HP 39gII User manual

HP Prime Graphing Calculator
HP Prime Tutorial Series, by Edward Shore and Klaas Kuperus: #1
The Tutorial Series
This is the third issue of a series of tutorials for the HP
Prime, written by Edward Shore. This tutorial is going
to cover a lot, each with some new programming
commands. I hope you are ready for the intensity! If
you have programmed with the HP 39g, 39g or 39gII,
you will recognize the programming as the HP Prime
programming language (HPPP) is similar. We are using
the latest firmware in this series, available on the
website.
How to start?
1. Press Shift + 1 (Program).
2. Press New. It is the second touch key.
3. Enter the name of the program. Pressing the ALPHA key twice will turn on
UPPERCASE ΑLPHA-LOCK. Pressing ALPHA, Shift, ALPHA will turn on lowercase
alpha-lock. To exit any lock, press the ALPHA key one more time. When you’re happy
with the name, press Enter.
Rules for Program Names:
1. Letters, numbers, and the underscore character (_) only.
2. The program name must start with a letter.
Structure of a HP Prime Program
A HPPP program is encased of an EXPORT - BEGIN - END structure. The layout is
generally like this:
EXPORT program_name(arguments)
BEGIN
commands and comments go here
END;
Each line containing a command generally must end with a semicolon (;). A
semicolon can by type by pressing ALPHA then the Plus key ( + ).
Comments can be typed. They are designated by two forward slashes. The slashes
are typed by pressing the Divide key ( ÷ ). Anything in the line following the two
slashes is ignored in running the program.
Visit our dedicated HP Prime portal:
http://www.hp-prime.com

HP Prime Tutorial Series, by Edward Shore and Klaas Kuperus: #1
WHILE, INPUT, KILL
HP Prime Program: TARGET. TARGET is a game where you provide a guess to get a
desired number. If you miss, the calculator will tell you if number is higher and lower.
At the end of the game, the calculator gives you how may picks you needed to get
the target number.
WHILE: Repeat a number of commands while a specific condition is test.
WHILE condition is true DO
commands
END;
Access: Tmplt, 3. Loop, 5. WHILE
Caution: Watch your ENDs! Make sure an END is with each loop and the program
itself. Press the soft key Check to check your work.
INPUT: Creates an input screen for variables. On the HP Prime, the input can asked
for more than one input. TARGET demonstrates INPUT with one prompt.
One Variable:
INPUT(variable, "title", "label", "help text")
Multi-Variable:
INPUT(list of variables, "title", list of "labels", list
of "help text")
Note: Pressing Cancel will store a 0 in variable. You may include code of what to do if
the user presses Cancel, but it is not required.
Access: Cmds, 6. I/O, 5. INPUT
KILL: Terminates program execution. Nothing dies, I promise.
Access: Tmplt. 1. Block, 3. KILL
Program:
EXPORT TARGET()
BEGIN
LOCAL C:=0, N:=RANDINT(1,20), G:=-1;
WHILE G≠N DO
C:=C+1;
INPUT(G,"Guess?","GUESS:","1 - 20");
IF G==0 THEN
KILL;
END;
IF G < N THEN
MSGBOX("Higher");
END;
IF G > N THEN
MSGBOX("Lower");
END;
END;
MSGBOX("Correct! Score: "+C);
END;
Try it and of course, you can adjust the higher
limit. Here is something for you to try with
TARGET:
1. Add a limited amount of guesses.
2. Can you display the list of guesses?

HP Prime Tutorial Series, by Edward Shore and Klaas Kuperus: #1
WHILE, INPUT, KILL
HP Prime Program: TARGET. TARGET is a game where you provide a guess to get a
desired number. If you miss, the calculator will tell you if number is higher and lower.
At the end of the game, the calculator gives you how may picks you needed to get
the target number.
ULAM Algorithm: take an integer n. If n is even, divide it by 2. If n is odd, multiply it by
3 and add 1. ULAM counts how many steps it takes to get n to 1.
REPEAT:
Access: Tmplt, 3. Loop, 6. REPEAT
Featured:
CONCAT(list1, list2): Melds list1 and list2 into one.
Access: Toolbox, Math, 6. List, 4. Concatenate
EXPORT ULAM(N)
BEGIN
LOCAL C:=1, L0:={N};
REPEAT
IF FP(N/2)==0 THEN
N:=N/2;
ELSE
N:=3*N+1;
END;
C:=C+1;
L0:=CONCAT(L0,{N});
UNTIL N==1;
MSGBOX("NO. OF STEPS="+C);
RETURN L0;
END;
Examples:
ULAM(5) returns:
Message Box: "NO. OF STEPS=6"
List: {5, 16, 8, 4, 2, 1}
ULAM(22) returns:
Message Box: "NO. OF STEPS=16"
List: {22, 11, 34, 17, 52, 26, 13, 40, 20, 10, 5, 16, 8,
4, 2, 1}

HP Prime Tutorial Series, by Edward Shore and Klaas Kuperus: #1
GETKEY
The next section will introduce a super-important command, GETKEY. We will be
working with GETKEY over the entire series.
The Program KEYNO: The person presses key presses. Which each key press, the
code returns to the terminal screen. The program terminates when the Enter key is
pressed.
GETKEY: Returns the key code of last key pressed. The Prime's key map is below.
(Picture is from the HP Prime User's Guide)
Access: Cmds, 6. I/O, 4. GETKEY
EXPORT KEYNO()
BEGIN
LOCAL K;
PRINT();
PRINT("Press any key to get its code.");
PRINT("Press Enter to exit.");
REPEAT
K:=GETKEY;
IF K ≥ 0 THEN
PRINT(K);
END;
UNTIL K==30;
END;
Example Key Codes:
33: 8 key
2: up
7: left
8: right
12: down
50: plus
45: minus

HP Prime Tutorial Series, by Edward Shore and Klaas Kuperus: #1