20070201
k Using an Existing Program to Create a New Program
Sometimes you can input a new program by using a program already in memory as a
base. Simply recall the existing program, make the changes you need, and then execute
it.
Example 2 To use the OCTA program (page 8-1-2) to create a program that
calculates the surface area (cm
2
) and volume (cm
3
) of regular
tetrahedrons when the length of one side is 7, 10, and 15 cm
Use TETRA as the fi le name.
The following are the formulas used for calculating surface area S
and volume V of a regular tetrahedron for which the length of one
side A is known.
Use the following key operations when inputting the program.
Length of One Side A ... ! J (PRGM)4 (?)a av (A)6 (g )5 (:)
Surface Area S ............. !x (' )d* av (A)x6 (g )5 (^ )
Volume V ...................... !x (' )c/bc* av (A)M d
Compare this with the program for calculating the surface area and volume of a regular
octahedron.
Length of One Side A ... ! J (PRGM)4 (?)a av (A)6 (g )5 (:)
Surface Area S ............. c* !x (' )d* av (A)x6 (g )5 (^ )
Volume V ...................... !x (' )c/d* av (A)M d
As you can see, you can produce the TETRA program by making the following changes in
the OCTA program.
• Deleting c * (underlined using a wavy line above)
• Changing d to b c (underlined using a solid line above)
AA
S = '3 A
2
, V = A
3
––––
'2
12
S = '3 A
2
, V = A
3
––––
'2
12
8-3-2
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