Division by Zero questions?

[Dr. Megabyte]

The following questions relate to the following short "C" program:

main()
{
        float x;
        float y;

        y = 0;
        x = 5/y;
        printf("%f \n",x);
}

On my AT&T 3b2/400 with SYS V R2.04, the program dumps core at the line with
the division and prints the message:"Floating Point Exception - Core dumped".
This seemed reasonable to me. The I tried the same program on my Zilog Model
31 running Zeus 3.21, which is a SYS III port and the program did NOT dump
core. When it got to the printf statement it printed "INF" Which I assume
must mean "Is Not Float". I can find no documentation on this, though if I 
change the floats above to ints, the Zilog prints "NAN" as the result.

Now, I feel the AT&T is doing the correct thing. The question is what in the
world is my Zilog doing, and where do those "NAN" and "INF" messages come from
on the printf statements.

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-- 
UUCP:	(1) seismo!why_not!scsnet!sunder		Mark E. Sunderlin
	(2) ihnp4!chinet!megabyte			aka Dr. Megabyte
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