HP HP-16C User Manual

52 Section 4: Arithmetic and Bit Manipulation Functions
Bit Summation
Pressing 9] (number of bits) sums the bits in the X-register
and returns that value to the X-register. The bit pattern is saved in
the LAST X register. No stack lift occurs. (In word sizes 1 and 2,
the result must be interpreted in Unsigned mode.)
““Double’’ Functions
The HP-16C provides several “double” functions: [DBLX] (double
multiply), (double divide), and (double remainder).
These functions allow the exact calculation of a product double the
given word size and the exact calculation of a quotient and
remainder from a dividend of double word size.
The double functions are most useful in Binary mode. To obtain
meaningful double numbers as results in Hexadecimal and Octal
modes, the word boundary (which is based on the number of bits)
must not “split” a digit. Therefore, you should specify a compatible
word size: a multiple of four in Hex mode and a multiple of three in
Octal mode.*
Double Multiply
The function multiplies two single-word quantities in the
X-and Y-registers to yield a double-word result in the X- and Y-
registers. (The stack does not drop.) The result is right-justified,
with the least significant bits returned in the Y-register and the
most significant bits returned in the X-register.
The stack contents during this operation are shown below. The
stack is filled with the values t, z, y, and x, each register holding
one word.
T t
Z z
Y multiplicand ~xy || product
X
multiplier
xy...
|[
(high
order
bits
in
X)
Keys (o])(0BLX]
* Section 7 (Programming Basics) includes a program for using with Decimal mode.
Refer to page 78.

HP HP-16C Specifications

General

Brand	HP
Model	HP-16C
Category	Desktop
Language	English