// a.c
#include <stdio.h>
int main(void)
{
    printf("%a\n", 1.0);
    return 0;
}

when compiled without -D__USE_MINGW_ANSI_STDIO=1, got 0x1.000000p+0
(in windows 7)
when compiled with -D__USE_MINGW_ANSI_STDIO=1, got 0x0p-63

also, the compiler doesn't use the mingw stdio despite -std=c99

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