Help adding memory buttons/commands in the calculator

[joelpub]

"Ms : Save number to memory."

What number? Can you point out in your code what number you want to save?

Dean, thanks for trying to help.

It is a calculator. So, I'll press, for example, the buttons 4+4 and = . The result will be 8, right? I want to record the result (whatever it is) to the memory to use later. I'll press the MS button to save the result (8) to memory. Was I clear?

If you try in a real calculator, the MS button save in memory the value that is being shown in the screen and put it back when press M+ (adding) or M- (subtracting). Understand?

Thank you again.