HP Prime Programming Tutorial

7/24/2019 HP Prime Programming Tutorial

1/33

HP Prime Programming Tutorial #1: LOCAL, RETURNOver the next month, maybe month and a half, I plan to post programming tutorials for the HP(Hewlett Packard) Prime

If you have programmed with the HP !"#, !$g, or !$gii, this language will be similar to those %he

programming language for the Prime is named the HP Prime Programming &anguage (HPPP)

%hroughout this tutorial, I am going to use the latest version of the software

How to start writing a program'

Press hift * (Program)+ Press ew It is the second touch key! -nter the name of the program Pressing the.&PH.key twice will turn on /PP-01.- 2&PH.3&O14 Pressing .&PH., hift, .&PH. will turn on lowercase alpha3lock %o exit any lock, press the

.&PH. key one more time 5hen happy with the name, press -nter


2/33


3/33

0ules for Program ames'

&etters, numbers, and the underscore character (6) only

+ %he program name must start with a letter

tructure of a HP Prime Program

. HPPP program is encased of an -7PO0% 3 8-#I 3 -9 structure %he layout is generally likethis'

EXPORTprogram_name(arguments)

BEGIN

commands and comments go here

END;

-ach line containing a command generally must end with a semicolon (:) . semicolon can by typeby pressing .&PH. then the Plus key ( * )


4/33

1omments can be typed %he are designated by two forward slashes %he slashes are typed bypressing the 9ivide key ( ; ) .nything in the line following the two slashes is ignored in running theprogram

>s


5/33

-xamples to try with


6/33

5elcome to another programming tutorial for the HP Prime In this session, we will cover J#8O7,IE3%H-3-&-, P0I%, and the EO0 loop

J#8O7

MS"#!$' J#O7 takes a string a makes a pop3up message box Program execution stops untilyou press a key to acknowledge the message

.ccess' 1mds, IAO, " J#8O7

%he program 1OJ&O14' Imagine that you are in charge of setting the combinations for the good,old3school combination locks %his program gives three digit combinations through the use ofJ#8O7

EXPORT COMLOCK()

BEGIN

LOCAL L0;

L0:=RANDINT(3,0,39);**

MSGBOX("SECRET: "+L0(1)+","+L0(2)+","+L0(3));

END;LL %hanks to %homas &ake for pointing out my typo .pologies for any inconvenience 3 -ddie(!A+A+>F)

Other commands that are featured'

0.9I%(n, a, b) generates a list of n integers between a and b Cou can leave n out if you desire asingle random integer Picks may be repeated

%he HP PrimeMs default list variables are designated &> through &$


7/33

Here is a sample output for 1OJ&O14'

IE3%H-3-&-

%&-THEN-ESE' Program structure'IF conditionTHEN

do if the condition is true;

ELSE

do if the condition is false;

END;

.ccess' %mplt, + 8ranch, + IE %H- -&-

%ip' Cou can leave out the -&- part if you only want to test to see if a condition is true .ccess thesimple IE3%H- structure by pressing %mplt, + 8ranch, IE %H-

.ccess N, , @@, etc by pressing hift, ote that the double e?uals is needed to check e?uality


8/33

P0I%

PR%NT' %he P0I% command prints a sting, result, or a combination of both onto the PrimeMs

%erminal screen If P0I% is used, the program will end on the terminal (text output) screen Press abutton to exit

Cou can access the terminal screen at any time by pressing the O button, holding it, and thenpressing the 9ivide ( ; ) button

.ccess' 1mds, IAO, $ P0I%

%ip' %o clear the terminal screen, type P0I%() %his is a good way to clear the terminal screen andI usually use this at the beginning of any program if P0I% is going to be used later on

%he program


9/33

D:=B^2-4*A*C;

IF D?0 THEN

PRINT("Roots are real.");

ELSE

PRINT("Roots are complex.");

END;

PRINT((-B+?D)/(2*A));PRINT((-B-?D)/(2*A));

END;

-xamples'


10/33

Eor strings, 9IJ returns length as a numberEor matrices, 9IJ returns the list Qnumber of rows, number of columnsR

.ccess' 1mds, trings, $ 9IJ

%he program'

EXPORT SUMDIV(N)

BEGIN

LOCAL S:=0,K,mdiv,ldiv;

mdiv:=CAS.idivis(N);

ldiv:=DIM(mdiv);

FOR K FROM 1 TO ldiv(1) DO

S:=S+mdiv(K);

END;

RETURN S;

END;

LL %hanks to %homas &ake for pointing out that the variable =mat=, which I had in this program was

unnecessary 3 -ddie !A+A+>!

