User Guide

Chapter 16: Programming 275
Chapter 16:
Programming
Getting Started: Volume of a Cylinder
Getting Started is a fast-paced introduction. Read the chapter for details.
A program is a set of commands that the TI-84 Plus executes sequentially, as if you had entered
them from the keyboard. Create a program that prompts for the radius R and the height H of a
cylinder and then computes its volume.
1. Press  ~ ~ to display the
PRGM NEW menu.
2. Press Í to select
1:Create New. The Name=
prompt is displayed, and alpha-lock is on. Press
C
Y L I N D E R
, and then press Í to name the
program
CYLINDER.
You are now in the program editor. The colon (
: )
in the first column of the second line indicates the
beginning of a command line.
3. Press  ~
2 to select 2:Prompt from the
PRGM I/O menu. Prompt is copied to the command
line. Press ƒ
R ¢ ƒ H to enter the
variable names for radius and height. Press
Í.
4. Press y B ƒ
R ¡ ƒ H ¿ ƒ V
Í to enter the expression pR
2
H and store it to
the variable
V.
5. Press  ~
3 to select 3:Disp from the
PRGM I/O menu. Disp is pasted to the command
line. Press y 7
[ã] V O L U M E O I S [ã]
ƒ ¢ ƒ
V Í to set up the program to
display the text
VOLUME IS on one line and the
calculated value of
V on the next.
6. Press y 5 to display the home screen.