Need to save SP in higher language

[Mikey2520]

the add command cannot be implemented because there's no way to let the @ function point to the address specified in SP. However I don't want to initiate an int stored in my Java class to store SP because I have to update it every time for almost any commands while updating the real SP. This method is both time and memory inefficient and very awkward, at least from my perspective. So what should I do?

[cadet1620]

Glucocorticoid wrote

there's no way to let the @ function point to the address specified in SP.

The address in SP is just like the data in a variable.  To load variable X into the D register, you would use

    @X
    D=M

To get the address in SP into the A register, do the same thing using SP and A instead of X and D.

--Mark

[Mikey2520]

Thank you so much!!!!!
You helped me make a breakthrough!

[Mikey2520]

So the mechanism in this is that A is specifies the index of M.