHAR_MIN, UCHAR_MAX);
Iam getting error with %c? with one I should use? and why?

What error ?

First of all, try with "%d" to see the values (in decimal).

BTW, I guess you included <limits.h>

 

[S.Tobias]

how do I call UCHAR_MIN & UCHAR_MAX ?

^^^^^^^^^
What this? -------^

printf("unsigned-char: [%c, %c]\n", UCHAR_MIN, UCHAR_MAX);
Iam getting error with %c? with one I should use? and why?

What's the error message?

 

[CBFalconer]

how do I call UCHAR_MIN & UCHAR_MAX ?
printf("unsigned-char: [%c, %c]\n", UCHAR_MIN, UCHAR_MAX);
Iam getting error with %c? with one I should use? and why?

First you need to #include <limits.h>. Then you need to use %d,
since those macros describe the limits of the type, and those
limits are not necessarily printable. Third, there is no
UCHAR_MIN, it is zero, as for all unsigned types.

 

[Emmanuel Delahaye]

Carramba wrote on 30/01/05 :

yes,

the problem was there isn't UCHAR_MIN .... only MAX ...

thanx

Carramba wrote on 30/01/05 :

how do I call UCHAR_MIN & UCHAR_MAX ?
printf("unsigned-char: [%c, %c]\n", UCHAR_MIN, UCHAR_MAX);
Iam getting error with %c? with one I should use? and why?

What error ?

First of all, try with "%d" to see the values (in decimal).

BTW, I guess you included <limits.h>

After brain shaking...

UCHAR_MIN doesn't exist. It's 0 by definition.

BTW, the correct formatter is "%u".

printf("unsigned-char: [%c, %c]\n", 0, UCHAR_MAX);

--
Emmanuel
The C-FAQ: http://www.eskimo.com/~scs/C-faq/faq.html
The C-library: http://www.dinkumware.com/refxc.html

"Mal nommer les choses c'est ajouter du malheur au
monde." -- Albert Camus.

 

[S.Tobias]

BTW, the correct formatter is "%u".

printf("unsigned-char: [%c, %c]\n", 0, UCHAR_MAX);

Didn't you mean to write:
printf("unsigned-char: [%u, %u]\n", 0, UCHAR_MAX);
?

UCHAR_MAX constant is promoted to either singed or unsigned int.
Since the value is positive, either result must have the same
representation. The difference is only in the type. Is a cast
before the constants recommended or not in this case?

 

[S.Tobias]

UCHAR_MAX constant is promoted to either singed or unsigned int.

XXXXXXXXXXXXXX
UCHAR_MAX _is_ either singed or unsigned int (depending on the result
of the promotion of unsigned char - cf. 5.2.4.2.1).

 

[Emmanuel Delahaye]

S.Tobias wrote on 31/01/05 :

BTW, the correct formatter is "%u".

printf("unsigned-char: [%c, %c]\n", 0, UCHAR_MAX);

Didn't you mean to write:
printf("unsigned-char: [%u, %u]\n", 0, UCHAR_MAX);
?

Sure!

--
Emmanuel
The C-FAQ: http://www.eskimo.com/~scs/C-faq/faq.html
The C-library: http://www.dinkumware.com/refxc.html

"Mal nommer les choses c'est ajouter du malheur au
monde." -- Albert Camus.

 

[Peter Nilsson]

S.Tobias wrote on 31/01/05 :

BTW, the correct formatter is "%u".

printf("unsigned-char: [%c, %c]\n", 0, UCHAR_MAX);

Didn't you mean to write:
printf("unsigned-char: [%u, %u]\n", 0, UCHAR_MAX);
?

Sure!

%u expects an unsigned int, not an int. The wording of the
standard doesn't guarantee that %u will work in this case
(although that _was_ the intent of the committee.)

That said, it is arguable whether a hosted implementation
can be considered conforming if UCHAR_MAX promotes to
unsigned int, so I think that...

printf("unsigned-char: [%d..%d]\n", 0, UCHAR_MAX);

....is safer. If you're truly paranoid, then use...
printf("unsigned-char: [%u..%u]\n", 0u, 0u + UCHAR_MAX);