-xamples'/J9IK(+) returns +"/J9IK(+F) returns >/J9IK("G) returns >"

HP Prime Programming Tutorial #%: &H"LE, "NPUT, '"LL, REPEAT,

GET'E(

%his tutorial is going to cover a lot, each with some new programming commands in this series Ihope you are ready for the intensity ')

5HI&-, IP/%, 4I&&

HP Prime Program' %.0#-% %.0#-% is a game where you provide a guess to get a desirednumber If you miss, the calculator will tell you if number is higher and lower .t the end of thegame, the calculator gives you how may picks you needed to get the target number

*H%E' 0epeat a number of commands while a specific condition is test

WHILE condition is true DO

commandsEND;

.ccess' %mplt, ! &oop, G 5HI&-

1aution' 5atch your -9sS Jake sure an -9 is with each loop and the program itself Press thesoft key 1heck to check your work

%NPUT' 1reates an input screen for variables On the HP Prime, the input can asked for more than


11/33

one input %.0#-% demonstrates IP/% with one prompt

One Kariable'INPUT(variable, "title", "label", "help text")

Julti3Kariable'INPUT(list of variables, "title", list of "labels", list of "help text")

ote' Pressing 1ancel will store a > in variable Cou may include code of what to do if the userpresses 1ancel, but it is not re?uired

.ccess' 1mds, IAO, G IP/%

+%' %erminates program execution othing dies, I promise

.ccess' %mplt 8lock, ! 4I&&

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;

%ry it and of course, you can adDust the higher limit Here is some thing for you to try with %.0#-%'

.dd a limited amount of guesses+ 1an you display the list of guessesT

0-P-.%

/&.J .lgorithm' take an integer n If n is even, divide it by + If n is odd, multiply it by ! and add /&.J counts how many steps it takes to get n to

REPEAT'


12/33

.ccess' %mplt, ! &oop, 0-P-.%

Eeatured'C!NCATli(t, li(t./' Jelds list and list+ into one

.ccess' %oolbox, Jath, &ist, F 1oncatenate

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;

-xamples'

/&.J(G) returns'

Jessage 8ox' =O OE %-P@=&ist' QG, , ", F, +, R

/&.J(++) returns'Jessage 8ox' =O OE %-P@=&ist' Q++, , !F, , G+, +, !, F>, +>, >, G, , ", F, +, R

#-%4-C

%he next section will introduce a super3important command, #-%4-C 5e will be working with#-%4-C over the entire series

%he Program 4-CO' %he person presses key presses 5hich each key press, the code returns tothe terminal screen %he program terminates when the -nter key is pressed

"ET+E0' 0eturns the key code of last key pressed %he PrimeMs key map is below (Picture is fromthe HP Prime /serMs #uide)

.ccess' 1mds, IAO, F #-%4-C


13/33

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;


14/33

-xample 4ey 1odes'!!' " key+' up' left"' right+' downG>' plusFG' minus

HP Prime Programming Tutorial #): CHOOSE an* CASE, Ti+ aout

"NPUT

5elcome to Part F of our programming series for the Prime %odayMs session will cover 1HOO-and 1.-

Eirst a tip from Han of the JoHP1 Eorum, which is found at http'AAwwwhpmuseumorgAcgi3

sysAcgiwrapAhpmuseumAforumcgiU+GG>"F%hank you Han for allowing me to share this

/se the IE %H- -&- structure with IP/% to execute a set of default instructions if the userpresses cancel IP/% returns a value of > if -1 or cancel is pressed, and if a value is entered

IF INPUT(...) THEN

commands if values are entered

ELSE

commands if Cancel is pressed

END;

9efault values can be assigned to values as an optional fifth argument for IP/%

INPUT(var, "Title", "Prompt", "Help", default value)

%he type of variable maybe set to other than real numbers Vust remember to store such type beforethe IP/% command Eor example, if you want var to be a string, store an empty string'

var:=" ";

