larssjogreen / calkul Goto Github PK

Evaluates the top element on the stack
If simple datatype, doesn't do anything

Asks current UserInterface to pop top element on stack and visualize it.

First version:
Numbers, few operators. Buttons for all. Enter button. Off button.

root is square root (inverse to sqr)
^ is x to the power of y
xroot is the x root of y

UserInterfaces can support datatypes by implementing visualizers

The != operator is missing

The arguments involved in the operation should be stored somewhere so that they can be restored in case of an exception in the operation.

This operator should also work with other datatypes, for example booleans and strings.

How to recreate

2000000 ! -> program freeze. No exception thrown?

Add variables and persistence

It would be nice if we added a character datatype that could be both a number and a character so you could for example add a char and a double.

'a' 5 +   [Output -> 102]

'a' in ascii is number 97

sqr -> sq