Storing and recalling CAS quoted expressions

[BruceH]

In the CAS, if I do

Code:

a:='2+2'

does a now store 4 or '2+2'? Is there a way of telling? If the latter, is there a way of recalling the original '2+2' rather than 4?

[nbenm]

(10-21-2018 01:29 PM)BruceH Wrote:  In the CAS, if I do

Code:

a:='2+2'

does a now store 4 or '2+2'? Is there a way of telling? If the latter, is there a way of recalling the original '2+2' rather than 4?

Hi,

I'm not sure but it seems that:
1 - a:='2+2' stores 4
2 - a:="2+2" stores the string 2+2

[Tim Wessman]

I believe any simple evaluations such as basic math will be evaluated by the store operator. Anything more complex will not.

[parisse]

You can control evaluation with the second optional argument of eval.
For example a:='2+2' followed by eval(a,1) will return 2+2, assuming that auto-simplification level is 0.

[BruceH]

Thanks Bernard.