.gain, maDor thanks to Han

1HOO- and 1.-

CH!!SE' 1reates a pop up choose box, similar to what you see when you click on a soft menu%here are two syntaxes for 1HOO-'

imple yntax (up to F options)'1HOO-(var, =title string=, =item =, =item +=, , =item n=):

&ist syntax (infinite amount of items)'1HOO-(var, =title string=, Q=item =, =item +=R):

1hoosing item assigns the value of to var, choosing item + assigns the value of + to var

.ccess' 1mds, IAO, 1HOO-
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi#255084http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi#255084http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi#255084http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi#255084http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi#255084


15/33

1.-' .llows for different test cases for one variable .lso includes a default scenario (optional)

CASE

IF test 1 THEN do if true END;

IF test 2 THEN do if true END;

...DEFAULT commands END;

.ccess' 1mds, + 8ranch, ! 1.-

&etMs look at two programs to demonstrate both 1HOO- and 1.-

%-0JK-& 3 %erminal Kelocity of an ObDect

EXPORT TERMVEL()

BEGIN

LOCAL L0:={9.80665,32.174},

L1:={1.225,.0765},L2:={.47,1.05,1.15,.04},C,K,M,A,T;

CHOOSE(C,"Units","SI","English");

CHOOSE(K,"Type of Object","Sphere","Cube",

"Cylinder","Tear-Shaped");

INPUT({M,A},"Object",

{"M=","A="},{"Mass","Surface Area"});

T:=?((2*M*L0(C))/(L1(C)*A*L2(K)));

MSGBOX("Terminal Velocity="+T);RETURN T;

END;

-xamples'

phere, I /nits, J @ >G kg, . @ >>+" mB+%erminal Kelocity' % @ +FF>FG!" mAs

1ube, / /nits, J @ + lb, . @ !F>! ftB+%erminal Kelocity' % @ G!F$"++>$ ftAs

.0-.1 3 .rea of 1ircles, 0ings, and ectors

EXPORT AREAC()

BEGIN

LOCAL C,R,S, ,A;

CHOOSE(C,"Areas","1. Circle","2. Ring","3. Sector");

INPUT(R, "Input Radius", "R =");


16/33

CASE

IF C==1 THEN A:=?*R^2; END;

IF C==2 THEN

INPUT(S,"Small Radius","r=");

A:=?*(R^2-S^2);

END;

IF C==3

INPUT( , "Angle", " =");

\\ Assume you are in the correct angle mode

IF HAngle==1 THEN

\\ Test Angle Mode

:= *?/180;

END;

A:= *R^2/2;

END;

END;

MSGBOX("Area is "+A);

RETURN A;

END;

-xamples

0 @ +G, r @ G, W @ XAF radians or FGY

1ircle' $!F$GF>"F$0ing' +G!>FFector' +FGF!$+>+

HP Prime Programming Tutorial #-: STARTAPP, START."E&, RG

%odayMs session is about starting other apps in a program and using colors

)e1ining e23ation( in t4e Program Editor and Home

%he e?uation must be a string and be stored to the appropriate designated variable

EU is for functions of 7 (Eunction app)

0U is for polar functions of W (Polar app)

/U is for se?uences of , 3, 3+ (e?uence app)

7U and CU for parametric e?uations of % (Parametric .pp)

KU for open statements and e?uations in the .dvanced #raphing .pp, which %he independent

variables are 7 and C


17/33

U is a digit >3$

9efining e?uations this way leaves them uncheck If you want them plotted or accessed in um

Kiew, you will need to check them

-xample'E'@=+L7B!= stores the function f(x) @ +LxB! in Eunction

0G'@=.LI(W)= stores the polar function r(W) @ .Lsin(W) in Polar Eunction G, with . being what value

stored in it

STARTAPP

%.0%.PP(application name in quotes):

tarts the named .pp %he calculator points the screen to the default view (Plot, ymb, um)

.ccess' 1mds, F .pp Eunctions, + %.0%.PP

CHEC+and UNCHEC+

1hecks and unchecks specific e?uation or function (>3$) in the current app Eor example, if you are

in the Eunction app, 1H-14() activates E .s you should expect, /1H-14() turns E off

