Getting Integer from String?

[jobo]

Hello,

If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.

[Chris McDonald]

"jobo" <jo*****@gmail.comwrites:

>If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.

Sounds like homework, but
If char *str = "free 123";
then the address of the '1' will be str+5, or &str[5] .

--
Chris.

[mark_bluemel]

jobo wrote:

Hello,

If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.

Is there always a space between "free" and the integer?

Do you know for certain that there will be no characters after the
integer?

If so, then if the string is provided as a char * called (e.g.) "str"
then the integer (as a string) will be at str+5 and you could use one
of the standard functions (from the manual) to convert it to an integer
or long datatype.

There are other approaches, for example there is a function (also in
the manual) for scanning strings and extracting data from them. Or you
could write a routine that searches through the string till it find the
first digit, and then continues, multiplying a running total by 10 (I
presume the integer is in decimal representation) and adding the value
of the next digit, till you run out of digits.

[Andrew Poelstra]

On Mon, 2006-11-06 at 22:08 -0800, jobo wrote:

Hello,

If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.

scanf("free %d", &n);

Any good C textbook should tell you that.

--
Andrew Poelstra <http://www.wpsoftware.net>
For email, use 'apoelstra' at the above site.
"You're only smart on the outside." -anon.

[mark_bluemel]

Andrew Poelstra wrote:

On Mon, 2006-11-06 at 22:08 -0800, jobo wrote:

Hello,

If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.

scanf("free %d", &n);

Actually for a string, he needs sscanf() surely...

[Andrew Poelstra]

On Tue, 2006-11-07 at 07:29 -0800, ma**********@pobox.com wrote:

Andrew Poelstra wrote:

On Mon, 2006-11-06 at 22:08 -0800, jobo wrote:

Hello,
>
If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.
>

scanf("free %d", &n);

Actually for a string, he needs sscanf() surely...

I misread being "given" a string as input from stdin. My bad.

--
Andrew Poelstra <http://www.wpsoftware.net>
For email, use 'apoelstra' at the above site.
"You're only smart on the outside." -anon.

[Peter Karlsson]

On 2006-11-07, jobo <jo*****@gmail.comwrote:

Hello,

If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.

strtol?

//Peter

[Xavier Serrand]

long int convert (char * s, char *endptr, int base)
{
return strtol (s+3, &endptr, base);
}

"Peter Karlsson" <[e-mail] écrit dans le message de news:
eo**********@news.al.sw.ericsson.se...

On 2006-11-07, jobo <jo*****@gmail.comwrote:

Hello,

If I'm given a string that always starts with the word "free" followed
by an integer ("free xx"). How do I parse through the characters and
get to the integer value? Thanks.

strtol?

//Peter

[CBFalconer]

Peter Karlsson wrote:

On 2006-11-07, jobo <jo*****@gmail.comwrote:

>>
If I'm given a string that always starts with the word "free"
followed by an integer ("free xx"). How do I parse through the
characters and get to the integer value? Thanks.

strtol?

There are few things stupider than an erroneous response to a two
months old query.

--
"A man who is right every time is not likely to do very much."
-- Francis Crick, co-discover of DNA
"There is nothing more amazing than stupidity in action."
-- Thomas Matthews