Programming

Programs on the Classic Graphing 84

Where programs live on the Classic Graphing 84, and how to create, edit, run and stop them.

Open in Trident

The Classic Graphing 84 has a program memory. A program is a list of lines that the calculator carries out in order, using commands such as Input, Disp, If, For and Menu(. Each line is the kind of thing you could also type on the home screen.

The PRGM key opens three tabs: EXEC runs a program, EDIT changes one, and NEW creates one. Inside the program editor the same key opens the command menus instead: CTL (If, For, While, Menu( and more), I/O (Input, Prompt, Disp, getKey, ClrHome) and EXEC (call another program).

Not every Classic model has program memory. The Classic Scientific 30 and Classic Financial II do not. The Classic CAS model uses Define instead.

1. Create: press PRGM, press the left arrow to reach NEW, and choose Create New. Letters are locked on, so type a name of up to eight characters (a letter first) and press ENTER.
2. Write: in the editor each line starts with a colon. Type an expression or pick a command from PRGM (CTL or I/O), then press ENTER for a new line. Arrow keys move between lines, DEL deletes and CLEAR empties a line.
3. Leave the editor with 2nd, MODE (QUIT). Every change is already saved.
4. Run: press PRGM, pick the program on the EXEC tab so prgmNAME is pasted on the home screen, then press ENTER. Done appears when it finishes. Press ENTER again to run it once more.
5. Stop a running program with ON. You see ERR:BREAK; choose Quit to go home or Goto to jump to the line where it stopped.
6. Edit later: press PRGM, press the right arrow to the EDIT tab and pick the program by name.
7. Programs can also be moved in and out of the app as text or tokenized files. See the import and export guide.

Tips

• Choosing NEW with a name that already exists opens that program for editing instead of replacing it.
• Test a program with small, easy numbers first, so you can see mistakes quickly.
• Variables (A to Z, θ, lists, strings) are shared with the home screen, so a program can read values you stored before and leave results behind.

Related guides

• Create your first program with NEWMake a program called HELLO that shows a message, then run it from the EXEC tab.
• Ask for numbers with Prompt and InputWrite programs that ask for values while they run and then Disp a result.
• Repeat steps with a For loopAdd the whole numbers from 1 to 100 with For( and End, and show the total 5050.
• Make decisions with If, Then and ElseWrite a program that tells you whether a number is negative, using If, Then, Else and End.
• Menus and key presses: Menu( and getKeyLet the user pick from a menu with Menu( and Lbl, or react to single key presses with a getKey loop.
• Import and export programsCopy programs between the app and files: text for every model, and tokenized files for the Classic Graphing 84.