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How to ftoa ?

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Bart

Joined: 12 Jul 2005
Posts: 49

How to ftoa ?

Posted: Thu Sep 15, 2005 4:23 pm

Hello,

I need to convert a float back to an char array.

I tryed this

Code:

fprintf(MODEM,"SPEED field in buffer : %S knots ",temp_buffer);
temp_buffer = (atof(temp_buffer) * 1.852) + '0';
temp_buffer[8] = 0;
fprintf(MODEM,"( %3.3f km/uur)\n\r",temp_buffer);

but this won't compile.
The

Code:

atof(temp_buffer) * 1.852

is giving something in the form
x.xxxxxxxx
xx.xxxxxxx
xxx.xxxxxx
(no more than 3 before the dot, don't need more than 3 after the dot)

Can someone correct my code ?
Thanks for the great help.

PS : Can't use other/additional variables due to RAM limitations.
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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Sep 15, 2005 5:50 pm

Quote:

I need to convert a float back to an char array.

The output of the following test program is: 1.23

Code:

#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//======================================
main(void)
{
float f;
char buffer[20];

f = 1.234;

sprintf(buffer, "%4.2f", f);

printf("%s", buffer);

while(1);
}

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