You could just do:
fflush (stdout); /* clear the stream buffer */
write (1, myvar, 4); /* write binary to stdout */
jim
> Thanks. This is exactly what I want. I have thought about doing it this
> way, it is just that from memory, there is a libc function that does the
> equivalent.
>
> shao.
>
> Matthew Dalton [EMAIL PROTECTED] wrote:
> > Sorry... I automatically made a link between binary data and hexadecimal
> > data...
> >
> > You could shift 8 bits of the unsigned long into a unsigned char one at
> > a time, and print that character with a %c in the printf, or use
> > putchar() or something.
> >
> > eg:
> > unsigned long l = 0x38c9616e;
> > unsigned char c;
> > :
> > :
> > c = (l & 0xFF000000) >> 24;
> > putchar(c);
> > c = (l & 0x00FF0000) >> 16;
> > putchar(c);
> > c = (l & 0x0000FF00) >> 8;
> > putchar(c);
> > c = l & 0x000000FF;
> > putchar(c);
> >
> > Is this what you were looking for? I suppose you wanted something
> > simple, ie using printf... I'm not sure about that.
> >
> > printf
> > (
> > "%c%c%c%c",
> > (l & 0xFF000000) >> 24,
> > (l & 0x00FF0000) >> 16,
> > (l & 0x0000FF00) >> 8,
> > l & 0x000000FF
> > );
> > this might be as close as you can get.
> >
> > Shao Zhang wrote:
> > >
> > > But isn't %[Xx] just prints out as Hexdecimal?
> > > I just tried, and it prints out something like: 38c9616e
> > >
> > > which consumes 8 bytes in a file. Given that unsigned long is 32 bits,
> > > I want to use exactly 4 byte to represent it in order to save some
> > > space.
> > >
> > > Thanks.
> > >
> > > Shao.
> > >
> > > Matthew Dalton [EMAIL PROTECTED] wrote:
> > > > Try using %X or %x instead of %ld
> > > >
> > > > Shao Zhang wrote:
> > > > >
> > > > > Hi,
> > > > > If I have an unsigned long int, instead printing out its
> values
> > > > > in string using printf("%ld\n", my_var),
> > > > >
> > > > > I would like to print it out as a 4-byte binary data. Is
> there
> > > > > any easy way to do this in C.
> > > > >
> > > > > Thanks.
> > > > > Shao.
>
> --
> __________________________________________________________________________
> __
> Shao Zhang - Running Debian 2.1 ___ _ _____
> Department of Communications / __| |_ __ _ ___ |_ / |_ __ _ _ _ __
> _
> University of New South Wales \__ \ ' \/ _` / _ \ / /| ' \/ _` | ' \/
> _` |
> Sydney, Australia |___/_||_\__,_\___/
> /___|_||_\__,_|_||_\__, |
> Email: [EMAIL PROTECTED]
> |___/
> __________________________________________________________________________
> ___
>
>
> --
> Unsubscribe? mail -s unsubscribe [EMAIL PROTECTED] <
> /dev/null
>
