HP 17bII manual Doing Arithmetic Inside Registers and Variables, Arithmetic in Registers

The sand Rkeys can also be used with variables. For example,

s +(in the MU%C menu) stores the rightmost number from the display into the variable M%C. R +copies the contents of M%C into the calculator line. If there is an expression in the display v(suchnumber.as $)+!), then the recalled number replaces only the last

You do not need to clear storage registers before using them. By storing a number into a register, you overwrite whatever existed there before.

Doing Arithmetic Inside Registers and Variables

You can also do arithmetic inside storage registers.

Keys:	Display:	Description:
45.7 s3	+.&-("	Stores 45.7 in reg. 3.
2.5 s*3	$&.("	Multiplies contents of
		register 3 by 2.5 and stores
		result (114.25) back in
		register 3.
R3	##+&$."	Displays register 3.

Table 2-3. Arithmetic in Registers
Keys	New Register Contents
s+	old register contents + displayed number
s-	old register contents – displayed number
s*	old register contents x displayed number
s/	old register contents ÷ displayed number
s@u	old register contents ^ displayed number

46 2: Arithmetic

File name : 17BII-Plus-Manual-E-PRINT-030709 Print data : 2003/7/11