[C] copy string question

[Alan]

hi, i want to separate a string into different parts and copy them to other
array, how can i do that?

Char s[11] = "12345.6789 ";
Char long_d[4] = "000",
long_m[8] = "00.0000";

e.g. i want to copy s to long_d and long_m so that
long_d[4] = "123" and long_m[8] = "45.6789"

thx

[Artie Gold]

Re: [C] copy string question

Alan wrote:[color=blue]
> hi, i want to separate a string into different parts and copy them to other
> array, how can i do that?
>
> Char s[11] = "12345.6789 ";[/color]
Erm, that's `char', not `Char'.[color=blue]
> Char long_d[4] = "000",[/color]
Similarly.[color=blue]
> long_m[8] = "00.0000";
>
> e.g. i want to copy s to long_d and long_m so that
> long_d[4] = "123" and long_m[8] = "45.6789"
>[/color]

Use strncpy().

HTH,
--ag

--
Artie Gold -- Austin, Texas

"Yeah. It's an urban legend. But it's a *great* urban legend!"

[Alan]

Re: [C] copy string question



"Artie Gold" wrote:[color=blue]
> Alan wrote:[color=green]
> > hi, i want to separate a string into different parts and copy them to[/color][/color]
other[color=blue][color=green]
> > array, how can i do that?
> >
> > Char s[11] = "12345.6789 ";[/color]
> Erm, that's `char', not `Char'.[color=green]
> > Char long_d[4] = "000",[/color]
> Similarly.[color=green]
> > long_m[8] = "00.0000";
> >
> > e.g. i want to copy s to long_d and long_m so that
> > long_d[4] = "123" and long_m[8] = "45.6789"
> >[/color]
>
> Use strncpy().[/color]

but when i use
strncpy(long_d, s,3);
strncpy(long_m, s,7);
i just got long_d[4] = "123" and long_m[8] = "12345.6"

[color=blue]
>
> HTH,
> --ag
>
> --
> Artie Gold -- Austin, Texas
>
> "Yeah. It's an urban legend. But it's a *great* urban legend!"[/color]

[Jeff Schwab]

Re: [C] copy string question

Alan wrote:[color=blue]
> "Artie Gold" wrote:
>[color=green]
>>Alan wrote:
>>[color=darkred]
>>>hi, i want to separate a string into different parts and copy them to[/color][/color]
>
> other
>[color=green][color=darkred]
>>>array, how can i do that?
>>>
>>>Char s[11] = "12345.6789 ";[/color]
>>
>>Erm, that's `char', not `Char'.
>>[color=darkred]
>>>Char long_d[4] = "000",[/color]
>>
>>Similarly.
>>[color=darkred]
>>> long_m[8] = "00.0000";
>>>
>>>e.g. i want to copy s to long_d and long_m so that
>>>long_d[4] = "123" and long_m[8] = "45.6789"
>>>[/color]
>>
>>Use strncpy().[/color]
>
>
> but when i use
> strncpy(long_d, s,3);
> strncpy(long_m, s,7);
> i just got long_d[4] = "123" and long_m[8] = "12345.6"[/color]

You can always ignore any number of characters at the beginning of the
string (up to the length of the string), and still have a valid string.
In this case, you want to skip the first three:

strncpy( long_m, s + 3, 7 );

Since the string you want is indicated by the address of the fourth
element (which has index 3), you could also do it this way:

strncpy( long_m, &s[3], 7 );