How to Program a Calculator pt 3: Perfecting a Program

Part 3 of 4. This segment teaches how to expect and correct errors in the calculator program from part 2. This is where to add a lot of "if, then" statements. By the end, the program can solve problems with both the input and the output that can occur in unusual circumstances. In the next segment, I move quickly through the steps of creating a program with menus. A Palaverous Production created by Jeff Green on 5-28-2008.

Helpful site for programming:
http://bgo.netfirms.com/tutorials/index.html

How to Program a Calculator:
1: The Basics
2: Creating a Simple Program
3: Perfecting a Program
4: Making Menus

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[thetechreviewman]

how do i add the arrow?

[AlbatrossNecktie]

@thetechreviewman Use the 'sto' key at the bottom left.

[phantomswordsmen]

how did you get a new line when you were anding the If statement after prompt c?

[AlbatrossNecktie]

@phantomswordsmen Press 2nd+ins (the del button) and then hit enter.  You are inserting an enter.

[donovanfonseca]

How do you delete one program only?

[AlbatrossNecktie]

@donovanfonseca Go to 2nd+mem (it's the plus key), cycle to 2 (memory management / delete), go to 7 (program), and use the delete button on the appropriate program.

[yoshinishi1]

ok so lemme just say this.

yoouuuuu are THE BESTTT!!!!!!!!!!! THIS WAS AN AMAZING SERIES OF VIDEOS

(im commenting here cuz i didnt watch the last one haha)

and i understood how to make a basic program after watching these. that's just amazing.

and so i decided to test myself by making a quadratic formula program by myself

(i know its a simple one but hey im a beginner :P)

and I DID IT. now imma put an if then statement for the square root parts answer is negative.

I LUVV YOU!!! :D

[NICKROX247]

after prompt C press 2nd and ins..

[robobrain10000]

We know that teachers are evil :P lol

[trfbell]

Also, little tip. To display a string on two separate lines without putting a whole new display command, you can say disp, then one string, THEN A COMMA, and then just another string.

[trfbell]

If you still have and use this program, I suggest that you make the following change: for the user entering a decimal then multiply it by a hundred, your if statement executes simply if it is lower than one. Therefore, if your user enters a negative value, either by accident or just to see what will happen, your program will again, fail. I think you should add a bit of humor. Example: if C-0 then disp "don't try to fool me, user. My creator made me error proof! So ha. Put in a positive number p

[jessejames4518]

love the program!! 5stars... can you make one for the TI-89..PLEASE. thanks

[MadK306]

If you don't use the "then" in an "if-then" the segment works for one line

[AbsoluteMathematics]

You seem smart I hope you do computer programming and not just this kid stuff lol, nice videos

[thetechreviewman]

@AlbatrossNecktie thanks i figured that out like a second later :P thanks buddy