topic Can not use the function „strtod“ in MQX Software Solutions

Can not use the function „strtod“

soli — Fri, 01 Jun 2012 17:07:27 GMT

Hello,

I have to translate numbers from string to double. Therefor I would like to use the function “strtod(char *x, char **y)”

I test this with following code:

double result = 0;

char *sub_str_end = NULL;

char test[] = "1.234";

//! Test 1

result = strtod(test, NULL);

//! Test 1

sub_str_end = test+4;

result = strtod(test, &sub_str_end);

if (errno != 0)

printf("ERRNO\n");

But if I use this code, I get the number “-927712936.000000” for result.

Does anyone has an idea why this not work? (Are there missing compiler settings?)

Thanks.

c0170 — Tue, 05 Jun 2012 13:53:36 GMT

Hello soli,

your program uses compilers strtod, you haven't specified which one, if it was for CW,IAR or KEIL.

Anyway, MQX provides its function called _io_strtod which is located in a file io_fp.c in the directory source/fio.

Try _io_strtod and share with us if it works for your case.

Regards,

MartinK

soli — Fri, 08 Jun 2012 16:58:41 GMT

Thank you Kojto,

_io_strtod is working well. (I use CW)

But I do not understand why the normal strtod does not work? Because it is a normal standard function in C.