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Subject: [Bug libfortran/48651] DTOA float conversion issue
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48651

--- Comment #3 from Thomas Henlich <thenlich at users dot sourceforge.net> 2011-04-17 18:34:15 UTC ---
(In reply to comment #2)
> hmm, notice the typo! i have set ldnum to 0.0 but it still is printing the
> value of dnum. What am I doing wrong.
> 
> $ cat sprint.c 
> #include <stdio.h>
> 
> int
> main ()
> {
>   float num = 0.9;
>   double dnum = 0.9;
>   long double ldnum = 25.6;
>   printf("%50.48f\n", num);
>   printf("%50.48lf, %d\n", num, sizeof(num));
>   printf("%80.78f\n", dnum);
>   printf("%80.78lf, %d\n", dnum, sizeof(dnum));
>   printf("%80.78f\n", ldnum);
>   printf("%80.78lf, %d\n", ldnum, sizeof(ldnum));

Check your format strings, use "lf" only for long double.