HP HP-18C - Doing Arithmetic Inside Registers; Keys

Doing Arithmetic Inside Registers
The HP-18C lets you do arithmetic on numbers in registers. The fol-
lowing example stores 45.7 in register 3, multiplies that number by
2.5, and stores the result back in register 3:
Keys: Display:
45.7 1 STO 13
45.713
2.51sT0103
2.513
114 . 25
Description:
Stores 45.7 into register
3.
Stores 114.25
(45.7 x 2.5)
into register 3.
Displays
the contents of
register 3.
Table 2-1. Arithmetic in Registers
Keys New Number in Register
1 sTOI[B
old number + displayed number
ISTOI[J
old number - displayed number
1 STO 10
old number x displayed number
1 STO IC±J
old number -7- displayed number
1 STO I .LJ
old number " displayed number
You can also do arithmetic on numbers stored in variables. For exam-
ple, 2 1 STO 10 .. (in the MU%C menu) multiplies the current
contents of M%C by 2 and stores the product in M%C.
2: Arithmetic 41