mingw - Conversion specifier of long double in C -

the long double data type can have these conversion specifiers in c: %le,%le,%lf,%lg,%lg (reference).

i wrote small program test :

#include <stdio.h> int main(void) {   long double d = 656546.67894l;   printf("%.0le\n",d);   printf("%.0le\n",d);   printf("%.0lf\n",d);   printf("%.0lg\n",d);   printf("%.0lg\n",d);   return 0;  } 

output:

-0

-4e-153

-0

-4e-153

-4e-153

but none giving desired output, 656547 (as may understand). reason?

the compiler used gcc version 3.4.2 (mingw-special).

from old mingw wiki:

mingw uses microsoft c run-time libraries , implementation of printf not support 'long double' type. work-around, cast 'double' , pass printf instead. example:

printf("value = %g\n", (double) my_long_double_value); 

note similar problem exists 'long long' type. use 'i64' (eye sixty-four) length modifier instead of gcc's 'll' (ell ell). example:

printf("value = %i64d\n", my_long_long_value); 

edit (6 years later): see comment below keith thompson workaround:

#define __use_mingw_ansi_stdio 1 in source file or change command line gcc -d__use_mingw_ansi_stdio=1