20060301
Modifying an Existing Program to Create a New One
You can use the procedure described below to recall an existing program, modify it, and then
run the result as a new program. This helps reduce key input requirements.
The following shows how to modify the “OCTA” program we created on page 12-2-1 to
handle tetrahedrons.
Example: To create a program named “TETRA” that calculates the surface areas (cm
2
) and
volumes (cm
3
) of three regular tetrahedrons, the lengths of whose sides are 7, 10,
and 15 cm
The following formulas calculate the surface area S and volume V of a
regular tetrahedron for which the length of one side A is known.
The following is the program required for this example.
Length of One Side A ..........Input A
Surface Area S ....................Print approx( (3)
×
A^2)
Volume V ............................Print approx( (2)
÷
12
×
A^3)
The following is the “OCTA” program (page 12-2-1).
Length of One Side A ..........Input A
Surface Area S ....................Print approx(2
×
(3)
×
A^2)
Volume V ............................Print approx( (2)
÷
3
×
A^3)
A comparison of the two programs indicates that the following modifications of the “OCTA”
program will produce a program that performs the calculations required by this example.
• Delete “2
×
” (underlined with a wavy line above).
• Change 3 to 12 (underlined with double lines above).
u
ClassPad Operation
(1) On the application menu, tap
p
.
(2) Tap
~
, or tap [Edit] and then [Open File].
12-3-2
Debugging a Program
S = 3 A
2
, V =
2
12
A
3
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