simple printf question

[Bint]

Hi,

I have a giant string buffer, and I want to print out small chunks of it at
a time. How do I print out, say 20 characters of a string?

Is it like this?

printf("%20s",m ystring);

I can change the start point of the string, I just don't know how to tell it
to only print out X number of characters from it.
Thanks
B

[Richard Heathfield]

Re: simple printf question

Bint said:

Hi,
>
I have a giant string buffer, and I want to print out small chunks of it
at
a time. How do I print out, say 20 characters of a string?
>
Is it like this?
>
printf("%20s",m ystring);
>
I can change the start point of the string, I just don't know how to tell
it to only print out X number of characters from it.

printf("%.20s", mystring);

Note the dot in the format specifier.

Covered in K&R2 p244.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[Tor Rustad]

Re: simple printf question

Bint wrote:

Hi,
>
I have a giant string buffer, and I want to print out small chunks of it at
a time. How do I print out, say 20 characters of a string?
>
Is it like this?
>
printf("%20s",m ystring);

printf("%.*s", len, mystring);


--
Tor <torust [at] online [dot] no>

C-FAQ: http://c-faq.com/

[husterk]

Re: simple printf question

On Oct 17, 1:37 pm, "Bint" <b...@csgs.comw rote:

Hi,
>
I have a giant string buffer, and I want to print out small chunks of it at
a time. How do I print out, say 20 characters of a string?
>
Is it like this?
>
printf("%20s",m ystring);
>
I can change the start point of the string, I just don't know how to tell it
to only print out X number of characters from it.
Thanks
B

Bint,

Another more flexible method would be to snprintf() your larger string
into a temporary string buffer and then output the temporary buffer
using a standard unformatted printf(). This will allow you to
dynamically change the size of your output string by supplying a
variable length for your temporary string buffer in the snprintf()
routine (which cannot be accomplished using the "%.20s" method
described by Richard.

Keith

http://www.doubleblackdesign.com