Truncate a string using printf

[Alessio]

Hi,


there's a way to truncate a string using printf ?
For example, I've a string that is 50 chars long and I want to output to
video only first 20 chars.
How ?

Alessio.

 

[Noob]

there's a way to truncate a string using printf ?
For example, I've a string that is 50 chars long and I want to output to
video only first 20 chars.
How ?

Have you tried the following?
buf[21] = 0;

 

[Hallvard B Furuseth]

I've a string that is 50 chars long and I want to output to
video only first 20 chars.

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

 

[bartc]

Hi,


there's a way to truncate a string using printf ?
For example, I've a string that is 50 chars long and I want to output to
video only first 20 chars.
How ?

Try a format string such as "%.20s"

 

[Ben Bacarisse]

there's a way to truncate a string using printf ?
For example, I've a string that is 50 chars long and I want to output
to video only first 20 chars.
How ?

Look at whatever documentation you have for printf. See what you can
have in a %s format specifier other than just the % and the s. One of
these things will give you the answer!

I am being cryptic, in part, because this is the season of coursework,
but also because it is really true that you will learn so much more by
finding the answer yourself.

 

[Alessio]

Noob ha scritto:

Have you tried the following?
buf[21] = 0;

No, because I want to use printf.
No, because I want string to be 20 and not 21 chars len.
No, because using that, I must to check if string len is more than 21 chars.

Alessio.

 

[Alessio]

Hallvard B Furuseth ha scritto:

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

thank you.

 

[Alessio]

bartc ha scritto:

Try a format string such as "%.20s"

thank you.

 

[Alessio]

Ben Bacarisse ha scritto:

Look at whatever documentation you have for printf. See what you can
have in a %s format specifier other than just the % and the s. One of
these things will give you the answer!

I am being cryptic, in part, because this is the season of coursework,
but also because it is really true that you will learn so much more by
finding the answer yourself.

Thank you.
I assure you that I ALWAYS check documentation\google.
But today is different, I was too lazy!

Sorry,
Alessio.

 

[Eric Sosman]

Hi,


there's a way to truncate a string using printf ?
For example, I've a string that is 50 chars long and I want to output to
video only first 20 chars.

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

("%20.20s" and "%-20.20s" may also merit consideration.)