Norbert Unterberg schrieb:
Hi,
we are using arm-none-eabi-gcc (Sourcery G++ Lite 2009q3-68) 4.4.1.
Formatting a floating point number with sprintf does not seem to work:
char b[20];
float temperature = 0.4f;
sprintf(b, "%6.1f ", temperature);
prints " -0.0" into the buffer.
I have searched the mailing list and have found an article from
September 9 ("output of sprintf with double-input"), but I did not
understand the solution posted there.
My "solution" there only fixed the little hello world problem.I had no time to find out what exactly happened and it would be nice if someone could explain in more detail.
At that time I only saw that the problem was not located on sprintf in particular, but on variadic functions. As a test I used the average function of http://en.wikipedia.org/wiki/Variadic_function -> function va_arg (ap, double) always returns 0.
Regards, Klaus