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Section 8: Program Editing 126
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instructions. If you specify a delete number that extends across
the END of a program, the HP-41C only deletes
up to the END of the program and stops. If
you attempt to delete more lines than you have allocated, the
calculator simply deletes lines up to the end of program memory or
an END instruction and stops.
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Let’s load a program into program memory and use the editing
features to modify it.
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To determine the heat loss from a cylindrical water heater, you need
to know three things: the area of the cylinder, the convective heat
transfer coefficient, and the temperature difference between the cylinder
surface and the surrounding air. In the
introduction
to this handbook, you wrote a program (HEAT) that determined the heat
loss from the water heater given the area, the heat transfer coefficient,
and the temperature difference. In
section 7,
you wrote a program called CIRCLE to determine the surface area of one
end of the cylinder.
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Now let’s write and load
a program that determines the
total surface area of the cylinder
given its height (h) and radius (r).
The formula used is
S = (2 π r2) +
(2 π r h). Below are the
instructions for the program, assuming
that the radius and the height have
been placed into the X- and Y-registers
of the stack, respectively. The name
of the program is AREA.
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