HP HP-15C - Page 71

Section 6: Programming Basics 71
The program to calculate this information uses these formulas and data:
base area = r
2
.
volume = base area × height =  r
2
h.
surface area = 2 base areas + side area = 2r
2
+ 2rh.
Radius, r
Height, h
Base Area
Volume
Surface Area
2.5cm
8.0 cm
?
?
?
4.0
10.5
?
?
?
4.5
4.0
?
?
?
TOTALS
?
?
?
Method:
1.
Enter an r value into the calculator and save it for other calculations.
Calculate the base area (r
2
), store it for later use, and add the base
area to a register which will hold the sum of all base areas.
2.
Enter h and calculate the volume (r
2
h). Add it to a register to hold
the sum of all volumes.
3.
Recall r. Divide the volume by r and multiply by 2 to yield the side
area. Recall the base area, multiply by 2, and add to the side area to
yield the surface areas. Sum the surface areas in a register.
Do not enter the actual data while writing the program  just provide for
their entry. These values will vary and so will be entered before and/or
during each program run.
Key in the following program to solve the above problem. The display
shows line numbers and keycodes (the row and column location of a key),
which will be explained under Further Information.
Keystrokes
Display
| ¥
000-
Sets calculator to Program
mode (PRGM displayed).
´ CLEAR M
000-
Clears program memory. Starts
at line 000.