Algorithm for entering numbers?

[grsbanks]

(08-12-2019 05:36 AM)Ángel Martin Wrote:  For example, RC+ nn is equivalent to { RCL nn, followed by + } and logically the Rnn value becomes the new "x" before the addition.

My take is that the value in Rnn is still preserved in Rnn after the operation while the value in X that it is added to is lost. The stack can therefore be reconstructed in its original form with [CLX] [LASTX] if the initial value of X is what is saved in LASTx.

Of course, the same could be achieved by following up with RC- nn but you might lose some precision depending on the difference between Rnn's and X's exponents.