Chapter 3, Problem 5PA

Program Plan Intro

Simple Line Editor

Program Plan:

• A linked list which containing the nodes of type string is used to store the lines of the line editor.
• Each line of the editor is saved in the each nodes of the linked list sequentially.
• The line editor will start with a command “EDIT”, the word followed by the “EDIT” command will treated as the file name.
• The command “I” is used to insert in the editor.
  • If the command “I” is followed by a number, the next line will save at that specific line.
  • If the insert comment “I” does not follow by any numbers, the next line will insert in the current position.
• The command “D” is used to delete the lines from the editor.
  • If “D” is not followed by any numbers, then current line will be deleted.
  • If “D” is followed by one number, the line at that specific number will be deleted.
  • If “D” is followed by two numbers, then all the lines between those lines will be deleted.
• The command “L” is used to list the lines as the delete does.
• The command “A” will append the next line inserted to all the existing lines.
• The command “E” is used to save the lines to a text file and exit the editor.