float to unsigned char array

[C. Sengstock]

Hi,
i want to convert a floating point number to a character array, because I
want to save the number in an NVSRAM which can be described as:

unsigned char RAM[size];

Is there a C typical approach to convert the float number?

I used "fcvt()" to convert float to a string. But it seems its not part of
the standart language.

Thanks, Chris

[Thomas Pfaff]

"C. Sengstock" <c.*********@urz.uni-heidelberg.de> writes:

Hi,
i want to convert a floating point number to a character array,

See strtod() (C99 also defines strtof()).

[Thomas Pfaff]

Thomas Pfaff <th**********@tiscali.no> writes:

"C. Sengstock" <c.*********@urz.uni-heidelberg.de> writes:

Hi,
i want to convert a floating point number to a character array,

See strtod() (C99 also defines strtof()).

Sorry, but that doesn't quite do what you asked for. Sigh.

See sprintf or snprintf (C99).

[Martin Ambuhl]

C. Sengstock wrote:

Hi,
i want to convert a floating point number to a character array, because I
want to save the number in an NVSRAM which can be described as:

unsigned char RAM[size];

#include <stdio.h>
#include <float.h>
int main(void)
{
char s[BUFSIZ];
sprintf(s, "%.*g", DBL_DIG, 0.00000037);
printf("Here's one such string: %s\n", s);
sprintf(s, "%.*g", DBL_DIG, 0.00037);
printf(" here's another: %s\n", s);
sprintf(s, "%.*g", DBL_DIG, 0.37);
printf(" here's another: %s\n", s);
sprintf(s, "%.*g", DBL_DIG, 370.);
printf(" here's another: %s\n", s);
sprintf(s, "%.*g", DBL_DIG, 370000.);
printf(" here's another: %s\n", s);
sprintf(s, "%.*g", DBL_DIG, 370000000.);
printf(" here's another: %s\n", s);
sprintf(s, "%.*g", DBL_DIG, 370000000000.);
printf(" here's the last: %s\n", s);
return 0;
}
Here's one such string: 3.7e-07
here's another: 0.00037
here's another: 0.37
here's another: 370
here's another: 370000
here's another: 370000000
here's the last: 370000000000
--
Martin Ambuhl

[Martin Ambuhl]

Thomas Pfaff wrote:

"C. Sengstock" <c.*********@urz.uni-heidelberg.de> writes:

Hi,
i want to convert a floating point number to a character array,

See strtod() (C99 also defines strtof()).

Reread it, Tom. He wants to go the other way, for which sprintf() is the
choice.

--
Martin Ambuhl

[Emmanuel Delahaye]

In 'comp.lang.c', "C. Sengstock" <c.*********@urz.uni-heidelberg.de> wrote:

i want to convert a floating point number to a character array, because I
I assume you mean a 'string'.
want to save the number in an NVSRAM which can be described as:

unsigned char RAM[size];

Is there a C typical approach to convert the float number?

I used "fcvt()" to convert float to a string. But it seems its not part of
the standart language.

What's wrong with sprintf() (or snprintf() if you have C99). Time to reopen
your C-book...

--
-ed- em**********@noos.fr [remove YOURBRA before answering me]
The C-language FAQ: http://www.eskimo.com/~scs/C-faq/top.html
<blank line>
FAQ de f.c.l.c : http://www.isty-info.uvsq.fr/~rumeau/fclc/

[Jeff]

"C. Sengstock" <c.*********@urz.uni-heidelberg.de> wrote in message
news:bk**********@news.urz.uni-heidelberg.de...

Hi,
i want to convert a floating point number to a character array, because I
want to save the number in an NVSRAM which can be described as:

unsigned char RAM[size];

Is there a C typical approach to convert the float number?

Use sprintf( )

Make sure that your char buffer is big enough to hold the result. (If your
compiler support C99, you can use snprintf( ) to avoid buffer overflow)
--
Jeff
-je6543 at yahoo.com

[Kevin Easton]

C. Sengstock <c.*********@urz.uni-heidelberg.de> wrote:

Hi,
i want to convert a floating point number to a character array, because I
want to save the number in an NVSRAM which can be described as:

unsigned char RAM[size];

Is there a C typical approach to convert the float number?

I used "fcvt()" to convert float to a string. But it seems its not part of
the standart language.

You can just use memcpy(), as long as you're not moving your NVSRAM
between systems.

- Kevin.