HP 15c - Manual (Page 25)

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 ! to calculate the Gamma function, Γ(x), used in
advanced mathematics and statistics. Pressing ´ ! calculates Γ(x + 1),
so you must subtract 1 from your initial operand to get Γ(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 Calculates 8! or Γ(9).
3.9
¤ 1.9748
12.3
| x 151.2900