Percentage Functions - HP 12C Platinum Owner's Handbook Manual

170 Appendix A: RPN and the Stack
ddition Subtraction Multiplication Division
When an arithmetic operation or q is performed, the answer is placed in the
X-register, the number formerly in the X-register is copied into the LAST X reg-
ister, and the stack drops. When the stack drops, the number in the Z-register is
copied into the Y-register, and the number in the T-register is copied into the Z-
register but also remains in the T-register.
The diagram on the next page illustrates the stack operation when 8 ÷ 2 is calcu-
lated. (Assume that the stack and LAST X registers have already been loaded
with the numbers shown as the result of previous calculations.)
lost lost
eys

Percentage Functions

When any of the three percentage functions is performed, the answer is placed in
the X-register, the number formerly in the X-register is copied into the LAST X
register, but the stack does not drop. The numbers in the Y-, Z-, and T-registers
are not changed when a percentage function is performed.