Mail Archives: djgpp/1994/10/05/21:31:01
On Tue, 4 Oct 1994, Don L. wrote:
> On 28 Sep 1994, Brian Acton wrote:
>
> > Hello All,
> >
> > I'm compiling with the flags "-mno-486"
> >
> > The lines of code that appear to generate the floating point exception are:
> >
> > int i;
> Off hand I don't know what the "-mno-486" flag does but by ANSI C
> definitions, an signed integer as you have declared "i" to be; has the
> maximum and minimum values of -32,767 to 32,767. You want to declare "i"
WRONG! These are the minimally accepted values for signed integers.
DJGPP, and any other TRUE 32 bit compiler, uses 32 bit integers.
Summary: type 32-bit compiler 16-bit compiler
char 8 bits 8 bits
short 16 bits 16-bits
int 32 bits 16-bits
long 32 bits 32-bits
As you can see, the only real difference is the size of a 'int'. If you
want to assume a 16-bit range, use short instead (I havn't come accross a
compiler in which short was NOT 16 bits, but there's always a possibility).
Generally, shorts are 16 bits, longs 32 bits, and ints whatever fits into
a standard register for the system. Regular DOS compilers only use the
low 16 bits of the 386+'s 32 bit registers, DJGPP uses the full 32bits,
hence the difference.
> as a unsigned int ( now i can be from 0 to 65000 ) or a unsinged long or
> long int which gives you 4 million for the unsigned long or +/- 2million
> for the signed long int.
>
Fred Reimer
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