5hat does 1H-14 and /1H-14 affectT

5hether a function is plotted in Plot view

+ 5hether a function is analyZed in um view

.ccess for 1H-14' 1mds, F .pp Eunctions, 1H-14

.ccess for /1H-14' 1mds, F .pp Eunctions, F /1H-14

START5%E*

Instructs the HP Prime to go to a certain view It has two arguments, the view number and a redraw

number

1ommon view numbers include (not all inclusive)'

3+ @ Jodes screen

3 @ Home

> @ ymbolic (ymb)

@ Plot

+ @ umeric (um)

! @ ymbolic etup

F @ Plot etup


18/33

G @ umeric etup

@ .pp Information

@ %he Kiews 4ey

" @ first special view

$ @ second special view

-tc

%he redraw number is either > or non3Zero > does not redraw the screen, anything else does I

recommend the latter

yntax' %.0%KI-5(view number, redraw number)

.ccess' 1mds, F .pp Eunctions, ! %.0%KI-5

R"#

0eturns an integer code pertaining to a colorMs 0#8 code %his is super useful for drawing and text

writing

yntax' 0#8(red, green, blue, alpha)

0ed' Intensity of 0ed, >3+GG

#reen' Intensity of #reen, >3+GG

8lue' Intensity of 8lue, >3+GG

.lpha' (optional) Opacity (up to +")

0#8 codes'

8lue' 0#8(>,>,+GG)

Kiolet' 0#8(F!,+GG,>)

9ark #reen' 0#8(>,+",>)

Orange' 0#8(+GG,+,>)

Cellow' 0#8(>,+GG,+GG)

0ed' 0#8(+GG,>,>)

5hite' 0#8(+GG,+GG,+GG)

8lack' 0#8(>,>,>)

#ray' 0#8(+$,+",+")

8rown' 0#8(G>,G,>)

&ight 8lue' 0#8(!,+,!!>)

Eor other colors, 0#8 can be found on various sites on the Internet, including 5ikipedia

.ccess' 1mds, + 9rawing, G 0#8

%ip' 1hange a color of a graph


19/33

/se the syntax

EU(1O&O0)'@0#8(red,blue,green,[alpha\):

E stands for the designated function type (E for function, 0 for polar, etc)

U is the digit >3$

-xample'

E"(1O&O0)'@0#8(>,>,+GG)

makes the function E" plot in blue

%his is a lot, but this is doable &etMs see all these commands and tips in action and create somemagic

1onic 9rawing for HP Prime

9raws the conic section for the general e?uation

.xB+ * 8yB+ * 1xy * 9x * -y * E @ >

Cou can choose the color how the conic section is plotted, from red, blue, orange, and green

(#ame show enthusiasts take note of the order of the colors I listed :) )

EXPORT CONIC()

BEGIN

LOCAL cr, cg, cb, I;INPUT({A,B,C,D,E,F},

"Ax^2+By^2+Cxy+Dx+Ey+F", { }, { },

{0,0,0,0,0,0});

// Colors

CHOOSE(I, "Choose a Color",

"Red","Blue","Orange","Green");

cr:={255,0,255,0};

cg:={0,0,127,255};

cb:={0,255,0,0};

STARTAPP("Advanced Graphing");

V1:="A*X^2+B*Y^2+C*X*Y+D*X+E*Y+F=0";

V1(COLOR):=RGB(cr(I),cg(I),cb(I));

CHECK(1);

// Plot View

STARTVIEW(1,1);

END;


20/33

8elow are some examples 0emember the form'

.xB+ * 8yB+ * 1xy * 9x * -y * E @ >


21/33


22/33

ProDectile Jotion for HP Prime

%his program calculates range and height of a proDectile, and plots its path %he program sets the

mode into 9egrees (H.ngle@) and the calculator to the Parametric app

-?uations'

x @ K L cos W L t

y @ K L sin W L t 3 G L g L tB+

5here

K @ initial velocity

W @ initial degree of flight

g @ -arth gravitation constant ($">G mAsB+, ]!+F>F ftAsB+)

.ir resistance is not factored, so we are dealing with idealconditions How much the proDectile

represents reality varies, where factors include the obDect being proDected, the temperate and

pressure of the air, and the weather

EXPORT PROJ13()

