Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!gatech!bloom-beacon!primerd!hobbiton!fieland
From: fieland@hobbiton.prime.com
Newsgroups: comp.lang.c
Subject: Re: floating point constants
Message-ID: <192700001@hobbiton>
Date: 27 Jul 89 15:08:00 GMT
References: <1925@arisia.Xerox.COM>
Lines: 33
Nf-ID: #R:arisia.Xerox.COM:-192500:hobbiton:192700001:000:573
Nf-From: hobbiton.prime.com!fieland    Jul 27 11:08:00 1989


According to K. & R., if the second operand of the division operator
is zero, the result is undefined.  Therefore, the compiler is free
to do what it wants with this.


On a more practical note, the following program will cause the sun 386i 
cc compiler to print out Inf, -Inf, and -Nan: (sic)

/* This should print out
        inf
        -inf
        NaN
*/

main()
{float f1, f2, f3, f4 = 0;
	f1 = 1.0/f4;
	f2 = -1.0/f4;
	f3 = 0.0/f4;
	
        printf("%f\n",f1); 
        printf("%f\n", f2); 
	
        printf("%f\n", f3);
}




Peggy Fieland

fieland@primerd.prime.com