A bug in the CAS

[wangchong01]

(07-08-2017 08:58 AM)Arno K Wrote:  Well, CAS or not should not matter here, ist a calculator and so has to produce reliable putput.
The problem here seems to be parsing of expressions, if one enters 3rd root of 27*10^-81 it works, but hitting the EEX-key gives a hint, the e is small in the input-line and converted to upper case on parsing, 27e-81 becomes 2.7E-80 without the root.
Arno

I have tried some ways to avoid the ambiguous parsing but it doesn't work at all. I found that other two bugs in the CAS:
1.if you input exact(1e-80), you will get 0. I set the epsilon to 2.2250738585e−308 but got the same result. I think there may be something wrong for the CAS to deal with small numbers.
2. If you input bloc(), you will get 0. But if you then move your cursor to the "bloc" and press Enter, the calculator crashes.