BEGIN

LOCAL M, str;

// V, G, are global

// Degrees


23/33

HAngle:=1;

CHOOSE(M, "Units", "SI", "US");

IF M==1 THEN

str:="m";

G:=9.80665;

ELSE

str:="ft";

G:=32.17404;

END;

INPUT({V, }, "Data",

{"V:"," :"},

{"Initial Velocity in "+str+"/s",

"Initial Angle in Degrees"});

X1:="V*COS( )*T";

Y1:="V*SIN( )*T-.5*G*T^2";

STARTAPP("Parametric");

CHECK(1);

// Adjust Window

Xmin:=0

// Range

Xmax:=V^2/G*SIN(2* );

Ymin:=0

// Height

Ymax:=(V^2*SIN( )^2)/(2*G);

MSGBOX("Range: "+Xmax+" "+str+", "

+", Height: "+Ymax+" "+str);

// Plot View

STARTVIEW(1,1);

END;

8elow are screen shots from an example with K @ !G+G mAs and W @ F"Y


24/33

HP Prime Programming Tutorial #/: Suroutine0S3bro3tine(


25/33

%his session will show how routines work in HPP& #enerally, subroutines have bedeclared beforethe main program 9eclaration is important %he details of the subroutinesare afterthe main program

9efinitely take a look at the example programs to get a better understanding

/8 0outines for HP Prime

#eneral yntax'

sub(); //declare subroutines

EXPORT main()

BEGIN

commands go here, including sub()

END;

sub()

BEGIN

commands go here

END;

/8-7.J

%his is Dust a demonstration of how sub routines work %his program calculates one of two values'

If . is positive, then the program evaluates . If not, the program values 8 instead 5here'

. @ +(x3y)A^ * xy8 @ ^B+

and ^ @ +eB(x*y) 3 eB(x3y) 3 eB(y3x)

5e will use ^ as the subroutine

SUB1();

EXPORT SUBEXAM(X,Y)

BEGIN

LOCAL A, B;

A:=(2*(Y-X))/SUB1(X,Y)+X*Y;

B:=(SUB1(X,Y))^2;

IF A>B THEN

RETURN A;

ELSE

RETURN B;

END;

END;

SUB1(X,Y)

BEGIN

RETURN 2*e^(X+Y)-e^(X-Y)-e^(Y-X);

END;


26/33

-xamples'

/8-7.J(3F, ) returns +$$"$""$/8-7.J(+,!) returns "+"!+$$F/8-7.J(3G,3) returns !>F">+""/8-7.J(+,3!) returns +">>FF

9ays 8etween 9ates

99.C /sing ubroutines for HP Prime' 8est for $> to +>$$

L 0emember century years not divisible by F>> are O% leap years %his program does not takethis into account If any such years are passed, subtract one day for such year manually

ource' HP +1 Janual 3 Hewlett Packard

// Declare Subroutines

SUB1();

SUB2();

SUB3();

// Main program

EXPORT DDAYS(m1,d1,y1,m2,d2,y2)

BEGIN

// DYS HP 12C

LOCAL x1, x2, z1, z2;

x1:=SUB1(m1); x2:=SUB1(m2);

z1:=SUB2(m1,y1); z2:=SUB2(m2,y2);

RETURN SUB3(y2,m2,d2,z2,x2)-

SUB3(y1,m1,d1,z1,x1);

END;

SUB1(X)BEGIN

IF X?2 THEN

RETURN 0;

ELSE

RETURN IP(.4*X+2.3);

END;

END;

SUB2(X,Y)

BEGIN

IF X?2 THEN

RETURN Y-1;

ELSERETURN Y;

END;

END;

SUB3(Y,M,D,Z,X)

BEGIN

RETURN 365*Y+31*(M-1)+D+IP(Z/4)-X;

END;


27/33

(%hanks to Owitte for pointing out my typo)

-xamples'9ays 8etween 9ates'

A!A$"G to +A+"A$$G is !,G+ days

!AFA$ to AA+>! is !,!$ days

+A>A+>> to A!>A+>F is ,+$" days

AGA+>G to !A$A+++ returns ,G> 8/% this program treats +>> and ++>> as leap years, whichin reality they are not ubtract + to get the correct answer of ,G>F days

