Как sprintf() работает с float числами? Опции

[Александар]

Q правильно преобразуется, а E не понятно как.
в прикрепленном файле содержимое массива Str после выполнения функции.

#include <avr/io.h>
#include <stdio.h>

unsigned char Q=5;
char Str[16];
double E=2.15;
int main(void) //
{

sprintf(Str, "Q=%d E=%2.2f %s",Q, E, "FFF");
__asm__ volatile("nop");

}

Эскизы прикрепленных изображений

 

[aesok]

RTFM:

Since the full implementation of all the mentioned features becomes fairly large, three different flavours of vfprintf() can be selected using linker options. The default vfprintf() implements all the mentioned functionality except floating point conversions. A minimized version of vfprintf() is available that only implements the very basic integer and string conversion facilities, but only the # additional option can be specified using conversion flags (these flags are parsed correctly from the format specification, but then simply ignored). This version can be requested using the following compiler options:


-Wl,-u,vfprintf -lprintf_min

If the full functionality including the floating point conversions is required, the following options should be used:


-Wl,-u,vfprintf -lprintf_flt -lm

Анатолий

Сообщение отредактировал aesok - Apr 28 2008, 10:06