Inline Editor

The interpreter editor has a command line interface. You can use it to modify and run your programs, or if you prefer, you may use an external editor to create or modify them.

Usign an external editor, program files can be saved in ASCII format and at a later time, executed using nuBASIC interpreter, for example by using the command:
  
nubasic -eThe program you created.BAS

An advanced editor which is part of an Integrated Development Environment for Windows, able to recognize the nuBASIC syntax, is also provided.

Using the interpreter editor you can edit or debug nuBASIC program lines as you enter them, or after they have been saved in a program file.

You can make changes to the information in a line by positioning the cursor where the change is to be made, and by doing one of the following:

  • Typing over the characters that are already there by pressing the INS key on the number pad.

  • Deleting characters to the left of the cursor, using the BACKSPACE key.

  • Deleting characters at the cursor position using the DEL key on the number pad.

  • Inserting characters at the cursor position. This moves the characters following the cursor to the right making room for the new information.

  • Adding to or truncating characters at the end of the program line.

  • Recalling commands, using UP and DOWN keys

  • Clearing current command line using ESC key

  • Displaying command history using F7 key (Windows only)

  • Clearing command history using Alt+F7 keys (Windows only).

  • Searching for command beginning with <chars> by typing <chars> and pressing F8 key (Windows only)

  • Selecting a command by number using F9 key (Windows only)

If you have changed a line, press Return and the modified line will be stored in the proper numerical sequence depending on number you have assigned to the line.

To modify an existing line, you may recall it using UP or DOWN keys and typing modification directly on the line text, then pressing ENTER you will store it.

If you don’t specify a line number, the statement will be executed immediately after pressing Return and will not be stored in the program.

Example:

For i%=1 to 10: Print "Count ";i%;" "; : Next


Output:
Count 1 Count 2 Count 3 Count 4 Count 5 Count 6 Count 7 Count 8 Count 9 Count 10


Editing existing files

After you have entered your program and saved it, you may discover that you need to make some changes. 

To make these modifications, use the List statement to display the program lines that are affected:

  • Reload the program using Load command. 
  • Type the List command. 
  • Type the line number, or range of numbers, to be edited.

Example:


Load “parabola.bas”
Ok.

list -100

10 Cls
20 Line 400,0, 400, 800, &hff
30 Line 0,300, 800, 300, &hff
40 Line 0,0,0,1, &hff
50 old_x = 0
60 old_y = 0
70 x = -400
80 y=(x^3)/300
90 If y>600 Then End
100 y%=300-y

Ok.
80 y=x*x/30
90 If y>600000 Then End

list 80-100

80 y=x*x/30
90 If y>600000 Then End
100 y%=300-y

Ok.


See also Line numbering.

Subpages (1): Line numbering
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