HP Prime Programming Tutorial #: TE!TOUT#reetings everyone It has been too long since I last posted I hope everyone had a fantastic%hanksgiving Eor those of you who are battling cold and stormy weather, please be safe Eor those

of you living in the outhern Hemisphere where summer is about to begin IMm DealousS ') I lovesummer

%ntrod3ction

O4 this section we will start covering some of the graphics features of the HP Prime Programming&anguage 5e touched on graphics a bit when we used %.0%.PP and %.0%KI-5 to call up thePlot screen of certain apps (Eunction, Parametric, Polar, .dvanced #rpahing)

%his time we are going to use drawing commands that can be used in any HP Prime app In asense we are creating a graphic obDect (#0O8) %he HP Prime allows for ten graphic obDects,named #> 3 #$ Eor this tutorial series, (unless specified) I am always going to use the default#0O8, #> %his makes typing commands much easier

1artesian vs Pixel

-ach graphic obDect operates in either one of two coordinate systems' 1artesian and pixel If youworked with the Hewlett Packard HP !$gii calculator, this might look familiar to you

%he features of the 1artesian system (x,y) are these'

L %he end points depend on the Plot variables 7min, 7max, Cmin, and CmaxL %he system is familiar, having x increasing as we move to the right and y increasing as we moveup (no shocker there)L %he trade is that some (very few) drawing commands donMt accommodate the 1artesian system

.n example is the .01 command, which re?uires the radius to be in pixels

8elow is a map of the 1artesian system'


28/33

%he Pixel ystem (x,y)'

L %he boundaries are 1ixed %he pixel (>,>) is the top left hand corner, the pixel (!", +") is thelower right hand cornerL %he value of x still increases as we go to the right However, y increases as we go down, oppositeof the 1artesian system On the other hand, x and y are always non3negative


29/33

%he 9rawing 1ommands

%he HP Prime has two sets of drawing commands' one for the 1artesian system and one for thePixel system .ll commands for the Pixel system will have a =6P= suffix attached Eor example'

&I- draws a line using 1artesian coordinates, while &I-6P draws a line using Pixel coordinates

#eneral .ccess' (in the Programming -ditor)

9rawing 1ommands for the Pixel system' 1mds, + 9rawing, Pixels9rawing 1ommands for the 1artesian system' 1mds, + 9rawing, 1art_sian

1learing the #0O8 screen

%o clear the #0O8 screen, we will simply type RECT() %he wipes the screen, leaving it white It is

necessary to do this at least at the beginning of each program containing drawing commands In asense, RECT()is similar to PRINT()

Hint' %o paint an entire screen a specific color, use RECT(color)

howing the #raphics creen

It is not enough to type the drawing commands 5e need a command to tell the HP Prime to showthe graphics %wo ways to do it are'

&REE6E' %his does exactly what it says, freeZes the screen %o exit, tap the screen or press -1


30/33


31/33

TEXTOUT(text, x, y)

TEXTOUT_P(text, x, y)

1olored text at a set font siZe'TEXTOUT(text, x, y, size code, color)

TEXTOUT_P(text, x, y, size code, color)

5ith all this, we finally get to some programming ince it is 9ecember, and snowing in a lot of thenorthern side of -arth, letMs use %-7%O/%6P to draw snowflakes I am going to use symboliZe thesnowflake by the asterisk, the symbol of multiplication in programming [ ` \ types L

O5E&.4-

O5E&.4- takes one argument, which is the number of snowflakes to be drawn

ote' %ake note the order of the commands %he order regarding where to draw and generaterandom numbers is important to get the results you want

Program'

EXPORT SNOWFLAKE(N)

BEGIN

LOCAL X,Y,Z,I,L0;

L0:={RGB(0,0,255),RGB(178,255,255),

RGB(30,144,255),RGB(0,255,255)};

\\ blue, light blue, dodger blue, cyan

RECT();

FOR I FROM 1 TO N DO

X:=RANDINT(0,304); \\ save some room since text takes pixels

Y:=RANDINT(0,208);Z:=RANDINT(1,4);

Z:=L0(Z);

TEXTOUT_P("*",X,Y,2,Z);

END;

FREEZE;

END;


32/33


33/33

Documents

HP Prime Programming Tutorial