A classic calculator that is suitable for everyone.

1) M＋ = Add the current value to (or from) the stored value in the memory register.
2) M- = subtract the current value to (or from) the stored value in the memory register.
3) MR = Recall the current memory register value.
4) MC = Clear the memory register (set to zero).
5) C/AC = Clear the screen ( set to zero) press it one more time to clear all.
6) Long press the screen result to copy.