20050501
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
2
S = 3 A
2
,V = –––– A
3
12
A
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