HP HP-11C

Section 3: Numeric Functions 43
Example .
To Calculate Keystrokes Display
Fractional portion 123.4567 123.4567
0.4567
Round (Assumes [FIX]4 1.23456789 1.23456789
display setting.) 1.2346
Inspect rounding. (f](Fix)8 1.23460000
Reset to [FIX]4. (f](FIx]4 1.2346
One-Number Functions
The HP-11C’s one-number math functions have the following
characteristics:
e Use the number in the displayed X-register as the argument
for the function.
¢ Replace the number in the displayed X-register with the result
of executing the function.
¢ Do not affect numbers in the Y-, Z-, and T-registers.
General Functions
Reciprocal. Pressing calculates the reciprocal of the number
in the displayed X-register, that is, it divides 1 by the number in the
displayed X-register.
Factorial and Gamma. Pressing calculates the factorial or
Gamma value as follows:
1. Factorial.
When executed with a nonnegative integer n (0 < n < 69) in
the displayed X-register, (x!]calculates the factorial of n, that
is, it calculates the product of the integers from 1 to n.