Casio fx-5800P - Manual (Page 107)

E-106
The following are the formulas for determining the surface area (S) and volume (V) of a
regular octahedron when the length of one side (A) is known.
S = 2
'
3 A
2
, V =
2
3
'
A
3
The following program prompts for input of A and then outputs S and V in accordance with
the above programs.
"A" ?
→ A
2 Ч
'(3) Ч A 2
^
'(2) ч 3 Ч A 3
• Specify COMP as the run mode for the program, and assign the fi le name “OCTAHEDRON”.
Operation Procedure
1. Press
N5(PROG) to enter the PROG Mode.
• This displays the Program Menu screen.
2. Press
1(NEW).
• This displays the fi le name input screen, and automatically
alpha-lock the calculator’s keyboard (
1S).
3. Enter up to 12 characters for the fi le name and then press
E.
• This registers the fi le name and displays the run mode selection screen.
5(O)$(C)2(T)i(A))(H)c(E)s(D)
/(R)5(O)4(N)E
4. Press the number key that corresponds to the mode you want to assign as the program’s
run mode.
• Here, press
1(COMP). This selects COMP as the run mode, and displays the
program editing screen.
Important!
A run mode can be assigned only when you are creating a new program. You cannot
change the run mode of a program once it has been assigned.
5. Input the program.
• Here we will input the program shown below.
S!(")Si(A)S!(")
z3(PROG) 1(?)z3(PROG) 2(→ )Si(A)E
2*!3)*Si(A)x1x(^)
!2)/3*Si(A)63)
• Pressing
E inputs a newline symbol ( _).