Inconsistency

[Joe Horn]

(09-02-2015 11:51 AM)whilealive Wrote:  With the current firmware (2015 6 17 (8151)) I get the following results in CAS-mode:

0/0 = undef
1/0 = +- \infty
sin(0.5)/0 = +Inf

as well as
1/\infty = 0

In each of the first three cases I get a different output. In addition, the second and third result is simply wrong. ...

"Simply wrong": no. Ever since the HP implemented the brand-new IEEE standard for Infinity and Not-a-Number in the HP-71B, HP's most advanced calculators have all returned results like these, because that's what the standard specifies.

Examples on the HP 50g in exact mode:

0/0 --> ? (called NaN on the HP-71, and "undef" on Prime)
1/0 --> Infinity
0.5/0 --> Infinity
1/Infinity --> 0

The IEEE standard (IEEE 754) specifies that division by zero should return infinity: https://en.wikipedia.org/wiki/IEEE_float...n_handling