Owner's manual

Section 2: Numeric Functions 25
Keystrokes
Display
123.4567 |‘
123.0000
|K “ |‘
-123.0000
Reversing the sign does
not alter digits.
|K ´q
-0.4567
1.23456789 “
|&
-1.2346
´ CLEAR u
(release)
1234600000
Temporarily displays all
-1.2346
digits in the mantissa.
|a
1.2346
One-Number Functions
One-number math functions in the HP-15C operate only upon the number in
the display (X-register).
General Functions
Reciprocal. Pressing ∕ calculates the reciprocal of the number in the
display.
Factorial and Gamma. Pressing ´ ! calculates the factorial of the
displayed value, where x is an integer 0x69.
You can also use !      (x), used in
advanced mathematics and statistics. Pressing ´ ! x + 1),
x). For the Gamma
function, x is not restricted to nonnegative integers.
Square Root. Pressing ¤ calculates the positive square root of the
number in the display.
Squaring. Pressing | x calculates the square of the number in the
display.
Keystrokes
Display
25 ∕
0.0400
8 ´ !
40,320.0000

3.9 ¤
1.9748
12.3 | x
151.2900