manipulate string

[crovax75@hotmail.com]

LS,

I've a problem to get the year, month and day from the following
string: "20051027"

--

#include <stdio.h>
#include <string.h>

char str[9]="20051027";

char year[5], month[3], day[3];




int main(void){

printf("String str: %s\n",str);


strncpy(year, str, 4);
year[4] = '\0';
printf("%s\n", year);


//But how to get the month in the string 'str'?


printf("Year:%s \n",year);
printf("Month:% s\n",month);
printf("Day:%s\ n",day);

getchar();
return 0;
}

--

PS. It is not a problem to concert it to integers.

Greetz,

Marcel

[Christopher Benson-Manica]

Re: manipulate string

crovax75@hotmai l.com wrote:
[color=blue]
> #include <stdio.h>
> #include <string.h>[/color]
[color=blue]
> char str[9]="20051027";[/color]
[color=blue]
> char year[5], month[3], day[3];[/color]
[color=blue]
> int main(void){[/color]
[color=blue]
> strncpy(year, str, 4);[/color]

If you're feeling adventurous, you could use sscanf() for this task.
The following is easier, though...

sprintf( year, "%.4s", str );
sprintf( month, "%.2s", str+4 );
sprintf( day, "%.2s", str+6 );

assuming, of course, that you have somehow verified that str is in the
format you expect.
[color=blue]
> year[4] = '\0';
> printf("%s\n", year);[/color]

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cybers pace.org | don't, I need to know. Flames welcome.

[Jirka Klaue]

Re: manipulate string

Christopher Benson-Manica:[color=blue]
> crovax75@hotmai l.com:
>[color=green]
>> char str[9]="20051027";[/color][/color]
....[color=blue]
> If you're feeling adventurous, you could use sscanf() for this task.[/color]

IMO sscanf is *the* tool for this task.

unsigned y, m, d; /* if you insist on strings, do the obvious */

if (3 == sscanf(str, "%4u%2u%2u" , &y, &m, &d))
printf("%u %u %u\n", y, m, d);
[color=blue]
> The following is easier, though...
>
> sprintf( year, "%.4s", str );
> sprintf( month, "%.2s", str+4 );
> sprintf( day, "%.2s", str+6 );[/color]

Well, longer. More error-prone. But easier?
[color=blue]
> assuming, of course, that you have somehow verified that str is in the
> format you expect.[/color]

OK, sscanf can do this for you.

Jirka

[Gow]

Re: manipulate string

Christopher Benson-Manica wrote:[color=blue]
> crovax75@hotmai l.com wrote:
>[color=green]
> > #include <stdio.h>
> > #include <string.h>[/color]
>[color=green]
> > char str[9]="20051027";[/color]
>[color=green]
> > char year[5], month[3], day[3];[/color]
>[color=green]
> > int main(void){[/color]
>[color=green]
> > strncpy(year, str, 4);[/color]
>
> If you're feeling adventurous, you could use sscanf() for this task.
> The following is easier, though...
>
> sprintf( year, "%.4s", str );
> sprintf( month, "%.2s", str+4 );
> sprintf( day, "%.2s", str+6 );
>
> assuming, of course, that you have somehow verified that str is in the
> format you expect.
>[color=green]
> > year[4] = '\0';
> > printf("%s\n", year);[/color]
>
> --
> Christopher Benson-Manica | I *should* know what I'm talking about - if I
> ataru(at)cybers pace.org | don't, I need to know. Flames welcome.[/color]


Or if you want to have the same approach you can do it as below.

#include <stdio.h>
#include <string.h>

char str[9]="20051027";

char year[5], month[3], day[3];

int main(void){

printf("String str: %s\n",str);

strncpy(year, str, 4);
year[4] = '\0';
printf("%s\n", year);

strncpy(month,& str[4],2);
month[3]='\0';
printf("%s\n", month);

strncpy(day,&st r[6],2);
day[3]='\0';
printf("%s\n", day);

}

[Christopher Benson-Manica]

Re: manipulate string

Jirka Klaue <jklaue@tkn.t u-berlin.de> wrote:
[color=blue]
> Well, longer. More error-prone. But easier?[/color]

It's less tricky to do correctly than *scanf(), at least as has been
shown by some recent posts.

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cybers pace.org | don't, I need to know. Flames welcome.

[crovax75@hotmail.com]

Re: manipulate string


Christopher Benson-Manica wrote:[color=blue]
> Jirka Klaue <jklaue@tkn.t u-berlin.de> wrote:
>[color=green]
> > Well, longer. More error-prone. But easier?[/color]
>
> It's less tricky to do correctly than *scanf(), at least as has been
> shown by some recent posts.
>
> --
> Christopher Benson-Manica | I *should* know what I'm talking about - if I
> ataru(at)cybers pace.org | don't, I need to know. Flames welcome.[/color]

Hi all,

It works well with:

sprintf( year, "%.4s", str );
sprintf( month, "%.2s", str+4 );
sprintf( day, "%.2s", str+6 );

I want to thanks all of you for the fast replies!

Marcel

[Dave Thompson]

Re: manipulate string

On 27 Oct 2005 08:35:46 -0700, "Gow" <gowdish@gmail. com> wrote:
<snip>[color=blue]
> char str[9]="20051027";
>
> char year[5], month[3], day[3];
>
> int main(void){
>
> printf("String str: %s\n",str);
>
> strncpy(year, str, 4);
> year[4] = '\0';
> printf("%s\n", year);
>
> strncpy(month,& str[4],2);
> month[3]='\0';
> printf("%s\n", month);
>
> strncpy(day,&st r[6],2);
> day[3]='\0';
> printf("%s\n", day);
>[/color]
Nit: month[2] and day[2].
[color=blue]
> }[/color]

- David.Thompson1 at worldnet.att.ne t