Detect number entry on HP-35s?

[Dieter]

(02-26-2015 05:03 AM)mbrethen Wrote:  I checked the manual and whether the user enters a number or not, the current contents of the variable is placed in the x-register.

Sure – that's how the method works! In my sample code the variable (here A) initially holds the vector [row, column] which is displayed as the user is prompted for input. If nothing is entered, there still is this vector stored in A.

(02-26-2015 05:03 AM)mbrethen Wrote:  Testing the vector isn't a viable method.

The method is fine. I just do not (yet) know of a way to implement it on a 35s. ;-)

Dieter